IR38164M_技术文档

IR38164

IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Features



Internal LDO allows single 16 V operation

Output Voltage Range: 0.5 V to 0.875*PVin

0.5% accurate Reference Voltage

Intel VR12.5 (Rev 1.5), SVID (Rev 1.7) and VR13 (Rev 1.1) compliant

Enhanced line/load regulation with Feedforward

Frequency programmable by PMBus™ up to 1.5 MHz

Enable input with Voltage Monitoring Capability

Remote Sense Amplifier with True Differential Voltage Sensing

Fast mode I2C and 400 kHz PMBus™ interface for programming, sequencing and margining output voltage,

and for monitoring input voltage, output voltage, output current and temperature.



PMBus™ configurable fault thresholds for input UVLO, output OVP, OCP and thermal shutdown.

Thermally compensated pulse-by-pulse current limit and Hiccup Mode Over Current Protection

Dedicated output voltage sensing for power good indication and over-voltage protection which remains

active even when Enable is low.



Enhanced Pre-Bias Start up

Integrated MOSFET drivers and Bootstrap diode

Operating junction temp: -40 C<Tj<125 C

Thermal Shut Down

PMBus™ Programmable Power Good Output

Small Size 5 mmx 7 mm PQFN

⁰

Pb-Free (RoHS Compliant)

External resistor allows setting up to 16 PMBus™ addresses

Applications



Designed for Intel® single phase power rails requiring SVID communication such as VCCIO and VCMP on

platforms such as VR13HC, VR13 and VR12.5.



Servers and High End Desktop CPU VRs for non-core applications

Telecom & Datacom Applications

Distributed Point of Load Power Architectures

Product validation

Qualified for industrial applications according to the relevant tests of JEDEC47/20/22

Final Datasheet

www.infineon.com

Please read the Important Notice and Warnings at the end of this document

page 1 of 64

V2.2

Feb 6 2019

Description

The IR38164 OptiMOS™ IPOL is an easy to use, fully integrated and highly efficient dc-dc regulator with Intel

SVID and I2C/PMBus™ interfaces. The on-chip PWM controller and co-packaged low duty cycle optimized

MOSFETs make the device a space-efficient solution, providing accurate power delivery for low output voltage

and high current applications that require an Intel SVID interface.

The IR38164 offers programmability of switching frequency, output voltage, and fault/warning thresholds and

fault responses while operating over a wide input range. Providing flexibility as well as system level security in

the event of fault conditions.

The switching frequency is programmable from 500 kHz to 1.5 MHz for an optimum solution.

The on-chip sensors and ADC along with the SVID, I2C and PMBus™ make it easy to monitor and report input

voltage, output voltage, output current and temperature.

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Table of contents

Features ........................................................................................................................................ 1

Applications................................................................................................................................... 1

Product validation.......................................................................................................................... 1

Description .................................................................................................................................... 2

Table of contents............................................................................................................................ 3

1

2

3

4

5

6

7

Ordering information ............................................................................................................. 5

Functional block diagram........................................................................................................ 6

Typical application diagram .................................................................................................... 7

Pin descriptions ..................................................................................................................... 8

Absolute maximum ratings ....................................................................................................10

Electrical specifications .........................................................................................................11

Electrical characteristics........................................................................................................12

8

Typical efficiency and power loss curves..................................................................................18

PV_in= V_in= 12 V, VCC=5 V, F_s= 600 kHz...................................................................................................18

PV_in= V_in= 12 V, VCC (Internal LDO), F_s= 600 kHz..................................................................................19

PV_in= V_in= Vcc = 5 V, F_s= 600 kHz...........................................................................................................20

8.1

8.2

8.3

9

Iout reporting curves (SVID) ...................................................................................................21

Thermal Derating curves........................................................................................................22

Typical application configurations ..........................................................................................23

R_DS(ON)of MOSFETs Over Temperature.......................................................................................25

Typical operating characteristics (-40 °C to +125 °C)..................................................................26

10

11

12

13

14

14.1

14.2

14.3

14.4

14.5

14.6

14.7

Theory of operation...............................................................................................................28

Description ............................................................................................................................................28

Device Power-up and Initialization.......................................................................................................28

IꢀC and PMBUS™ Communication........................................................................................................29

Modes for Setting Output Voltages.......................................................................................................30

Bus Voltage UVLO ..................................................................................................................................33

Pre-Bias startup.....................................................................................................................................34

Soft-Start (Reference DAC ramp)..........................................................................................................34

Operating frequency ............................................................................................................................35

Shutdown ..............................................................................................................................................35

Current Sensing, Telemetry and Over-Current Protection..................................................................36

Current reporting limitation at high operating temperature ..............................................................39

Die temperature sensing, telemetry and thermal shutdown ..............................................................40

Remote voltage sensing........................................................................................................................40

Feed-forward.........................................................................................................................................41

Output voltage sensing, telemetry and faults......................................................................................41

Power Good Output ..............................................................................................................................41

Over-Voltage Protection (OVP) .............................................................................................................43

Minimum On-Time Considerations.......................................................................................................44

Maximum Duty Ratio.............................................................................................................................45

Bootstrap Capacitor..............................................................................................................................45

Intel SVID interface................................................................................................................................46

All Call support ......................................................................................................................................46

VR12.5 operation ...................................................................................................................................46

14.8

14.9

14.10

14.11

14.12

14.13

14.14

14.15

14.16

14.17

14.18

14.19

14.20

14.21

14.22

14.23

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Table of contents

14.24

14.25

14.26

14.27

14.28

VR13 operation ......................................................................................................................................46

Set Work Point.......................................................................................................................................46

Dynamic VID slew rate...........................................................................................................................47

Loop compensation ..............................................................................................................................47

Dynamic VID compensation..................................................................................................................47

15

IꢄC and PMBus™ communication protocols ..............................................................................48

I2C Protocols .........................................................................................................................................48

SMBus/PMBus™ protocols ....................................................................................................................48

Supported PMBus™ commands............................................................................................................51

15.1

15.2

15.3

16

PCB footprint and layout recommendations.............................................................................55

Layout recommendations.....................................................................................................................55

PCB Metal and Component Placement ................................................................................................56

PCB copper and solder resist................................................................................................................56

PCB solder paste stencil........................................................................................................................57

16.1

16.2

16.3

16.4

17

Marking and package information...........................................................................................59

Final production marking .....................................................................................................................59

Early production marking .....................................................................................................................59

Package dimensions .............................................................................................................................60

17.1

17.2

17.3

18

19

Environmental Qualifications .................................................................................................62

References ...........................................................................................................................63

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Ordering information

1

Ordering information

Table 1

Ordering Information

Base Part Number

IR38164

Package Type

Standard Pack Form and Qty

Orderable Part Number

QFN 5 mm x 7 mm

Tape and Reel

4000

IR38164MTRPbF

IR38164

PBF

Lead Free

Tape and Reel

Package Type

TR

M

Figure 1

Package Top View

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Functional block diagram

2

Functional block diagram

VCC

Vin

P1V8

LDO

VLDOref

LDO

LGND

-

OT_Fault

+

UVcc

OC_Fault

BOOT

PVIN

VCC

UVcc

FAULT

CONTROL

UVEN

Fault

COMP

Fault

VDAC2

HDrv

+

-

E/A

HDin

GATE

DRIVE

LOGIC

OV_Fault

FCCM

SW

FB

VCC

LDrv

LDin

Enable

PGND

CONTROL AND FAULT LOGIC

Rso

RS-

PGood

RS+

ISense

TMON

Current Sense

SDA

SCL

SVID Interface, SMBus

Interface,

Logic, Command and Status registers

Temperature

Sense

Salert

Vcc

ADDR

Vsns

SV_ALERT

SV_CLK SV_DIO

Figure 2

Block diagram

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Typical application diagram

3

Typical application diagram

For applications in which Pvin>14V, a 1 ohm resistor is required in series with the boot capacitor.

5.5V <Vin<16V

Optional placeholder for boot resistor.

Default should be 0 ohm

Boot

P1V8

PVin

Enable

Vin

Vo

Vcc/

LDO_out

SW

Vsns

RS+

PGood

RS-

SV_CLK

SV_DIO

RSo

Fb

CPU

serial

bus

SV_ALERT

ADDR

Comp

LGnd

PGnd

Placeholder

for capacitor

Figure 3

IR38164 basic application circuit

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Pin descriptions

4

Pin descriptions

Table 2

Pin descriptions

Pin#

Pin name

Pin description

1

PVIN

Input voltage for power stage. Bypass capacitors between PVin and PGND should

be connected very close to this pin and PGND. Typical applications use four 22 µF

input capacitors and a low ESR, low ESL 0.1 µF decoupling capacitor in a

0603/0402 case size. A 3.3 nF capacitor may also be used in parallel with these

input capacitors to reduce ringing on the SW node.

2

Boot

Supply voltage for high side driver. A 0.1 µF capacitor should be connected from

this pin to the SW pin. It is recommended to provide a placement for a 0 ohm

resistor in series with the capacitor. For applications in which PVin>14 V, a 1 ohm

resistor is required in series with the boot capacitor.

3

4

ENABLE

ADDR

Enable pin to turn the IC on and off.

A resistor should be connected from this pin to LGnd to set the PMBus™ address

offset for the device. It is recommended to provide a placement for a 10 nF

capacitor in parallel with the offset resistor.

5

6

Vsns

FB

Sense pin for OVP and PGood. Typically connected to a local Vout capacitor at the

output of the inductor.

Inverting input to the error amplifier. This pin is connected directly to the output

of the regulator or to the output of the remote sense amplifier, via resistor divider

to set the output voltage and provide feedback to the error amplifier.

Output of error amplifier. An external resistor and capacitor network is typically

connected from this pin to FB to provide loop compensation.

Remote Sense Amplifier Output. When the remote sense amplifier is used, this is

connected to the feedback compensation network

7

8

COMP

RSo

9

10

11

RS-

RS+

PGood

Remote Sense Amplifier input. Connect to ground at the load.

Remote Sense Amplifier input. Connect to output at the load.

Power Good status pin. Output is open drain. Connect a pull up resistor from this

pin to VCC. If the power good voltage needs to be limited to < 500 mV prior power

supply ramps above the VCC UVLO, use a 49.9 kΩ pullup. After VCC UVLO a 4.99 kΩ

pullup will suffice.

12,25 PGND

Power ground. This pin should be connected to the system’s power ground plane.

Bypass capacitors between PVin and PGND should be connected very close to

PVIN pin (pin 1) and this pin.

13

14

15

LGND

Signal ground for internal reference and control circuitry. This should be

connected to the PGnd plane at a quiet location using a single point connection.

SVID CLK line. This is pulled up to VDDIO/VCCIO voltage. It is recommended to

provide a placement for a 0603 resistor between the pin and the pullup resistor.

SVID Data line. This is pulled up to VDDIO/VCCIO voltage. It is recommended to

provide a placement for a 0603 resistor between the pin and the pullup resistor.

SVID Alert line. This is pulled up to VDDIO/VCCIO voltage through a resistor.

SMBus Alert line; open drain SMBALERT# pin. This should be pulled up to 3.3 V-5 V

with a 1 kΩ - 5 kΩ resistor.

SV_CLK

SV_DIO

16

17

SV_ALERT

SAlert#

18

19

SDA

SCL

SMBus data serial input/output line. This should be pulled up to 3.3 V-5 V with a 1

kΩ - 5 kΩ resistor.

SMBus clock line. This should be pulled up to 3.3 V-5 V with a 1 kΩ - 5 kΩ resistor.

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Pin descriptions

Pin#

Pin name

Pin description

20

P1V8

This is the supply for the digital circuits; bypass with a 10 µF capacitor to PGnd.

21

22

Vin

Input Voltage for LDO. A 1 µF capacitor is placed from this pin to PGnd. If the

internal bias LDO is used, tie this pin to PVin. If an external bias voltage (typically 5

V) is available for Vcc, tie the Vin pin to Vcc.

Bias Voltage for IC and driver section, output of LDO. Add 10 µF bypass cap from

this pin to PGnd.

VCC

23,26 NC

24 SW

Do not connect to this pin.

Switch node. This pin is connected to the output inductor.

