PT7712C_技术文档

PT7712—3.3V

20-A Programmable

Integrated Switching Regulator

SLTS088A

(Revised 6/27/2002)

Features

• 3.3V Input Voltage

• 20-A Output Current

• 4-Bit Programmable Output:

1.3V to 2.05V

• 27-Pin Space-Saving Package

• Solderable Copper Case

• Compatible with PT7744

20A “Current Booster”

• High Efficiency (87%)

• Differential Remote Sense

• Over-Current Protection

Ordering Information

Description

Pin-Out Information

Pin Function

PT 7712o = 1.3 to 2.05 Volts

PT 7744o = 20-A Booster *

Pin Function

The PT7712 Excalibur™ power module

is a 20-A integrated switching regulator

(ISR) housed a 27-pin space-saving

copper package. Operating from a 3.3V

input bus, the PT7712 produces a tightly

regulated output voltage that is program-

mable over the range, 1.3V to 2.05V.

The output voltage is selected via a

4-bit code, which is compatible with the

VRM specifications defined by Intel®.

This regulator is most suitable for

microprocessor and DSP applications

requiring core or I/O logic supply voltages

as low as 1.3V.

15 GND

16 GND

17 GND

18 GND

19 GND

1

VID0

2

VID1

* Consult the related application note for

information on current booster operation.

3

VID2

4

VID3

5

STBY *

No Connect

PT Series Suffix

(PT1234x)

20

21

22

23

24

25

V

out

V

out

V

out

V

out

V

out

V

out

6

Case/Pin

O rder

Package

7

V

in

V

in

V

in

V

in

V

in

Configuration Suffix

Code

†

8

9

Vertical

Horizontal

SMD

N

A

C

(ENE)

(ENF)

(ENG)

10

11

†

Previously known as package styles

1420 & 1430

26 Rem Sense V_out

12 Rem Sense Gnd

13 GND

27 Sync Out

(Reference the applicable package code

drawing for the dimensions and PC

board layout)

The PT7712 incorporates output

short-circuit protection, and a differential

remote sense to compensate for voltage

drop between the regulator and load.

14 GND

For STBY* pin: open =output enabled

ground =output disabled.

Standard Application

PROGRAMMING PINS

VID0

VID1

VID2

VID3

REMOTE SENSE(+)

4

3

2

1

26

12

L1

V_OUT

7-11

20-25

V_IN

PT7712

1µH

L

O

A

D

+

27

5

13-19

+

C_IN

C_OUT

SYNC OUT

GND

REMOTE SENSE(–)

STBY*

C_in= Required 1500µF electrolytic

C_out= Required 330µF electrolytic

L₁= Optional 1µH input choke

For technical support and more information, see inside back cover or visit www.ti.com

PT7712—3.3V

20-A Programmable

Integrated Switching Regulator

Programming Information

PT7710 Product Family Comparison

Input

Adjust

Output

Range

VID3 VID2 VID1 VID0

Vout

Product

Voltage

Description Method

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1.30V

1.35V

1.40V

1.45V

1.5V

PT 7711

5V

3.3V

5V

VID

5-Bit

4-Bit

5-Bit

—

1.3V– 3.5V

1.3V– 2.05V

1.8V– 2.55V

0.8V–1.575V

1.075V–1.85V

—

PT 7712

PT 7713

PT 7714

PT 7715

PT 7716

PT 7744

PT 7745

VID

1.55V

1.60V

1.65V

1.70V

1.75V

1.80V

1.85V

1.90V

1.95V

2.00V

2.05V

VID

3.3V

5V

VID

Booster

—

Logic 0 = Pin 12 potential (remote sense gnd)

Logic 1 = Open circuit (no pull-up resistors)

VID3 must not be changed while the unit is operating.