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Absolute maximum ratings

5

Absolute maximum ratings

Table 3

Absolute maximum ratings

-0.3 V to 25 V

PVin, Vin

-0.3 V to 6 V

Vcc/LDO_Out

P1V8

-0.3 V to 2 V

-0.3 V to 25 V (dc), -4 V to 25 V (ac, 100 ns)

-0.3 V to 31 V

SW

Boot

-0.3 V to 6 V (dc) (Note 1), -0.3 V to 6.5 V (ac, 100 ns)

-0.3 V to 6 V (Note 1)

Boot to SW

PGood, other Input/Output Pins

PGnd to Gnd

-0.3 V to + 0.3 V

Thermal information

Junction to ambient thermal resistance θ_JA

Junction to board thermal resistance θ_JB

Junction to case top thermal resistance θ_JC(top)

Junction to case top thermal parameter Ψ_{JT (top)}

Storage Temperature Range

11.1 C/W (Note 2)

4.16 C/W (Note 3)

18.9 C/W (Note 4)

0.32 C/W (Note 2)

-55 °C to 150 °C

-40 °C to 150 °C

Junction Temperature Range

(Voltage referenced to GND unless otherwise specified)

Attention:

Stresses beyond these listed under ꢀAbsolute Maximum Ratingsꢁ may cause permanent

damage to the device. These are stress ratings only and not functional operation ratings of

the device.

Note: ¹Must not exceed 6 V

²Value obtained via thermal simulation under natural convection on an IR38164 demo board. 10 layer, 7” x

5.5”x0.072” PCB with 1.5 oz copper at the top and bottom layer. Inner layers 2, 3, 8 and 9 have 1 oz copper

and layers 4,5,6,7 have 2 oz copper. T_a= 25 ⁰C was used for the simulation.

³PCB from note 2 and package is considered in thermal simulation with Ta=25 ⁰C. Pin 12 is considered.

⁴Only package is considered. Simulation is used with a cold plate that fixes top of package at Ta=25 ⁰C.

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Electrical specifications

6

Electrical specifications

Table 4

Recommended operating conditions for reliable operation with margin

Input Voltage Range, PVin (Note 4)

Input Voltage Range, Vin

1.5 V to 16 V

5.3 V to 16 V

Supply Voltage Range, Vcc

Supply Voltage Range, Boot to SW

Output Voltage Range

4.5 V to 5.5 V

0.5 V to 0.875 x Vin

0 to 30 A

Output Current Range

Switching Frequency

500 kHz to 1500 kHz

-40 °C to 125 °C

Operating Junction Temperature

(Voltages referenced to GND unless otherwise specified)

Note:

⁴Maximum absolute SW node voltage should not exceed 25 V. A common practice is to have 20%

margin on the maximum SW node voltage in the design. For applications requiring PVin equal to

or above 14 V, a small resistor in series with the Boot pin should be used to ensure the maximum

SW node spike voltage does not exceed 25 V.

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Electrical characteristics

7

Electrical characteristics

Parameter

Symbol

Conditions

Min

Typ

Max Unit

Power Stage

VBoot – Vsw= 5 V, I_O= 30 A,

Tj =25 °C

Top Switch

R_{DS(ON)_Top}

R_{DS(ON)_Bot}

2.2

mΩ

Vcc = 5 V, I_O= 30 A, Tj

=25°C

Bottom Switch

0.78

300

Bootstrap Diode

Forward Voltage

I(Boot) = 40 mA

150

450 mV

I_SW

SW = 0 V, Enable = 0 V

SW=0; Enable= 2 V

1

SW Leakage Current

µA

I_{SW_EN}

18

Supply Voltage

PVin range

(using external Vcc=5 V)

Vin range

1.5-16

5.3-16

V

Fsw=600 kHz

Fsw=1.5 MHz

(using internal LDO)

5.5-16

5.0

4.5

5.5

4

V

Vin range (when Vin=Vcc)

Supply Current

Vin Supply Current

(standby) (internal Vcc)

I_in(Standby)

Enable low, No Switching,

Vin=16 V, low power mode

enabled

2.7

mA

Vin Supply Current

I_in(Dyn)

Enable high, Fs = 600 kHz,

Vin=16 V

Enable low, No Switching,

Vcc=5.5 V, low power mode

enabled

mA

39

50

5

(dynamic) (internal Vcc)

VCC Supply Current

(Standby)(external Vcc)

I_cc(Standby)

2.7

VCC Supply Current

(Dyn)(external Vcc)

I_cc(Dyn)

Enable high, Fs = 600 kHz,

Vcc=5.5 V

39

50 mA

Internal Regulator

VCC\LDO)

Vin(min) = 5.5 V, Io=0 mA,

Cload = 10 µF

4.8

4.5

5.15

4.99

5.4

V

5.2

Output Voltage

VCC

Vin(min) = 5.5 V, Io=70 mA,

Cload = 10 µF

Io=0-70 mA, Cload =10µF,

Vin=5.1 V

VCC Dropout

VCC_drop

I_short

0.7

V

Short Circuit Current

110

mA

Internal Regulator

(P1V8)

Output Voltage

P1V8

Vin(min) = 4.5 V, Io = 0‐1mA 1.795 1.83 1.905

, Cload = 10 µF

V

1.8V UVLO Start

P1V8_UVLO_Start

1.8 V Rising Trip Level

1.66

1.72

1.78

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Electrical characteristics

Parameter

1.8V UVLO Stop

Oscillator

Symbol

P1V8_UVLO_Stop

Conditions

1.8 V Falling Trip Level

Min

1.59

Typ

1.63

Max Unit

1.68

V

0.71

1.84

2.46

0.22

35

PVin=5 V, D=Dmax, Note 2

PVin=12 V, D=Dmax,Note 2

Vramp

Ramp Amplitude

Vp-p

V

PVin=16 V, D=Dmax,Note 2

Note 2

Ramp Offset

Ramp(os)

Tmin(ctrl)

Toff

Note 2

50

150

89

Min Pulse Width

Fixed Off Time

Max Duty Cycle

Error Amplifier

Input Bias Current

Sink Current

ns

%

Note 2 Fs=1.5 MHz

Fs=400 kHz

100

87.5

86

Dmax

-0.5

0.6

8

+0.5

1.8

25

IFb(E/A)

Isink(E/A)

Isource(E/A)

SR

µA

1.1

13

mA

V/µs

MHz

dB

Source Current

Slew Rate

7

12

20

Note 2

20

100

2.8

30

40

Gain-Bandwidth Product GBWP

DC Gain Gain

110

3.9

120

4.3

100

Maximum output Voltage Vmax(E/A)

Minimum output Voltage Vmin(E/A)

Reference Voltage

V

mV

1.25 V<V_FB<2.555 V

VOUT_SCALE_LOOP=1;

-1

+1

0.75 V<VFB<1.25 V

VOUT_SCALE_LOOP=1;

-0.75

+0.75

Accuracy

%

0⁰C<Tj<85⁰C

-0.5

-1.6

+0.5

+1.6

0.45 V<V_FB<0.75 V

VOUT_SCALE_LOOP=1;

1.25 V<V_FB<2.555 V

VOUT_SCALE_LOOP=1;

0.75 V<VFB<1.25 V

VOUT_SCALE_LOOP=1;

-1.0

-2.0

+1.0

+2.0

Accuracy

-40⁰C<Tj<125⁰C

0.45 V<V_FB<0.75 V

VOUT_SCALE_LOOP=1;

Remote Sense Differential Amplifier

Note 2

3

6.4

110

0

MHz

dB

Unity Gain Bandwidth

DC Gain

BW_RS

Gain_RS

Offset_RS

0.5 V<RS+<2.555 V, 4 kΩ

-1.6

1.6

3

Offset Voltage

load

⁰

27 C<Tj<85 C

0.5 V<RS+<2.555 V, 4kΩ

load

mV

-3

⁰

-40 C<Tj<125 C

V_RSO=1.5 V, V_RSP=4 V

11

16

2

mA

V2.2

Source Current

Sink Current

Final Datasheet

Isource_RS

Isink_RS

0.4

1

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Electrical characteristics

Parameter

Symbol

Conditions

Note 2, Cload = 100 pF

Min

2

Typ

Max Unit

Slew Rate

Slew_RS

4

8

V/µs

V_RSO=1.5 V, V_RSP=4 V

11

36

0.5

16

74

1.5

20

mA

Kohm

V

Source Current

Isource_RS

Rin_RS+

RS+ input impedance

55

Note 2

55

1

RS- input impedance

Maximum Voltage

Minimum Voltage

Power Good

Rin_RS-

V(VCC) – V(RS+)

Vmax_RS

Min_RS

4

mV

Power Good High

threshold

Power_Good_High

Power_Good_Low

Vsns rising,

VOUT_SCALE_LOOP=1,

Vout=0.5 V, PMBus™ mode

0.45

0.43

V

Power Good Low

Threshold

Vsns falling,

VOUT_SCALE_LOOP=1,

V

Vout=0.5 V, PMBus™ mode

Power Good High

Threshold Rising Delay

TPDLY

Vsns rising, Vsns >

Power_Good_High

0

ms

Power Good Low

Threshold Falling delay

VPG_low_Dly

PG(voltage)

Vsns falling, Vsns <

Power_Good_Low

150

175

200

0.5

µs

V

Pgood Voltage Low

Ipgood = -5 mA

Under-Voltage Lockout

Vcc-Start Threshold

4.0

3.7

4.2

3.9

0.6

0.4

4.4

4.1

0.65

0.45

1

VCC_UVLO_Start

VCC_UVLO_Stop

Vcc Rising Trip Level

Vcc Falling Trip Level

V

Vcc-Stop Threshold

0.55

0.35

Enable-Start-Threshold

Enable-Stop-Threshold

Enable Leakage Current

Over-Voltage Protection

OVP Trip Threshold

Enable_UVLO_Start EN supply ramping up

Enable_UVLO_Stop EN supply ramping down

V

Ien

Enable = 5.5 V

µA

OVP (trip)

Vsns rising,

VOUT_SCALE_LOOP=1,

Vout=0.5V

0.57 0.605 0.63

V

Vsns falling,

VOUT_SCALE_LOOP=1,

Vout=0.5 V

Vsns rising, Vsns-

OVP(trip)>200 mV

OVP Comparator Delay

OVP Fault Prop Delay

20

30

40

mV

ns

OVP (hyst)

OVP (delay)

200

Over-Curent Protection

OC limit=40, VCC = 5.05 V,

T_j=25 C

34.5

40

44

OC Trip Current

I_TRIP

A

⁰

OCset Current

Temperature coefficient

-40 C to 125 C, VCC=5.05

V, Note 2

5900

20

ppm/°C

ms

OCSET(temp)

Tblk_Hiccup

Hiccup blanking time

Note 2

Over-Temperature

Protection

Thermal Shutdown

Note 2

145

°C

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Electrical characteristics

Parameter

Symbol

Conditions

Min

Typ

Max Unit

Hysteresis

Note 2

25

Input Over-Voltage

Protection

PVin over-voltage

threshold

PVin_OV

22

23.7

25

V

PVin over-voltage

Hysteresis

PVin _{ov hyst}

2.4

Output Voltage

Reporting

Resolution

Vout update rate

N_Vout

Note 2

1/256

31.25

V

kHz

Lowest reported Vout

Vomon_low

Vsns=0V

0

V

VOUT_SCALE_LOOP=1,

Vsns=3.3 V

3.3

V

VOUT_SCALE_LOOP=0.5,

Vsns=3.3 V

6.6

Highest reported Vout

Vomon_high

VOUT_SCALE_LOOP=0.25,

Vsns=3.3 V

13.2

26.4

VOUT_SCALE_LOOP=0.125,

Vsns=3.3 V

⁰

0 C to 85 C,

4.5 V<Vcc<5.5 V,

1 V<Vsns≤ 1.5 V

+/-0.6

VOUT_SCALE_LOOP=1

⁰

0 C to 85 C,

+/-1

4.5 V<Vcc<5.5 V, Vsns> 1.5 V

VOUT_SCALE_LOOP=1

%

Vout reporting accuracy

⁰

0 C to 125 C,

+/-1.5

4.5 V<Vcc<5.5 V, Vsns>0.9 V

VOUT_SCALE_LOOP=1

0⁰C to 125⁰C,

4.5V<Vcc<5.5V,

0.5V<Vsns<0.9V

VOUT_SCALE_LOOP=1

+/-3

Iout Reporting

Resolution

N_Iout

Note 2

1/16

A

Iout update rate

Iout (digital) monitoring

Range

31.25

kHz

0

40

A

⁰

0 C to 125 C,

4.5 V<Vcc<5.5 V,

5 A < Iout <30 A

Iout_dig Accuracy

+/-5

%

I2C/PMBus™ mode

Final Datasheet

15 of 64

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Feb 6 2019

IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Electrical characteristics

Parameter

Symbol

Conditions

Min

Typ

Max Unit

Note 3

Temperature Reporting

Resolution

N_Tmon

Note 2

1

°C

Temperature update rate

31.25

kHz

Temperature Monitoring Tmon_dig

Range

Thermal shutdown

hysteresis

Input Voltage Reporting

-40

150

21

°C

Note 2

25

°C

V

Resolution

N_PVin

1/32

Monitoring Range

PVin update rate

PMBVinmon

0

V

kHz

31.25

⁰

0 C to 85 C

-1.5

1.5

4.5 V<Vcc<5.5V, PVin>10 V

-40⁰C to 125⁰C

4.5 V<Vcc<5.5 V, PVin>14 V

%

Monitoring accuracy

⁰

-40 C to 125 C,

4.5 V<Vcc<5.5 V,

7V<PVin<14 V

-4

4

PMBus™ Interface

Timing Specifications

SMBus Operating

frequency

Bus Free time between

Start and Stop condition

Hold time after

F_SMB

400

kHz

µs

T_BUF

1.3

0.6

T_HD:STA

(Repeated) Start

Condition. After this

period, the first clock is

generated.

µs

Repeated start condition T_SU:STA

setup time

0.6

µs

Stop condition setup

time

T_SU:STO

Data Rising Threshold

Data Falling Threshold

1.339

1.048

1.766

1.495

V

Data Rising Threshold

LVT

0.45

0.7

0.65

0.9

V

Clock Rising Threshold

LVT

Clock Falling Threshold

LVT

0.45

300

0.65

900

Data Hold Time

T_HD:DAT

ns

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Electrical characteristics

Parameter

Symbol

Conditions

Min

100

Typ

Max Unit

ns

Data Setup Time

Data pulldown resistance

T_SU:DAT

8

11

12

16

17

35

Ω

SALERT# pulldown

resistance

9

Ω

Clock low time out

Clock low period

Clock High Period

T_TIMEOUT

T_LOW

25

1.3

0.6

ms

µs

T_HIGH

50

Note:

²Guaranteed by design and not tested in production.

³Guaranteed by statistical correlation, but not tested in production.

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Typical efficiency and power loss curves

8

Typical efficiency and power loss curves

8.1

PV_in= V_in= ꢁꢄ V, VCC=ꢅ V, F_s= ꢂꢆꢆ kHz

PV_in= V_in= 12 V, VCC=5 V (external), Io=0-30 A, Fs= 600 kHz, Room Temperature, No Air Flow. Note that the

efficiency and power loss curves include the losses of IR38164, the inductor losses, the losses of the input and

output capacitors, and PCB trace losses. The table below shows the inductors used for each of the output

voltages in the efficiency measurement.

Table 5

Vout (V)

Inductors for PV_in=V_in=12 V, VCC, F_s= 600 kHz

Lout (µH)

0.15

P/N

Size (mm)

12.4 x 8.3 x 8

12.7 x 13.4 x 8

DCR (m)

0.15

HCB138380D-151 (Delta)

FP1308R3-R32-R (Cooper)

0.8

1.0

1.2

1.5

1.8

3.3

5

0.15

0.32

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Typical efficiency and power loss curves

8.2

PV_in= V_in= ꢁꢄ V, VCC ꢇInternal LDOꢈ, F_s= ꢂꢆꢆ kHz

PVin = Vin = 12 V, Internal LDO, Io=0-30 A, Fs= 600 kHz, Room Temperature, No Air Flow. Note that the efficiency

and power loss curves include the losses of IR38164, the inductor losses, the losses of the input and output

capacitors, and PCB trace losses. The table below shows the inductors used for each of the output voltages in

the efficiency measurement.

Table 6

Vout (V)

Inductors for PV_in=V_in=12 V, Internal LDO, F_s= 600 kHz

Lout (µH)

0.15

P/N

Size (mm)

12.4 x 8.3 x 8

12.7 x 13.4 x 8

DCR (m)

0.15

HCB138380D-151 (Delta)

FP1308R3-R32-R (Cooper)

0.8

1.0

1.2

1.5

1.8

3.3

5

0.15

0.32

Final Datasheet

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Feb 6 2019

IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Typical efficiency and power loss curves

8.3

PV_in= V_in= Vcc = ꢅ V, F_s= ꢂꢆꢆ kHz

PVin = Vin = VCC = 5 V, Io=0-30 A, Fs= 600 kHz, Room Temperature, No Air Flow. Note that the efficiency and

power loss curves include the losses of IR38164, the inductor losses, the losses of the input and output

capacitors and PCB trace losses. The table below shows the inductors used for each of the output voltages in

the efficiency measurement.

Table 7

Vout (V)

Inductors for PV_in=V_in=Vcc=5 V, F_s= 600 kHz

Lout (µH)

0.1

P/N

Size (mm)

12.4 x 8.3 x 8

DCR (m)

0.15

HCB138380D-101 (Delta)

HCB138380D-151 (Delta)

0.8

1.0

1.2

1.5

1.8

0.1

0.15

Final Datasheet

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Feb 6 2019

IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Iout reporting curves (SVID)

9

Iout reporting curves ꢇSVIDꢈ

An Intel VRTT tool was used on a 38164 demo board running at 978 kHz to collect SVID Iout reporting data. This

is shown on Figure 4 and Figure 5.

25

20

15

10

NTC 0.03 Max Limit (6%)

NTC 0.03 Min Limit (6%)

5

0

5

10

15

20

25

Iout (A)

Figure 4

SVID readings from 37 units. Intel DCR 7%, NTC 3% spec.

25

20

15

10

5

Max Sweep

Min Sweep

Max Limit NTC 0.03 (6%)

Min Limit NTC 0.03 (6%)

0

5

10

15

20

25

-5

Iout (A)

Figure 5

Final Datasheet

SVID readings for the min and max gain. Intel DCR 7%, NTC 3% spec.

21 of 64

V2.2

Feb 6 2019

IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Thermal Derating curves

10

Thermal Derating curves

The measurements were done on an IR38164 demo board. The PCB is ꢁ.ꢂꢃ x ꢄ.ꢄꢃ x ꢂ.ꢂꢁꢀꢃ with 10-layers, FR4

material and 2 oz. copper.

IR38164 Thermal Derating Curves)

PVin=12V, Vout=1V, Fsw=978kHz

31

29

27

25

23

0 LFM

200 LFM

400 LFM

21

19

17

15

25

30

35

40

45

50

55

60

65

70

75

80

85

TAmb (˚C)

Figure 6

PV_in= 12 V, V_out=1 V, Vcc = Internal LDO, F_s= 978 kHz

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Typical application configurations

11

Typical application configurations

For applications in which Pvin>14V, a 1 ohm resistor is required in series with the boot capacitor.

5.5V <Vin<16V

Optional placeholder for boot resistor.

Default should be 0 ohm

Boot

P1V8

PVin

Enable

Vin

Vo

Vcc/

LDO_out

SW

Vsns

RS+

PGood

RS-

SV_CLK

SV_DIO

RSo

Fb

CPU

serial

bus

SV_ALERT

ADDR

Comp

LGnd

PGnd

Placeholder

for capacitor

Figure 7

Using the internal LDO, Vo < 2.555 V

For applications in which Pvin>14V, a 1 ohm resistor is required in series with the boot capacitor.

5.5V <Vin<16V

Optional placeholder for boot resistor.

Default should be 0 ohm

Boot

P1V8

PVin

Enable

Vin

Vo

Vcc/

LDO_out

SW

Vsns

RS+

PGood

R2

PGood

RS-

SV_CLK

SV_DIO

CPU

serial

bus

RSo

Fb

Recommend R2=499 ohm

SV_ALERT

Comp

LGnd

ADDR

PGnd

Placeholder

for capacitor

Figure 8

Using the internal LDO, Vo > 2.555 V

Final Datasheet

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V2.2

Feb 6 2019

IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Typical application configurations

For applications in which Pvin>14V, a 1 ohm resistor is required in series with the boot capacitor.

1.5V <PVin<16V

Optional placeholder for boot resistor.

Default should be 0 ohm

Boot

P1V8

PVin

Enable

Vin

Vcc=5V

PGood

Vo

Vcc/

LDO_out

SW

Vsns

RS+

PGood

RS-

SV_CLK

SV_DIO

CPU

serial

bus

RSo

Fb

SV_ALERT

Comp

LGnd

ADDR

PGnd

Placeholder

for capacitor

Figure 9

Using external Vcc, Vo<2.555 V

PVin=Vin=Vcc= 5V

Optional placeholder for boot resistor.

Default should be 0 ohm

Boot

P1V8

PVin

Enable

Vin

Vo

Vcc/

LDO_out

SW

Vsns

RS+

PGood

RS-

SV_CLK

SV_DIO

RSo

Fb

CPU

serial

bus

SV_ALERT

ADDR

Comp

LGnd

PGnd

Placeholder

for capacitor

Figure 10

Single 5 V application, Vo<2.555 V

Final Datasheet

24 of 64

V2.2

Feb 6 2019

IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

RDS(ON) of MOSFETs Over Temperature

12

R_DSꢇONꢈof MOSFETs Over Temperature

Figure 11

R_DS(on)of MOSFETs over Temperature

Final Datasheet

25 of 64

V2.2

Feb 6 2019

IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Typical operating characteristics (-40 C to +125 C)

13

Typical operating characteristics ꢇ-ꢃꢆ °C to +ꢁꢄꢅ °Cꢈ

Figure 12

Typical operating characteristics (set 1 of 2)

Final Datasheet

26 of 64

V2.2

Feb 6 2019

IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Typical operating characteristics (-40 C to +125 C)

Figure 13

Typical operating characteristics (set 2of 2)

Final Datasheet

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V2.2

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Theory of operation

14

Theory of operation

14.1

Description

The IR38164 is a 30 A rated synchronous buck converter that supports PMBus™ and I2C digital interfaces

respectively. This device is Intel SVID compliant and can support VR12.5 as well as VR13. It uses an externally

compensated fast, analog, PWM voltage mode control scheme to provide good noise immunity as well as fast

dynamic response in a wide variety of applications. At the same time, the digital communication interfaces

allow complete configurability of output setting and fault functions, as well as telemetry.

The switching frequency is programmable from 500 kHz to 1.5 MHz and provides the capability of optimizing

the design in terms of size and performance.

The IR38164 provides precisely regulated output voltages from 0.5 V to 0.875*PVin programmed via two

external resistors or through the communication interfaces. They operate with an internal bias supply (LDO),

typically 5.2 V. This allows operation with a single supply. The output of this LDO is brought out at the Vcc pin

and must be bypassed to the system power ground with a 10 µF decoupling capacitor. The Vcc pin may also be

connected to the Vin pin, and an external Vcc supply between 4.5 V and 5.5 V may be used, allowing an

extended operating bus voltage (PVin) range from 1.5 V to 16 V.

The device utilizes the on-resistance of the low side MOSFET (synchronous MOSFET) as the current sense

element. This method enhances the converter’s efficiency and reduces cost by eliminating the need for external

current sense components.

The IR38164 includes two low RDS(ONꢅ MOSFETs using Infineon’s OptiMOS^TMtechnology. These are specifically

designed for low duty cycle, high efficiency applications.

14.2

Device Power-up and Initialization

During the power-up sequence, when Vin is brought up, the internal LDO converts it to a regulated 5.2 V at Vcc.

There is another LDO which further converts this down to 1.8 V to supply the internal digital circuitry. An under-

voltage lockout circuit monitors the voltage of VCC pin and the P1V8 pin, and holds the Power-on-reset (POR)

low until these voltages exceed their thresholds and the internal 48 MHz oscillator is stable. When the device

comes out of reset, it initializes a multiple times programmable (MTP) memory load cycle, where the contents

of the MTP are loaded into the working registers. Once the registers are loaded from MTP, the designer can use

PMBus™ commands to re-configure the various parameters to suit the specific VR design requirements if

desired, irrespective of the status of Enable.

The typical default configuration utilizes the internal LDO to supply the VCC rail when PVin is brought up. For

this configuration power conversion is enabled only when the Enable pin voltage exceeds its under-voltage

threshold, the PVin bus voltage exceeds its under-voltage threshold, the contents of the MTP have been fully

loaded into the working registers and the device address has been read. The initialization sequence is shown in

Figure 14. Another common default configuration uses an external power supply for the VCC rail. While in this

configuration it is recommended to ensure the VCC rail reaches its target voltage prior the enable signal goes

high.

Additional options are available to enable the device power conversion through software and these options

may be configured to override the default by using the I2C interface or PMBus™. For further details, see the

UN0075 IR3816x PMBus™ commandset user note.

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Theory of operation

PVIN=VIN

VCC

P1V8

UVOK

clkrdy

POR

Initialization

done

Enable

Vout

Figure 14 Initialization sequence showing PVin, Vin, Vcc, 1.8V, Enable and Vout signals as well as the

internal logic signals

14.3

IꢄC and PMBUS™ Communication

All the devices in this family have two 7-bit registers that are used to set the base I2C address and base PMBus™

address of the device, as shown below in Table 8 .

Table 8

Register

Registers used to set device base address

Description

I2c_address[6:0]

The chip I2C address. An address

of 0 will disable I2C

communication. Note that

disabling I2C does not disable

PMBus™.

PMBus™_address[6:0]

The chip PMBus™ address. An

address of 0 will disable PMBus™

communication. Note that

disabling PMBus™ does not

disable I2C.

In addition, a resistor may be connected between the ADDR and LGND pins to set an offset from the default

preconfigured I2C address (0x10) /PMBus™ address (0x40) in the MTP. Up to 16 different offsets can be set,

allowing 16 devices with unique addresses in a single system. This offset, and hence, the device address, is read

by the internal 10-bit ADC during the initialization sequence.

Table 9 below provides the resistor values needed to set the 16 offsets from the base address.

*Do not use these values for applications with ambient temperatures <0°C.

Table 9

Address offset vs External Resistor(R_ADDR)

ADDR Resistor (Ohm)

Address Offset

499

+0

+1

+2

+3

+4

+5

+6

1050

1540

2050

2610

3240

3830

Final Datasheet

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V2.2

Feb 6 2019

IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Theory of operation

ADDR Resistor (Ohm)

Address Offset

4530

5230

+7

+8

6040

+9

6980

7870

8870

9760

10700

>11800

+10

+11

+12

+13

+14

+15

The device will then respond to I2C/PMBus™ commands sent to this address. There is also a register bit

i2c_disable_addr_offset that may be set in order to instruct the device to ignore the resistor offset for both I2C

and PMBus™. If this bit is set, the device will always respond to commands sent to the base address. For

applications with junction temperatures below 0°C, offsets +0, +1, and +2 are not available.

14.4

Modes for Setting Output Voltages

These devices provide a configuration bit that allows the user to choose between PMBus™ and SVID modes.

When this bit is set, SVID mode, the output voltage will ramp to the configured boot voltage and subsequently,

respond to voltage set commands issued by the CPU on the Serial VID (SVID) interface. The VID tables for 5 mV

and 10 mV VID steps are shown in the tables below. A VID code of 0 corresponds to 0 V as well as the regulator

shutdown code in SVID mode. Vboot which is utilized in the SVID mode should not be set to 0 V as this will

shutdown the regulator. When this bit is zero, the regulation is determined by the output voltage set by the

PMBus™ commands. It should be noted that irrespective of the mode used to set the output voltage, telemetry

information always remains available on both the communications busses.

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Theory of operation

Table 10

Intel 5 mV VID table

VID

Voltage

VID

Voltage

VID

Voltage

(V)

VID

Voltage

(V)

VID

Voltage

(V)

(Hex)

(V)

(Hex)

(V)

(Hex)

FF

FE

FD

FC

FB

FA

F9

F8

F7

F6

F5

F4

F3

F2

F1

F0

EF

EE

ED

EC

EB

EA

E9

E8

E7

E6

E5

E4

E3

E2

E1

E0

DF

DE

DD

DC

DB

DA

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

CF

CE

CD

CC

CB

CA

C9

C8

C7

C6

1.52

C5

C4

C3

C2

C1

C0

BF

BE

BD

BC

BB

BA

B9

B8

B7

B6

BB

BA

B9

B8

B7

B6

B5

B4

B3

B2

B1

B0

AF

AE

AD

AC

AB

AA

A9

A8

A7

A6

A5

A4

A3

A2

A1

A0

9F

9E

9D

9C

9B

9A

99

98

97

96

95

94

93

92

1.23

91

90

8F

8E

8D

8C

8B

8A

89

88

87

86

85

84

83

82

81

80

7F

7E

7D

7C

7B

7A

79

78

77

76

75

74

73

72

71

70

6F

6E

6D

6C

6B

6A

69

68

67

66

65

64

63

62

61

60

5F

5E

5D

5C

5B

5A

59

58

0.97

0.965

0.96

57

56

55

54

53

52

51

50

4F

4E

4D

4C

4B

4A

49

48

47

58

57

56

55

54

53

52

51

50

4F

4E

4D

4C

4B

4A

49

48

47

46

45

44

43

42

41

40

3F

3E

3D

3C

3B

3A

39

38

37

36

35

34

33

32

31

30

0.68

0.675

0.67

2F

2E

2D

2C

2B

2A

29

28

27

26

25

24

23

22

21

20

1F

1E

1D

1C

1B

1A

19

18

17

16

15

14

13

12

11

10

0F

0E

0D

0C

0B

0A

09

08

07

06

05

04

03

02

01

00

0.48

0.475

0.47

0.465

0.46

0.455

0.45

0.445

0.44

0.435

0.43

0.425

0.42

0.415

0.41

0.405

0.4

1.515

1.51

1.505

1.5

1.495

1.49

1.485

1.48

1.475

1.47

1.465

1.46

1.455

1.45

1.445

1.44

1.435

1.43

1.425

1.42

1.415

1.41

1.405

1.4

1.395

1.39

1.385

1.38

1.375

1.37

1.365

1.36

1.355

1.35

1.345

1.34

1.335

1.33

1.325

1.32

1.315

1.31

1.305

1.3

1.295

1.29

1.285

1.28

1.275

1.27

1.265

1.26

1.255

1.25

1.245

1.24

1.235

1.225

1.22

1.215

1.21

1.205

1.2

1.195

1.19

1.185

1.18

1.175

1.17

1.165

1.16

1.155

1.18

1.175

1.17

1.165

1.16

1.155

1.15

1.145

1.14

1.135

1.13

1.125

1.12

1.115

1.11

1.105

1.1

1.095

1.09

1.085

1.08

1.075

1.07

1.065

1.06

1.055

1.05

1.045

1.04

1.035

1.03

1.025

1.02

1.015

1.01

1.005

1

0.995

0.99

0.985

0.98

0.975

0.955

0.95

0.945

0.94

0.935

0.93

0.925

0.92

0.915

0.91

0.905

0.9

0.895

0.89

0.885

0.88

0.875

0.87

0.865

0.86

0.855

0.85

0.845

0.84

0.835

0.83

0.825

0.82

0.815

0.81

0.805

0.8

0.795

0.79

0.785

0.78

0.775

0.77

0.765

0.76

0.755

0.75

0.745

0.74

0.735

0.73

0.725

0.72

0.715

0.71

0.705

0.7

0.695

0.69

0.685

0.665

0.66

0.655

0.65

0.645

0.64

0.635

0.63

0.625

0.62

0.615

0.61

0.605

0.6

0.685

0.68

0.675

0.67

0.665

0.66

0.655

0.65

0.645

0.64

0.635

0.63

0.625

0.62

0.615

0.61

0.605

0.6

0.595

0.59

0.585

0.58

0.575

0.57

0.565

0.56

0.555

0.55

0.545

0.54

0.535

0.53

0.525

0.52

0.515

0.51

0.505

0.5

0.495

0.49

0.485

N/A

Final Datasheet

31 of 64

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Theory of operation

Table 11

Intel 10 mV VID table

VID

Voltage

VID

Voltage

VID

Voltage

(V)

VID

Voltage

(V)

VID

Voltage

(V)

(Hex)

(V)

(Hex)

(V)

(Hex)

FF

FE

FD

FC

FB

FA

F9

F8

F7

F6

F5

F4

F3

F2

F1

F0

EF

EE

ED

EC

EB

EA

E9

E8

E7

E6

E5

E4

E3

E2

E1

E0

DF

DE

DD

DC

DB

DA

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

CF

CE

CD

CC

CB

CA

C9

C8

C7

C6

3.04

3.03

3.02

3.01

3.00

2.99

2.98

2.97

2.96

2.95

2.94

2.93

2.92

2.91

2.90

2.89

2.88

2.87

2.86

2.85

2.84

2.83

2.82

2.81

2.80

2.79

2.78

2.77

2.76

2.75

2.74

2.73

2.72

2.71

2.70

2.69

2.68

2.67

2.66

2.65

2.64

2.63

2.62

2.61

2.60

2.59

2.58

2.57

2.56

2.55

2.54

2.53

2.52

2.51

2.50

2.49

2.48

2.47

C5

C4

C3

C2

C1

C0

BF

BE

BD

BC

BB

BA

B9

B8

B7

B6

B5

B4

B3

B2

B1

B0

AF

AE

AD

AC

AB

AA

A9

A8

A7

A6

A5

A4

A3

A2

A1

A0

9F

9E

9D

9C

9B

9A

99

98

97

96

95

94

93

92

91

90

8F

8E

8D

8C

2.46

2.45

2.44

2.43

2.42

2.41

2.40

2.39

2.38

2.37

2.36

2.35

2.34

2.33

2.32

2.31

2.30

2.29

2.28

2.27

2.26

2.25

2.24

2.23

2.22

2.21

2.20

2.19

2.18

2.17

2.16

2.15

2.14

2.13

2.12

2.11

2.10

2.09

2.08

2.07

2.06

2.05

2.04

2.03

2.02

2.01

2.00

1.99

1.98

1.97

1.96

1.95

1.94

1.93

1.92

1.91

1.90

1.89

8B

8A

89

88

87

86

85

84

83

82

81

80

7F

7E

7D

7C

7B

7A

79

78

77

76

75

74

73

72

71

70

6F

6E

6D

6C

6B

6A

69

68

67

66

65

64

63

62

61

60

5F

5E

5D

5C

5B

5A

59

58

57

56

55

54

53

52

1.88

1.87

1.86

1.85

1.84

1.83

1.82

1.81

1.80

1.79

1.78

1.77

1.76

1.75

1.74

1.73

1.72

1.71

1.70

1.69

1.68

1.67

1.66

1.65

1.64

1.63

1.62

1.61

1.60

1.59

1.58

1.57

1.56

1.55

1.54

1.53

1.52

1.51

1.50

1.49

1.48

1.47

1.46

1.45

1.44

1.43

1.42

1.41

1.40

1.39

1.38

1.37

1.36

1.35

1.34

1.33

1.32

1.31

51

50

4F

4E

4D

4C

4B

4A

49

48

47

46

45

44

43

42

41

40

3F

3E

3D

3C

3B

3A

39

38

37

36

35

34

33

32

31

30

2F

2E

2D

2C

2B

2A

29

28

27

26

25

24

23

22

21

20

1F

1E

1D

1C

1B

1A

19

18

1.30

1.29

1.28

1.27

1.26

1.25

1.24

1.23

1.22

1.21

1.20

1.19

1.18

1.17

1.16

1.15

1.14

1.13

1.12

1.11

1.10

1.09

1.08

1.07

1.06

1.05

1.04

1.03

1.02

1.01

1.00

0.99

0.98

0.97

0.96

0.95

0.94

0.93

0.92

0.91

0.90

0.89

0.88

0.87

0.86

0.85

0.84

0.83

0.82

0.81

0.80

0.79

0.78

0.77

0.76

0.75

0.74

0.73

17

16

15

14

13

12

11

10

0F

0E

0D

0C

0B

0A

09

08

07

06

05

04

03

02

01

0.72

0.71

0.70

0.69

0.68

0.67

0.66

0.65

0.64

0.63

0.62

0.61

0.60

0.59

0.58

0.57

0.56

0.55

0.54

0.53

0.52

0.51

0.50

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Theory of operation

14.5

Bus Voltage UVLO

If the input to the Enable pin is derived from the bus voltage by a suitably programmed resistive divider, it can

be ensured that the device does not turn on until the bus voltage reaches the desired level as shown in Figure

15. Only after the bus voltage reaches or exceeds this level and voltage at the Enable pin exceeds its threshold

(typically 0.6 V) will the device be enabled. Therefore, in addition to being logic input pin to enable the

converter, the Enable feature, with its precise threshold, also allows the user to override the default 8 V under-

voltage lockout for the bus voltage (PVin). This is desirable particularly for high output voltage applications,

where we might want the device to be disabled at least until PVin exceeds the desired output voltage level.

Alternatively, the default 8 V PVin UVLO threshold may be reconfigured/overridden using the VIN_ON and

VIN_OFF PMBus™ commands or the corresponding registers. It should be noted that the input voltage is also

fed to an ADC through a 21:1 internal resistive divider. However, the digitized input voltage is used only for the

purposes of reporting the input voltage through the READ_VIN PMBus™ command. It has no impact on the bus

voltage UVLO, input over-voltage faults and input under-voltage warnings, all of which are implemented by

using analog comparators to compare the input voltage to the corresponding thresholds programmed by the

PMBus™ commands VIN_ON, VIN_OFF, VIN_OV_FAULT_LIMIT and VIN_UV_WARN_LIMIT respectively. The bus

voltage reading as reported by READ_VIN has no effect on the input feedforward function either.

12V

10.2V

1 V

PVin

Vcc

> 0.6V

0.6V

EN_UVLO_START

EN

DAC2 (Reference DAC)

Figure 15 Normal Start up, device turns on when the bus voltage reaches 10.2 V. A resistor divider is

used at EN pin from PVin to turn on the device at 10.2 V.

PVin=Vin

Vcc

> 0.6V

EN

DAC2 (Reference DAC)

Figure 16 Recommended startup for Normal operation

Figure 16 shows the recommended startup sequence for the normal operation of the device, when Enable is

used as logic input.

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Theory of operation

14.6

Pre-Bias startup

The IR38164 is able to start up into pre-charged output, without oscillations or other disturbance of the output

voltage.

The output starts in asynchronous fashion and keeps the synchronous MOSFET (sync FET) off until the first gate

signal for the control MOSFET (ctrl FET) is generated. Figure 17 shows a typical pre-bias condition at start up.

[V]

Vo

Pre-Bias

Voltage

[Time]

Figure 17

Pre-Bias startup

The sync FET always starts with a narrow pulse width (12.5% of a switching period) and gradually increases its

duty cycle with a step of 12.5% until it reaches the steady state value. There are 16 pulses in each step. This

value is internally programmed. Figure 18 shows the series of 16x8 startup pulses.

...

HDRv

...

87.5%

12.5%

16

25%

...

LDRv

...

End of

PB

...

16

Figure 18

Pre-bias startup pulses

14.7

Soft-Start ꢇReference DAC rampꢈ

This device has an internal soft starting DAC to control the output voltage rise and to limit the current surge at

the start-up. To ensure correct start-up, the DAC sequence initiates only after power conversion is enabled

when the Enable pin voltage exceeds its under-voltage threshold, the PVin bus voltage exceeds its under-

voltage threshold and the contents of the MTP have been fully loaded into the working registers. Figure 19

shows the waveforms during soft start. It should be noted that the part may also be configured to require

software Enable (set through the PMBus™ or the corresponding MTP register) instead of or in addition to a

ꢆhardwareꢃ signal at the Enable pin. In PMBus™ mode, the reference DAC soft-start may be delayed from the

time power conversion is enabled. The range for this programmable delay is 0 ms to 127 ms, and the resolution

is 1 ms. Further, in this mode, the soft start time may be configured from 1 ms to 127 ms with 1 ms resolution.

In SVID mode, the rise time is determined by the slow slew rate specified by Intel, and may be programmed to

one of four values: 0.625 mV/µs, 1.25 mV/µs, 2.5 mV/µs and 5 mV/µs. In this mode, the device uses 2.5 mV/µs by

default. It should be noted, however, that if Vboot is 0, the output voltage does not ramp until the CPU issues a

voltage setting command at either the fast slew rate or slow slew rate specified by the CPU.

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Theory of operation

For more details on the PMBus™ commands TON_DELAY and TON_RISE used to program the startup sequence,

please see the UN0075 IR3816x PMBus™ commandset user note.

Internal Enable

Reference

DAC

Vout

Ton_delay

t₁

Ton_rise

t₃

t

2

Figure 19 DAC2 (VREF) Soft start

During the startup sequence the over-current protection (OCP) and over-voltage protection (OVP) are active to

protect the device against any short circuit or over voltage conditions.

14.8

Operating frequency

Using the FREQUENCY_SWITCH PMBus™ command, or the corresponding registers, the switching frequency

may be programmed between 500 kHz and 1.5 MHz. For best telemetry accuracy, it is recommended that the

following switching frequencies be avoided: 500 kHz, 600 kHz, 750 kHz, 800 kHz, 1 MHz, 1.2 MHz and 1.5 MHz.

Instead the following values are recommended, 505 kHz, 607 kHz, 762 kHz, 813 kHz, 978 kHz, 1171 kHz and 1454

kHz respectively.

14.9

Shutdown

In the default configuration, the device can be shutdown by pulling the Enable pin below its 0.4 V threshold.

During shutdown the high side and the low side drivers are turned off. By default, the device exhibits an

immediate shutdown with no delay and no soft stop.

Alternatively, the part may be configured to allow shutdown using the OPERATION PMBus™ command or the

corresponding register. It may also be configured to allow a soft or controlled turned off. In PMBus™ mode, if

the soft-off option is used, the turn off may be delayed from the time the power conversion is disabled. The

range for this programmable delay is 0 ms to 127 ms, and the resolution is 1 ms. Further, in this mode, the soft

stop time may be configured from 1ms to 127 ms with 1 ms resolution. The programmable turn off delay only

applies in PMBus™ mode.

If VCC voltage supply is used to shutdown the system, a continuous ramp from 5V to 0V should be utilized.

Shutdown via the Enable pin is the recommended shutdown method.

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Theory of operation

14.10

Current Sensing, Telemetry and Over-Current Protection

Current sensing for both telemetry as well as over-current protection is done by sensing the voltage across the

sync FET RDS(ON). This method enhances the converter’s efficiency, reduces cost by eliminating a current sense

resistor and any minimizes sensitivity to layout related noise issues. A novel, patented scheme allows

reconstruction of the average inductor current from the voltage sensed across the Sync FET RDS(ON). It should

be noted here that it is this reconstructed average inductor current that is digitized by the ADC and used for

output current reporting as well as for over-current warning, the threshold for which may be set using the

IOUT_OC_WARN_LIMIT command. The current is reported in 1/16 A resolution using the READ_IOUT PMBus™

command. The current information may also be read back using I2C, through the 8-bit register

output_current_byte, which reports the current in 1/4 A resolution.

The Over current (OC) fault protection circuit also uses the voltage sensed across the RDS(ON) of the

Synchronous MOSFET; however, the protection mechanism relies on a fast comparator to compare the sensed

signal to the over-current threshold and does not depend on the ADC or reported current. The current limit

scheme uses an internal temperature compensated current source that has the same temperature coefficient

as the RDS(ON) of the Synchronous MOSFET. As a result, the over-current trip threshold remains almost constant

over temperature.

Over Current Protection circuitry senses the inductor current flowing through the Synchronous FET closer to

the valley point. The OCP circuit samples this current for 75 ns typically after the rising edge of the PWM set

pulse which is an internal signal that has a width of 12.5% of the switching period. The PWM pulse that turns on

the high side FET starts at the falling edge of the PWM set pulse. This makes valley current sense more robust as

current is sensed close to the bottom of the inductor downward slope where transient and switching noise is

low. This helps to prevent false tripping due to noise and transients.

The actual DC output current limit point will be greater than the valley point by an amount equal to

approximately half of the peak to peak inductor ripple current. The current limit point will be a function of the

inductor value, input voltage, output voltage and the frequency of operation. On equation 1, I_Limitis the value

set when configuring the 38164 OCP value. The user should account for the inductor ripple to obtain the actual

DC output current limit.

i

I_OCP I_LIMIT



(1)

2

I_OCP

I_LIMIT

Δi

= DC current limit hiccup point

= Current Limit Valley Point

= Inductor ripple current

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Theory of operation

Over Current Limit

Hiccup Blanking Time

IL

0

HDrv

0

...

LDrv

0

PGood

0

Figure 20

Timing diagram for current limit hiccup

In the default configuration, if the over-current detection trips the OCP comparator for a total of 8 cycles, the

device goes into a hiccup mode. The hiccup is performed by de-asserting the internal Enable signal to the

analog and power conversion circuitry and holding it low for 20 ms.

Following this, the OCP signal resets and the converter recovers. After every hiccup cycle, the converter stays in

this mode until the overload or short circuit is removed. This behavior is shown in Figure 20.

Note that the user can override the default over-current threshold using the PMBus™ command

IOUT_OC_FAULT_LIMIT. This command can be used to program the over-current threshold from a minimum

recommended 16 A setting to a maximum of 56 A, in 4 A steps. While the IR38164 will still offer over-current

protection below 16 A and at magnitudes that are not multiples of 4, these thresholds will not be as accurate.

Therefore it’s recommended to keep the current limit setting from 16A to 56A with 4A increments. Systems with

a high inductor current ripple will affect the accuracy, refer to (1).

Also, using the PMBus™ command IOUT_OC_FAULT_RESPONSE or the corresponding registers, the part may be

configured to respond to an over-current fault in one of two ways:

1)

Pulse by pulse current limiting for a programmed number of eight switching cycles followed by a

latched shutdown.

2)

Pulse by pulse current limiting for a programmed number of eight switching cycles followed by hiccup.

The pulse-by-pulse or constant current limiting mechanism is briefly explained below.

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Theory of operation

IOUT_OC_FAULT_LIMIT

IL

20 ms

0

HDrv

0

LDrv

0

CLK

Fs

0

OCP High

1

2

3

4

5

6

7

8

Internal

Enable

Figure 21

Pulse by pulse current limiting for 8 cycles, followed by hiccup

In Figure 21 above, with the over-current response set to pulse-by-pulse current limiting for 8 cycles followed

by hiccup, the converter is operating at D<0.125 when the overcurrent condition occurs. In such a case, no duty

cycle limiting is applied.

IOUT_OC_ FAULT_ LIMIT

IL

0

HDrv

0

LDrv

0

CLK

Fs

0

1

2

3

4

5

6

7

8

9

10

11

...

Internal

Enable

Figure 22 Constant current limiting

Figure 22 depicts a case where the over-current condition happens when the converter is operating at D>0.5

and the over-current response has been set to constant current operation through pulse by pulse current

limiting. In such a case, after 3 consecutive over-current cycles are recognized, the pulse width is dropped such

that D=0.5 and then after 3 more consecutive OCP cycles, to 0.25 and then finally to 0.125 at which it keeps

running until the total OCP count reaches the programmed maximum following which the part enters hiccup

mode. Conversely, when the over-current condition disappears, the pulse width is restored to its nominal value

gradually, by a similar mechanism in reverse; every sequence of 4 consecutive cycles in which the current is

below the over-current threshold doubles the duty cycle, so that D goes from 0.125 to 0.25, then to 0.5 and

finally to its nominal value.

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Theory of operation

14.11

Current reporting limitation at high operating temperature

The IR38164 is designed to give the industry’s highest accuracy output current reporting across a range of ꢂ to

30 Amps. To achieve the goal of highest possible accuracy particularly at Iout up to 30Amps, a high gain was

used in the Rds_on current sensing circuit. As the operating temperature increases the Rds_on of the low side

MOSFET increases and at the rated current of 30A with junction temperatures around 90 °C, the ADC saturates

and no longer reads higher values of the MOSFET RDS_on. The result is that at a high operating junction

temperature condition the maximum PMBus™ and SVID current reporting is clamped as shown in Figure 23

below.

Maximum Iout reported verses IR38164 internal temperature

35

30

25

Typical (based on measured data)

20

Calculated worst case

15

10

5

0

20

40

60

80

IC die Temp , PMBUS reported ,C

100

120

Figure 23 Maximum Iout reported versus IR38164 reported die temperature

Note that Infineon does not recommend operating the part with a reading of the ADC being clamped, because

other readings of the ADC can be compromised. If higher Iout readings are needed, the IR38163 with a lower

gain in the Rds_on detection circuit is recommended to be used. Lastly, please note that the current limit

ability of the IR38164 is not affected by the ADC clamping. The IR38164 current limit function is performed by

an analog circuit and does not use the ADC. The OCP warn function (PMBUS setting) is however based on the

ADC output and will not function properly at a high temperature if the threshold is set higher than the

maximum current reported shown above.

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Theory of operation

14.12

Die temperature sensing, telemetry and thermal shutdown

On die temperature sensing is used for accurate temperature reporting and over-temperature detection. The

READ_TEMEPRATURE PMBus™ command reports this temperature in 10 ⁰C resolution. The temperature may

also be read back using I2C through the 8-bit register temp_byte, which reports the die temperature in 1 °C

resolution, offset by 40 °C. Thus, the temperature is given by temp_byte +40 °C.

The trip threshold is set by default to 125 °C. The default over temperature response of the device is to inhibit

power conversion while the fault is present, followed by automatic restart after the fault condition is cleared.

Hence, in the default configuration, when the trip threshold is exceeded, the internal Enable signal to the

power conversion circuitry is de-asserted, turning off both MOSFETs.

Automatic restart is initiated when the sensed temperature drops within the operating range. There is a 25 °C

hysteresis in the thermal shutdown threshold.

The default over-temperature threshold as well as over-temperature response may be re-configured or

overridden using the OT_FAULT_LIMIT and OT_FAULT_RESPONSE PMBus™ commands respectively or the

corresponding registers may be used. The devices support three types of responses to an over-temperature

fault:

1)

2)

Ignore

Inhibit when the over-temperature condition exists and auto-restart when the over-temperature

condition disappears

3) Latched shutdown.

14.13

Remote voltage sensing

True differential remote sensing in the feedback loop is critical to high current applications where the output

voltage across the load may differ from the output voltage measured locally across an output capacitor at the

output inductor, and to applications that require die voltage sensing.

The RS+ and RS- pins form the inputs to a remote sense differential amplifier with high speed, low input offset

and low input bias current, which ensure accurate voltage sensing and fast transient response in such

applications.

The input range for the differential amplifier is limited to 1.5 V below the VCC rail. Therefore, for applications in

which the output voltage is more than 2.55 V, it is recommended to use local sensing, or if remote sensing is a

must, then the voltage between the RS+ and RS-pins must be divided down to less than 2.55 V using a resistive

voltage divider. It’s recommended that the divider be placed at the input of the remote sense amplifier and that

a low impedance such as 499 Ω be used between the RS+ and RS- nodes. A typical schematic for this setup is

shown on Figure 8 Please note, however, that this modifies the open loop transfer function and requires a

change in the compensation network to optimally stabilize the loop.

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Theory of operation

14.14

Feed-forward

Feed-Forward (F.F.) is an important feature, because it can keep the converter stable and preserve its load

transient performance when PVin varies over a wide range. The PWM ramp amplitude (Vramp) is

proportionally changed with PVin to maintain PVin/Vramp almost constant throughout PVin variation range (as

shown in Figure 24). Thus, the control loop bandwidth and phase margin can be maintained constant. The

feed-forward function can also minimize impact on output voltage from fast PVin changes. The feedforward is

disabled for PVin<4.7 V. Hence, for PVin<4.7 V, a re-calculation of control loop parameters is needed for re-

compensation.

21V

12V

5V

PVin

0

PWM Ramp

Ramp Offset

0

Figure 24

Timing diagram for feed-forward (F.F.) function

14.15

Output voltage sensing, telemetry and faults

For this family of devices, the voltage sense and regulation circuits are decoupled, enabling ease of testing as

well as redundancy. In order to do this, the device uses the sense voltage at the dedicated Vsns pin for output

voltage reporting (in 1/256 V resolution, using the READ_VOUT PMBus™ command) as well as for power good

detection and output over-voltage protection.

Power good detection and output over-voltage detection rely on fast analog comparator circuits, whereas over-

voltage warnings as well as under-voltage faults and warnings rely on comparing the digitized Vsns to the

corresponding thresholds programmed using PMBus™ commands VOUT_OV_WARN_LIMIT,

VOUT_UV_FAULT_LIMIT and VOUT_UV_WARN_LIMIT respectively or the corresponding.

14.16

Power Good Output

The Vsns voltage is an input to the window comparator with programmable thresholds. The PGood signal is

high whenever Vsns voltage is within the PGood comparator window thresholds. The PGood pin is open drain

and it needs to be externally pulled high. High state indicates that output is in regulation. The Power Good

thresholds may be changed through the POWER_GOOD_ON and POWER_GOOD_OFF commands, which set the

rising and falling PGood thresholds respectively. The thresholds may also be programmed using the

corresponding MTP registers. However, when no resistive divider is used, such as for output voltages lower

than 2.555 V, the Power Good thresholds must be programmed to within 630 mV of the output voltage,

otherwise, the effective power good threshold changes from an absolute threshold to one that tracks the

output voltage with a 630 mV offset. By default, the PGood signal will assert as soon as the Vsns signal enters

the regulation window. In digital mode, this delay is programmable from 0 to 10 ms with a 1 ms resolution,

using the MFR_TPGDLY command.

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Theory of operation

The threshold is set differently in SVID mode. In this mode, the thresholds set by the POWER_GOOD_ON and

POWER_GOOD_OFF commands (or the corresponding registers) are ignored. Power Good is asserted when the

output voltage is within the tolerance band of the boot voltage. Following this, the Power Good signal remains

asserted irrespective of any output voltage transitions and is de-asserted only in the event of a fault that shuts

down power conversion, or, if so programmed, in the event of a command by the CPU to change the output

voltage to 0 V.

Fault DAC

0

Reference DAC

0

Power Good upper threshold

Vsns

0

Power Good lower threshold

PGD

0

160us

Figure 25

Power good in PMBus™ mode

Fault DAC

0

Reference DAC

0

Vboot+/-TOB

Vsns

0

PGD

0

Figure 26

Power Good in SVID mode, Vboot>0 V

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Theory of operation

14.17

Over-Voltage Protection ꢇOVPꢈ

Over-voltage protection is achieved by comparing sense pin voltage Vsns to a configurable over-voltage

threshold.

The OVP threshold may be reprogrammed to within 655 mV of the output voltage (for output voltages lower

than 2.555 V, without any resistive divider on the Fb pin), using the VOUT_OV_FAULT_LIMIT PMBus™ command

or the corresponding registers. For an OVP threshold programmed to be more than 655 mV greater than the

output voltage, the effective OV threshold ceases to be an absolute value and instead tracks the output voltage

with a 655 mV offset.

When Vsns exceeds the over-voltage threshold, an over-voltage trip signal asserts after 200 ns (typ.) delay. The

default response is that the high side drive signal HDrv is latched off immediately and PGood flags are set low.

The low side drive signal is kept on until the Vsns voltage drops below the threshold. HDrv remains latched off

until a reset is performed by cycling either Vcc or Enable or the OPERATION command. The device allows the

user to reconfigure this response by the use of the VOUT_OV_FAULT_RESPONSE PMBus™ command. In addition

to the default response described above, this command can be used to configure the device such that Vout

over-voltage faults are ignored and the converter remains enabled. (However, they will still be flagged in the

STATUS_REGISTERS and by SAlert). For further details on the corresponding PMBus™ commands related to

OVP, please refer to the UN0075 IR3816x PMBus™ commandset user note.

Vsns voltage is set by an external resistive voltage divider connected to the output. This divider ratio must

match the divider used on the feedback pin or on the RS+ pin.

It should be noted that the over-voltage threshold applies in PMBus™ mode as well as SVID mode.

DAC1+OV_OFFSET_DAC

Vout

DAC1

hysteresis

0

HDrv

0

LDrv

0

Comp

0

PGood

0

200 ns

Figure 27

Timing diagram for OVP in non-tracking mode

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Theory of operation

14.18

Minimum On-Time Considerations

The minimum ON time is the shortest amount of time for the Control FET to be reliably turned on. This is a very

critical parameter for low duty cycle, high frequency applications. In the conventional approach, when the error

amplifier output is near the bottom of the ramp waveform with which it is compared to generate the PWM

output, propagation delays can be high enough to cause pulse skipping, and hence limit the minimum pulse

width that can be realized. Moreover, in the conventional approach, the bottom of the ramp often presents a

high gain region to the error amplifier output, making the modulator more susceptible to noise and requiring

the use of lower control loop bandwidth to prevent noise, jitter and pulse skipping.

Infineon has developed a proprietary scheme to improve and enhance the minimum pulse width which

minimizes these delays and hence, allows stable operation with small pulse-widths. At the same time, this

scheme also has greater noise immunity, thus allowing stable, jitter free operation down to very low pulse

widths even with a high control loop bandwidth, thus reducing the required output capacitance.

Any design or application using this IC must ensure operation with a pulse width that is higher than the

minimum on-time and at least 70 ns of on-time is recommended in the application. This is necessary for the

circuit to operate without jitter and pulse-skipping, which can cause high inductor current ripple and high

output voltage ripple.

V_out

F_sPV  F_s

D

t_on



(2)

in

In any application that uses this IC, the following condition must be satisfied:

t_on(min) t_on

(3)

V_out

t_on(min)



(4)

(5)

PV  F_s

in

V_out

PV  F_s

in

t_on(min)

The minimum output voltage is limited by the reference voltage and hence Vout(min) = 0.5 V. Therefore, for

Vout(min) = 0.5 V,

V_out

(6)

PV  F_s

in

t_on(min)

Therefore, at the maximum recommended input voltage of 16V with the minmum recommended frequency of

500 kHz the minimum output voltage should be => 0.56 V. Conversely for operation at a high frequency of 1 MHz

and minimum output voltage (0.5 V), the input voltage (PVin) should not exceed 7.1 V, otherwise pulse skipping

may happen. Pulse skipping is not an issue except that the ripple maybe slighty higher in this operating mode.

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Theory of operation

14.19

Maximum Duty Ratio

An upper limit on the operating duty ratio is imposed by the larger of a) fixed off time (dominant at high

switching frequencies) b) blanking provided by the PWMSet or clock pulse, which has a pulse width that is 1/8

of the switching period. The latter mechanism is dominant at lower switching frequencies (typically below 1.25

MHz). This upper limit ensures that the Sync FET turns on for a long enough duration to allow recharging the

bootstrap capacitor and also allows current sensing. Figure 28 shows a plot of the maximum duty ratio vs. the

switching frequency with built in input voltage feed-forward mechanism.

Figure 28

Maximum duty cycle vs. switching frequency with Vin feedforward

14.20

Bootstrap Capacitor

To drive the Control FET, it is necessary to supply a gate voltage at least 4 V greater than the voltage at the SW

pin, which is connected to the source of the Control FET. This is achieved by using a bootstrap configuration,

which comprises the internal bootstrap diode and an external bootstrap capacitor (C1) as shown in Figure 29.

Typically a 0.1 µF capacitor is used. A layout placement for a 0 ohm resistor in series with the capacitor is also

recommended. For applications where PVin>14 V, a 1 ohm resistor is required. The operation of the circuit is as

follows: When the sync FET is turned on, the capacitor node connected to SW is pulled down to ground. The

capacitor charges towards V_ccthrough the internal bootstrap diode which has a forward voltage drop V_D. The

voltage V_cacross the bootstrap capacitor C1 is approximately given as:

(7)

V_cV_ccV_D

When the Control FET turns on in the next cycle, the capacitor node connected to SW rises to the bus voltage

PVin. However, if the value of C1 is appropriately chosen, the voltage Vc across C1 remains approximately

unchanged and the voltage at the Boot pin becomes:

(8)

V_Boot PV V V_D

in

cc

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Theory of operation

Cvin

PVIN

+ V_D

-

Boot

V

cc

+

Vc

-

C1

SW

L

IR38164

PGnd

Figure 29

Bootstrap circuit to generate high side drive voltage

14.21

Intel SVID interface

The IR38164 implements a fully compliant Intel^®VR 13, and VR 12.5 Serial VID (SVID) interface. This is a three-

wire interface between an Intel processor and a VR that consists of clock, data and alert# signals.

The IR38164 implements all the required SVID registers and commands per Intel specifications. For the selected

Intel mode, the IC also implements most of the optional commands and registers with very few exceptions.

The default SVID addresses of the devices is 02h. This address can be re-programmed in MTP or via GUI.

14.22

All Call support

All Call for the IR38164 can be configured in the following ways:



0E and 0F.

0E only.

0F only.

No All Call

The devices can be configured to be used as VR for CPU which is All Call 0F or Memory which is All Call 0E.

14.23

VRꢁꢄ.ꢅ operation

VR 12.5 mode is selectable via MTP bit. The boot voltage in VR 12.5 is also selectable and can be taken from the

boot registers. The resolution is programmable via MTP bit to 10 mV to be compatible to VR12.5 mode.

14.24

VRꢁꢀ operation

VR 13 mode is selectable via MTP bit. The boot voltage in VR13 mode is configured in the boot register. The

resolution is programmable via MTP bit to 5 mV or 10 mV, to be compatible to VR13 mode.

14.25

Set Work Point

This family of devices supports SVID Set WP command to Set VID voltage for all rails through all call address.

When the processor asserts a Set WP command, all the rails of the VR settle to the corresponding new set

voltage encoded in WP registers. Slew rate and power state of all the rails are identical during a set work point

operation.

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Theory of operation

14.26

Dynamic VID slew rate

The device provides the VR designer 16 fast slew rates that govern the rate of VID transitions. The slow slew rate

is also programmable as a function of the fast slew rate, and 4 different options are available for each setting

of the fast slew rate as shown below in Table 12.

Table 12

Slew Rates

Fast Rate

x 1/2

x 1/4

x 1/8 Factor

x 1/16 Factor

mV/us

Factor

10

5.0

7.5

10

2.50

3.75

5.00

6.25

7.5

1.25

1.875

2.50

3.125

3.75

4.375

5.0

0.0625

0.94

1.25

1.56

1.88

2.19

2.5

15

20

25

12.5

15

30

35

17.5

20

8.75

10

40

45

22.5

25

11.25

12.5

13.75

15

5.625

6.25

6.875

7.5

2.81

3.125

3.4375

3.75

4.0625

4.375

5

50

55

27.5

30

60

65

32.5

35

16.25

17.5

20

8.125

8.75

10

70

80

40

14.27

Loop compensation

Feedback loop compensation is achieved using standard Type III techniques and the compensation values can

be easily calculated using Infineon’s design tool. The design tool can also be used to predict the control

bandwidth and phase margin for the loop for any set of user defined compensation component values. For a

theoretical understanding of the calculations used, please refer to Infineon’s Application Note AN-1162

ꢆCompensator Design Procedure for Buck Converter with Voltage-Mode Error-Amplifierꢃ.

14.28

Dynamic VID compensation

This family of devices uses an analog control scheme with voltage mode control. In this scheme, the

compensator acts on the Vout signal and not just on the error signal. For load and line transients, with a steady

and unchanging reference voltage, this has the same dynamic characteristics as for a compensator that acts on

only the error signal. However, for reference voltage changes, as in the case of Dynamic VID, the dynamics are

altered. A proprietary dynamic VID compensation scheme allows the dynamic VID response to be tuned

optimally to the feedback compensator values. Once properly optimized, the output voltage will follow the DAC

more closely during a positive dynamic VID, and provide better dynamic VID alert timing, as required by Intel®

processors. Infineon’s SupIRBuck design tool will allow the user to quickly and conveniently calculate the

dynamic VID compensation parameters for optimal dynamic VID response.

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

IꢄC and PMBus™ communication protocols

15

IꢄC and PMBus™ communication protocols

15.1

IꢄC Protocols

All registers may be accessed using either I2C or PMBus™ protocols. I2C allows the use of a simple format

whereas PMBus™ provides error checking capability. Figure 30 shows the I2C format employed by IC.

S: Start Condition

1

S

7

Slave

Address

1

8

1

8

1

P

A: Acknowledge (0')

N: Not Acknowledge (1')

Sr: Repeated Start Condition

P: Stop Condition

Register

Address

WRITE

READ

A

W

Data Byte

R: Read (1')

1

7

1

P

1

S

7

Slave

Address

1

8

1

S

1

R

8

W: Write (0')

Register

Address

Slave

Address

A

Data Byte

A

N

W

PEC: Packet Error Checking

*: Present if PEC is enabled

: Master to Slave

: Slave to Master

Figure 30

I2C format

15.2

SMBus/PMBus™ protocols

To access IR’s configuration and monitoring registers, ꢇ different protocols are required:



the SMBus Read/Write Byte/Word protocol with/without PEC (for status and monitoring)

the SMBus Send Byte protocol with/without PEC (for CLEAR_FAULTS only)

the SMBus Block Read protocol for accessing Model and Revision information

the SMBus Process call (for accessing Configuration Registers)

In addition, IC supports:



Alert Response Address (ARA)

Bus timeout

Group Command for writing to many VRs within one command

These various commands are illustrated in Figure 31 through Figure 37 below.

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

IꢄC and PMBus™ communication protocols

S: Start Condition

8

1

S

7

Slave

Address

1

8

1

8

1

P

A: Acknowledge (0')

N: Not Acknowledge (1')

Sr: Repeated Start Condition

P: Stop Condition

Command

Code

A*

BYTE

A

Data Byte

A

PEC*

W

1

S

1

R: Read (1')

7

Slave

Address

1

8

1

Command

Code

Data Byte

Low

W: Write (0')

WORD

A

W

…

PEC: Packet Error Checking

*: Present if PEC is enabled

: Master to Slave

1

8

1

P

8

Data Byte

High

A*

PEC*

A

: Slave to Master

Figure 31

SMBus write byte/word

1

P

1

8

1

7

Slave

Address

1

R

1

8

1

7

Slave

Address

8

Command

Code

Data Byte

A*

A

PEC*

N

BYTE

S

W

Sr

1

S

7

Slave

Address

1

8

1

7

Slave

Address

1

R

1

8

1

Command

Code

Data Byte

Low

A

Sr

A

WORD

W

…

1

8

1

8

Data Byte

High

A*

PEC*

N

P

Figure 32

Figure 33

SMbus read byte/word

1

S

7

Slave

Address

1

8

1

8

1

P

Command

Code

PEC*

A

A*

A

W

SMBus send byte

1

S

7

Slave

Address

1

8

1

Command

Code

W

A

…

1

7

Slave

Address

1

R

1

8

1

Byte Count =1

Data Byte

A*

A

PEC*

N

P

Sr

Figure 34

Figure 35

SMBus block read with byte count = 1

PMBus

Address

Command

D1h

Register

Address

Data Byte

PEC*

S

W

A

P

MFR specific command to write an internal register

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

IꢄC and PMBus™ communication protocols

PMBus

Address

Command

D0h

Register

Address

S

W

A

...

PMBus

Address

Address+1

Data Byte

PEC*

Sr

R

A

A*

N

P

Figure 36

SMBus custom protocol call to read an internal register

1

S

7

Slave

Address 1

1

8

1

8

Low

Data Byte

1

8

High

Data Byte

1

8

1

Command

Code 1

A*

A

W

A

PEC1*

…

1 or more bytes

7

Slave

Address 2

1

8

1

8

Low

Data Byte

1

8

High

Data Byte

1

8

1

Command

Code 2

A

A*

A

Sr

W

PEC2*

…

1 or more bytes

1

7

1

8

1

8

1

8

1

8

1

Low

Data Byte

Slave

Address n

Command

Code n

High

Data Byte

A

P

Sr

W

A

PECn*

…

1 or more bytes

Figure 37

Group command

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

IꢄC and PMBus™ communication protocols

15.3

Supported PMBus™ commands

Table 13

Command

Code

SMBus

transaction bytes

No. of

Resolutio

n

Default

Value

Command Name

Range

Description

01h

02h

OPERATION

ON_OFF_CONFIG

R/W Byte

1

Enables or disables the device and controls margining

Configures the combination of Enable pin input and

serial bus commands needed to turn the unit on and off.

Clear contents of Fault registers

03h

10h

CLEAR_FAULTS

Send Byte

R/W Byte

0

1

WRITE_PROTECT

Used to control writing to the PMBus™ device. The

intent of this command is to provide protection against

accidental changes.

15h

16h

STORE_USER_ALL

Send Byte

0

Burns the User section registers into OTP memory

RESTORE_USER_A

LL

Copies the OTP registers into User memory

19h

1Bh

CAPABILITY

Read Byte

1

2

Returns 1011xxxx to indicate Packet Error Checking is

supported, maximum bus speed is 400 kHz and

SMBAlert# is supported.

May be used to prevent a warning or fault condition

from asserting the SMBALERT# signal.

SMBALERT_MASK

VOUT_COMMAND¹⁶

Write

word/Block

read

Process call

R/W Word

21h

2

0-

2.555V/

V_S

-128-

+128V

5mV/V_S

1V

Causes the device to set its output voltage to the

commanded value.

V_S= VOUT_SCALE_LOOP

22h

24h

VOUT_TRIM¹⁶

VOUT_MAX¹⁶

R/W Word

2

0V

2V

Available to the device user to trim the output voltage

Sets an upper limit on the output voltage the unit can

command regardless of any other commands or

combinations.

25h

26h

27h

29h

VOUT_MARGIN_HI

GH¹⁶

R/W Word

2

0-

2.555V/

V_S

0-

2.555V/

V_S

5mV/V_S

Sets the MARGIN high voltage when commanded by

OPERATION

V_S= VOUT_SCALE_LOOP

Sets the MARGIN low voltage when commanded by

OPERATION

V_L= VOUT_SCALE_LOOP

VOUT_MARGIN_LO

W¹⁶

VOUT_TRANSITION R/W Word

_RATE¹¹

0-

0.0625mV/ 0.0625mV/us Sets the rate in mV/μs at which the output should

63.9mV/ us

us

0.125-1

change voltage. Exponent 0 to -4 allowed.

VOUT_SCALE_LOO

P¹¹

R/W Word

1

Compensates for external resistor divider in feedback

path and in the sense path. Values 1, 0.5, 0.25, 0.125

allowed. Exponent -3 allowed.

33h

35h

FREQUENCY_SWIT

CH¹¹

R/W Word

2

504-

1500kHz

0-16.5V

978kHz

8.0V

Sets the switching frequency, in kHz. Exponent 0 to 1

allowed.

Sets the value of the input voltage, in volts, at which the

unit should start power conversion. Exponent -1

allowed.

Sets the value of the input voltage, in volts, at which the

unit, once operation has started, should stop power

conversion. Exponent -1 allowed.

VIN_ON¹¹

0.5V

36h

VIN_OFF¹¹

R/W Word

2

0-16V

7.0V

39h

40h

IOUT_CAL_OFFSET

R/W Word

2

-128A-

+127.5A

(25-

655mV)/

V_S

0.25A

0A

Used to null out any offsets in the output current

sensing circuit. Exponent -2 allowed.

Sets the value of the output voltage measured at the

sense pin that causes an output over-voltage fault.

V_S= VOUT_SCALE_LOOP

11

VOUT_OV_FAULT_

LIMIT¹⁶

10mV/V_S

2.102V

41h

VOUT_OV_FAULT_

RESPONSE

R/W Byte

1

Ignore/S

hutdow

n

Shutdown Instructs the device on what action to take in response

to an output over-voltage fault. Ignore =0x00h,

Shutdown = 0x80h.

42h

43h

VOUT_OV_WARN_L R/W Word

2

3.9mV

1.902V

Sets the value of the output voltage at the

sense pin that causes an output voltage high warning.

Sets the value of the output voltage at the

sense pin that causes an output voltage low warning.

IMIT¹⁶

VOUT_UV_WARN_L R/W Word

0.902V

IMIT¹⁶

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

IꢄC and PMBus™ communication protocols

Command

Code

SMBus

transaction bytes

No. of

Resolutio

n

Default

Value

Command Name

Range

Description

44h

VOUT_UV_FAULT_

LIMIT¹⁶

VOUT_UV_FAULT_

RESPONSE

R/W Word

R/W Byte

2

1

3.9mV

0.898V

Sets the value of the output voltage at the

sense pin that causes an output under-voltage fault.

Instructs the device on what action to

45h

46h

Ignore/S

hutdow

n

Ignore

40A

take in response to an output under-voltage fault.

IOUT_OC_FAULT_L R/W Word

IMIT¹¹

2

1

3-40A

0.5A

Sets the value of I_Limit(valley), allowing user to set the

output current in amperes, that causes the over-

current detector to indicate an over-current fault.

Exponent -1 allowed.

47h

IOUT_OC_FAULT_

RESPONSE

R/W Byte

Pulse by

Instructs the device on what action to

pulse for 8 take in response to an output over-current fault.

cycles

followed by

hiccup, retry

after 20 ms

4Ah

4Fh

50h

IOUT_OC_WARN_L

IMIT¹¹

R/W Word

R/W Byte

2

1

0-63.5A

0.5A

35A

Sets the value of the output current, in

amperes, that causes the over-current detector to

indicate an over-current warning. Exponent -1 allowed.

Set the temperature, in degrees Celsius, of the unit at

which it should indicate an over-temperature fault.

Exponent 0 allowed.

OT_FAULT_LIMIT¹¹

0-150°C

1°C

125°C

OT_FAULT_RESPO

NSE

Ignore/S

hutdow

n/ Auto-

start

Auto-start Instructs the device on what action to take in response

to an over-temperature fault.

51h

OT_WARN_LIMIT¹¹

R/W Word

2

0-150°C

1°C

100°C

Set the temperature, in degrees Celsius, of the unit at

which it should indicate an over-temperature warning

alarm. Exponent 0 allowed.

55h

56h

VIN_OV_FAULT_LI

MIT¹¹

VIN_OV_FAULT_RE

SPONSE

R/W Word

R/W Byte

2

1

6.25V-

24V

Ignore/S

hutdow

n

0.25V

15V

Sets the value of the input voltage that causes an input

over-voltage fault. Exponent -2 allowed.

Instructs the device on what action to take

in response to an input over-voltage fault.

Ignore

58h

5Eh

5Fh

60h

VIN_UV_WARN_LIM R/W Word

IT¹¹

2

0-16V

0.5V

10mV/V_S

1ms

7.5V

0.5V

Sets the value of the input voltage PVin, in volts,

that causes an input over-voltage fault. Exponent -1

allowed.

Sets the output voltage at which an optional

POWER_GOOD signal should be asserted.

V_S=VOUT_SCALE_LOOP

Sets the output voltage at which an optional

POWER_GOOD signal should be negated.

V_S=VOUT_SCALE_LOOP

Sets the time, in milliseconds, from when a start

condition is received (as programmed by the

ON_OFF_CONFIG command) until the output voltage

starts to rise. Exponent 0 allowed.

POWER_GOOD_ON

R/W Word

(0-

0.63V)/V

16

S

POWER_GOOD_OF

F¹⁶

(0-

0.63V)/V

S

0.25V

0ms

TON_DELAY¹¹

0-127ms

61h

62h

TON_RISE¹¹

R/W Word

2

0-127ms

1ms

Sets the time, in milliseconds, from when the output

starts to rise until the voltage has entered the

regulation band. Exponent 0 allowed.

TON_MAX_FAULT_

LIMIT¹¹

0 (Disabled) Sets an upper limit, in milliseconds, on how long the

unit can attempt to power up the output without

reaching the output under-voltage fault limit. Exponent

0 allowed.

63h

64h

TON_MAX_FAULT_

RESPONSE

R/W Byte

R/W Word

1

2

Ignore/S

hutdow

n

Ignore

Instructs the device on what action to

take in response to a TON_MAX fault.

TOFF_DELAY

0-127ms

1ms

0ms

Sets the time, in milliseconds, from a stop condition is

received (as programmed by the ON_OFF_CONFIG

command) until the unit stops transferring energy to

the output. Exponent 0 allowed.

Sets the time, in milliseconds, in which the reference

voltage ramps down to zero (If a soft off is allowed by

the configuration of the ON_OFF_CONFIG command).

Exponent 0 allowed.

65h

78h

TOFF_FALL

R/W Word

Read Byte

2

1

0-127ms

1ms

STATUS BYTE

Returns 1 byte where the bit meanings are:

Bit <7> device busy fault

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

IꢄC and PMBus™ communication protocols

Command

Code

SMBus

transaction bytes

No. of

Resolutio

n

Default

Value

Command Name

Range

Description

Bit <6> output off (due to fault or enable)

Bit <5> Output over-voltage fault

Bit <4> Output over-current fault

Bit <3> Input under-voltage fault

Bit <2> Temperature fault

Bit <1> Communication/Memory/Logic fault

Bit <0>: None of the above

79h

STATUS WORD

Read Word

2

Returns 2 bytes where the Low byte is the same as the

STATUS_BYTE data. The High byte has bit meanings are:

Bit <7> Output high or low fault

Bit <6> Output over-current fault

Bit <5> Input under-voltage fault

Bit <4> Reserved; hardcoded to 0

Bit <3> Output power not good

Bit <2:0> Hardcoded to 0

7Ah

7Bh

7Ch

7Dh

STATUS_VOUT

STATUS_IOUT

STATUS_INPUT

Read Byte

1

Reports types of VOUT related faults.

Reports types of IOUT related faults.

Reports types of INPUT related faults.

STATUS_TEMPERA

TURE

Returns over- temperature warning and over-

temperature fault (OTP level). Does not report under-

temperature warning/fault. The bit meanings are:

Bit <7> Over-Temperature Fault

Bit <6> Over-Temperature Warning

Bit <5> Under-Temperature Warning

Bit <4> Under-Temperature Fault

Bit <3:0> Reserved

7Eh

STATUS_CML

Read Byte

1

Returns 1 byte where the bit meanings are:

Bit <7> Command not Supported

Bit <6> Invalid data

Bit <5> PEC fault

Bit <4> OTP fault

Bit <3:2> Reserved

Bit<1> Other communication fault

Bit<0> Other memory or logic fault; hardcoded to 0

Returns the input voltage in volts

88h

8Bh

8Ch

8Dh

READ_VIN¹¹

READ_VOUT¹⁶

READ_IOUT¹¹

Read Word

2

Returns the output voltage in volts

Returns the output current in amperes

Returns the device temperature in degrees Celsius

READ_TEMPERATU Read Word

RE¹¹

96h

98h

READ_POUT¹¹

Read Word

2

1

Returns the output power in watts

PMBUS™_REVISIO

Read Byte

Reports PMBus™ Part I rev 1.2 & PMBus™

Part II rev 1.2

N

99h

9Ah

MFR_ID

Block

Read/Write

Block

2

3

IR

Returns ꢀ bytes used to read the manufacturer’s ID.

User can overwrite with any value.

MFR_MODEL

Set 000000 If set to 000000h, returns a 1 byte code corresponding to

IC_DEVICE_ID. Alternatively, user can set to any non-zero

value

Read/Write

9Bh

ADh

MFR_REVISION

Block

Read/Write

3

Set 000000 If set to 000000h, returns a 1 byte code corresponding to

IC_DEVICE_REV.

Alternatively, user can set to any non-zero value

Used to read the type or part number of an IC.

IR38164: 6Dh

IC_DEVICE_ID

Block Read

2

1

AEh

IC_DEVICE_REV

Used to read the revision of the IC

Final Datasheet

53 of 64

V2.2

Feb 6 2019

IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

IꢄC and PMBus™ communication protocols

Command

Code

SMBus

transaction bytes

No. of

Resolutio

n

Default

Value

Command Name

Range

Description

D0h

MFR_READ_REG

Custom

Write Word

R/W Word

2

Manufacturer Specific: Read from configuration

registers

D1h

D8h

MFR_WRITE_REG

MFR_TPGDLY

Manufacturer Specific: Write to configuration & status

registers

0-10ms

0-1

1ms

0ms

CCM

10h

Sets the delay in milliseconds, between the output

voltage entering the regulation window and the

assertion of the PGood signal. Exponent 0 allowed.

Allows the user to choose between forced continuous

conduction mode and adaptive on-time operation at

light load.

D9h

MFR_FCCM

R/W Byte

R/W Word

1

D6h

DBh

MFR_I2C_address

MFR_VOUT_PEAK¹⁶Read Word

1

2

0-7Fh

Sets and returns the device I2C base address

Continuously records and reports the highest value of

Read Vout.

Continuously records and reports the highest value of

Read Iout.

Continuously records and reports the highest value of

Read_Temperature

DCh

DDh

MFR_IOUT_PEAK¹¹Read Word

2

MFR_TEMPERATUR Read Word

E_PEAK¹¹

Notes

¹¹Uses LINEAR11 format

¹⁶Uses LINEAR16 format with exponent set to-8

Final Datasheet

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V2.2

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

PCB footprint and layout recommendations

16

PCB footprint and layout recommendations

16.1

Layout recommendations

PCB layout is very important when designing high frequency switching converters. Layout will affect noise

pickup and can cause a good design to perform with less than expected results.

Make the connections for the power components on the top layer with wide, copper filled areas or shapes. In

general, it is desirable to make proper use of power planes and polygons for power distribution and heat

dissipation.

The input capacitors, inductor, output capacitors and the IR38164 should be as close to each other as possible.

This helps to reduce the EMI radiated by the power traces due to the high switching currents through them.

Place the input capacitor directly at the PVin pin of IR38164. The feedback part of the system should be kept

away from the inductor and other noise sources. The critical bypass components such as capacitors for Vin,

Vcc, and 1.8 V should be close to their respective pins. It is important to place the feedback components

including feedback resistors and compensation components close to Fb and Comp pins.

In a multilayer PCB, use one layer as a power ground plane and have a control circuit ground (analog ground) to

which all signals are referenced. The goal is to localize the high current path to a separate loop that does not

interfere with the more sensitive analog control functions. These two grounds must be connected together on

the PC board layout at a single point. It is recommended to place all the compensation parts over the analog

ground plane in top layer.

IR38164 has three pins, SCL, SDA and SALERT# that are used for I2C/PMBus™ communication. It is

recommended that the traces used for these communication lines be at least 10 mils wide with spacing

between the SCL and SDA traces that is at least 2-3 times the trace width. Follow the Intel^®recommended PCB

routing techniques for the SVID interface.

The Power QFN is a thermally enhanced package. To effectively remove heat from the device, the exposed pad

should be connected to the ground planes using multiple vias.

As shown in the PCB layout:



Allow enough copper for PVin, GND and Vout

All bypass capacitors are placed as close as possible to their connecting pins

Components for loop compensation are placed as close as possible to the COMP pin

AGND is connected to the inner PGND plane through via holes

Resistor Rt is placed as close as possible to the Rt pin

SW node copper should only be routed on the top layer to minimize switching noises

Fb and Vsns trace routing are kept away from SW node

Thermal via holes are placed on PVIN and PGND pads to aid thermal dissipation

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

PCB footprint and layout recommendations

16.2

PCB Metal and Component Placement

Evaluation has shown that the best overall performance is achieved using the substrate/PCB layout as shown in

the following figures. PQFN devices should be placed to an accuracy of 0.050 mm on both X and Y axes. Self-

centering behavior is highly dependent on solders and processes, and experiments should be run to confirm

the limits of self-centering on specific processes.

For further information, please refer to ꢆSupIRBuck™ Multi-Chip Module (MCM) Power Quad Flat No-Lead

(PQFN) Board Mounting Application Note.ꢃ ꢈANꢉꢉꢊꢀꢅ.

All dimensions in the following figures are in mm.

The PCB pads and component footprint are shown in Figure 38.

Figure 38

PCB pads and component

16.3

PCB copper and solder resist

Infineon recommends that larger Power or Land Area pads are Solder Mask Defined (SMD.) This allows the

underlying copper traces to be as large as possible, which helps in terms of current carrying capability and

device cooling capability.

When using SMD pads, the underlying copper traces should be at least 0.05 mm larger (on each edge) than the

Solder Mask window, in order to accommodate any layer to layer misalignment (i.e. 0.1 mm in X & Y).

For smaller signal type leads around the edge of the device, Infineon recommends that these are Non Solder

Mask Defined (NSMD) or Copper Defined.

When using NSMD pads, the Solder Resist Window should be larger than the Copper Pad by at least 0.025 mm

on each edge, (i.e. 0.05 mm in X&Y,) in order to accommodate any layer to layer misalignment.

Ensure that the solder resist in-between the smaller signal lead areas is at least 0.15 mm wide, due to the high

x/y aspect ratio of the solder mask strip.

Recommendations are shown in Figure 39 and Figure 40.

Final Datasheet

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V2.2

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

PCB footprint and layout recommendations

Figure 39

PCB copper and solder resist (pad sizes)

Figure 40

PCB copper and solder resist (pad spacing)

16.4

PCB solder paste stencil

Stencils for PQFN packages can be used with thicknesses of 0.100-0.250 mm (0.004-ꢂ.ꢂꢉꢂꢃꢅ. Stencils thinner

than 0.100 mm are unsuitable because they deposit insufficient solder paste to make good solder joints with

the ground pad; high reductions sometimes create similar problems. Stencils in the range of 0.125 mm-0.200

mm (0.005-ꢂ.ꢂꢂꢋꢃꢅ, with suitable reductions, give the best results.

A recommended stencil design is shown in Figure 41 and Figure 42. This design is for a stencil thickness of 0.127

mm ꢈꢂ.ꢂꢂꢄꢃꢅ. The reduction should be adjusted for stencils of other thicknesses.

Final Datasheet

57 of 64

V2.2

Feb 6 2019

IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

PCB footprint and layout recommendations

Figure 41

Solder paste stencil (pad sizes)

Figure 42

Solder paste stencil (pad spacing)

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Marking and package information

17

Marking and package information

17.1

Final production marking

Figure 43

Package marking

17.2

Early production marking

Figure 44

Package marking

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Marking and package information

17.3

Package dimensions

Package dimensions are shown in Figure 45 through Figure 47.

Figure 45

Package dimensions

Final Datasheet

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V2.2

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Marking and package information

Figure 46

Package dimensions

Figure 47

Package dimensions

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Environmental Qualifications

18

Environmental Qualifications

Table 14

Qualification Level

Industrial

Moisture Sensitivity

5mm x 7mm PQFN

MSL 2 260C

Human Body Model

(JESD22-A114-F)

JEDEC Class 1C

ESD

Charged Device Model

(JESD22-C101-F)

JEDEC Class 3

RoHS Compliant

Yes (with Exemption 7a)

Final Datasheet

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IRꢀ8ꢁꢂꢃ OptiMOS™ iPOL

30A Single-voltage Synchronous Buck Regulator with SVID

Table of contents

19

References

[1] UN7005 IR3816x_ PMBus™ Command Set

[2] Application Note AN-1162. Compensator Design Procedure for Buck Converter with Voltage-Mode Error-

Amplifier.

[3] Application Note AN-ꢉꢉꢊꢀ. SupIRBuck™ Multi-Chip Module (MCM) Power Quad Flat No-Lead (PQFN)

Board Mounting Application Note.

Final Datasheet

63 of 64

V2.2

Feb 6 2019


型号：	IR38164M
厂家：	Infineon
描述：	OptiMOS™ IPOL DC-DC转换器，单输入电压，30A降压稳压器，配备SVIDO DC-DC转换器稳压器
文件：	总64页 (文件大小：1869K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

IR38164M [INFINEON]

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