Specifications (Unless otherwise stated, T_a=25°C, V_in=3.3V, C_in=1,500µF, C_out=330µF, V_o=1.8V, and I_o=I_omax)

PT7712

Characteristics

Symbols

Conditions

Min

Typ

Max

Units

(1)

Output Current

Io

Ta = +25°C, Natural convection

Ta = +60°C, 200 LFM, pkg N

0.1

—

20

19

A

Input Voltage Range

Set-Point Voltage Tolerance

Temperature Variation

Line Regulation

Vin

Over I_orange

3.1

—

10

3.6

V

(2)

V_otol

Reg_temp

Regline

Regload

∆V_otol

All output voltages

–40°C ≤T_a≤+85°C, I_o=I_omin

Over Vin range

25

mV

%V_o

mV

0.75

—

5

Load Regulation

Over I_orange

Total Output Voltage Variation

Includes set-point, line, load,

—

1

3

%V_o

%

–40°C ≤T_a≤+85°C

Efficiency

η

I^o=10A

Vo =1.8V

Vo =1.5V

—

87

85

—

I^o=20A

Vo =1.8V

Vo =1.5V

—

83

81

—

%

Vo Ripple (pk-pk)

Vr

20MHz bandwidth

—

50

—

mV_pp

µSec

mV

A

Transient Response

ttr

1A/µs load step, 50% and 100% I_omax

Vo over/undershoot

—

Vos

I_TRIP

ƒo

—

100

—

Over-Current Threshold

Switching Frequency

Reset followed by auto-recovery

Over Vin range

—

32

—

300

350

400

kHz

STBY* Input Requirements

Input High Voltage

Referenced to GND

(3)

Open

0.8

—

V_IH

V_IL

I_IL

2.0

—

V

-0.2

Input Low Voltage

Input Low Current

Pin 5 to GND

—

0.3

30

—

mA

µF

°C

Standby Input Current

External Capacitance

Operating Temperature Range

Storage Temperature

Mechanical Shock

I_instandby

—

(4)

C_out

Ta

330

–40

-40

15,000

(5)

Over Vin Range

—

+85

Ts

+125

—

Per Mil-STD-883D, Method 2002.3

1 msec, Half Sine, mounted to a fixture

—

500

—

G’s

(6)

Mechanical Vibration

—

Mil-STD-883D, Method 2007.2 Suffixes N, A

—

20

15

—

G’s

20-2000 Hz

Suffix C

Weight

—

Vertical/Horizontal

Materials meet UL 94V-0

—

36

—

grams

Flammability

Notes: (1) ISR-will operate down to no load with reduced specifications.

(2) If the remote sense ground is not used, pin 12 must be connected to pin 13 for optimum output voltage accuracy.

(3) The STBY* control (pin 5) has an internal pull-up. If it is left open-circuit, the module will operate when input power is applied. A low-leakage (<1µA)

MOSFET must be used to control this pin. The open-circuit voltage may be as high as Vin.

(4) For operation below 0°C, Cin and Cout must have stable characteristics. Use either low ESR tantalum or Oscon® capacitors.

(5) See safe Operating Area curves or consult factory for the appropriate derating.

(6) The case pins on the through-hole package types (suffixes N & A) must be soldered. For more information see the applicable package outline drawing.

External Capacitors: The regulator requires a minimum output capacitance of 330µF for proper operation. An input capacitance of 1500µF is also required. This

must be rated for a minimum of 1.4Arms of ripple current. For transient or dynamic load applications, additional capacitance may be required. For further informa-

tion refer to the application note regarding capacitor selection for this product.

Input Filter: An input filter inductor is optional for most applications. The inductor must be sized to handle 20ADC with a typical value of 1µH.

For technical support and more information, see inside back cover or visit www.ti.com

Typical Characteristics

PT7712—3.3V

20-A Programmable

Integrated Switching Regulator

Performance Characteristics, V_in=3.3V (See Note A)

Safe Operating Area Curves (See Note B)

PT7712, V_in=3.3V

Efficiency vs Output Current

100

90

80

70

60

50

40

30

20

90

80

70

60

50

Airflow

V_OUT

200LFM

120LFM

60LFM

1.8V

1.5V

Nat conv

0

4

8

12

16

20

0

4

8

12

16

20

Iout (A)

Ripple vs Output Current

50

40

30

20

10

0

V_OUT

1.5V

1.8V

0

4

8

12

16

20

Iout (A)

Power Dissipation vs Output Current

10

8

V_OUT

6

1.8V

1.5V

4

2

0

4

8

12

16

20

Iout (A)

Note A: All characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical for the ISR.

Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperatures.

For technical support and more information, see inside back cover or visit www.ti.com

Application Notes

PT7710 Family, PT7744/PT7745

Tantalum Characteristics

Capacitor Recommendations for the PT7710

Series of Regulators and Current Boosters

Tantalum capacitors with a minimum 10-V rating are

recommended on the output bus, but only the AVX TPS

Series, Sprague 594/595 Series, or Kemet T495/T510

Series. These AVX, Sprague, and Kemet capacitors are

specified over other types due to their higher surge cur-

rent, excellent power dissipation and ripple current ratings.

As a caution, the TAJ Series by AVX is not recommended.

This series exhibits considerably higher ESR, reduced power

dissipation and lower ripple current capability. The TAJ

series is also less reliable compared to the TPS series when

determining power dissipation capability.

Input Capacitors

The recommended input capacitance is determined by the

1.4 ampere minimum ripple current rating and 1500µF

minimum capacitance. Capacitors listed below must be

rated for a minimum of twice (2×) the input voltage with

+5V operation. Ripple current and ≤100mΩ Equivalent

Series Resistance (ESR) values are the major consider-

ations along with temperature when selecting the proper

capacitor.

Output Capacitors

Capacitor Table

The minimum required output capacitance is 330µF with

a maximum ESR less than or equal to 100mΩ. Failure to

observe this requirement may lead to regulator instability or

oscillation. Electrolytic capacitors have poor ripple perfor-

mance at frequencies greater than 400kHz, but excellent low

frequency transient response. Above the ripple frequency

ceramic decoupling capacitors are necessary to improve the

transient response and reduce any microprocessor high

frequency noise components apparent during higher current

excursions. Preferred low ESR type capacitor part numbers

are identified in the Table 1-1 below.

Table 1-1 identifies the characteristics of capacitors from a

number of vendors with acceptable ESR and ripple current

(rms) ratings. The suggested minimum quantities per

regulator for both the input and output buses are identified.

This is not an extensive capacitor list. Capacitors from

other vendors are available with comparible specifications.

The RMS ripple current rating and ESR (Equivalent Series

Resistance at 100kHz) are the critical parameters necessary

to insure both optimum regulator performance and long

capacitor life.

Table 1-1 Capacitors Characteristic Data

Capacitor

Vendor/

Series

Capacitor Characteristics

Quantity

Working

Voltage

Value(µF)

(ESR) Equivalent

Series Resistance

105°C Maximum

Ripple

Physical

Size(mm)

Input

Bus

Output

Bus

Vendor Number

Current(Irms)

Panasonic

FC (SMT)

16V

35V

2200

330

0.038Ω

0.065Ω

2000mA

1205mA

18x16.5

12.5x16.5

1

EEVFC1C222N

EEVFC1V331LQ

FC (Radial)

10V

16V

560

1800

0.090Ω

0.032Ω

755mA

2000mA

10x12.5

18x15

1

EEUFC1A561

EEUFC1C182S

1

United

Chemi -Con

LFZ Series

25V

16V

330

1500

470

0.090Ω

0.038Ω

0.090Ω

760mA

1660mA

760mA

10x12.5

12.5x20

10x12.5

1

LXZ25VB331M10X12LL

LXZ16VB222M12X20LL

LXZ16VB471M10X12LL

Nichicon

PL Series

PM Series

10V

25V

680

1800

330

0.090Ω

0.044Ω

0.095Ω

770mA

1420mA

750mA

10x15

16x15

10x15

1

UPL1A681MHH6

UPL1A182MHH6

UPL1E331MPH6

1

Oscon

SS (Radial)

SVP (SMT)

10V

330

0.025Ω÷4 =0.006Ω

0.02Ω÷4 =0.005Ω

>9800mA

10x10.5

9x8.3

4

N/R

10SS330M

(Note) 10SVP330M

AVX

Tanatalum

TPS- Series

10V

330

0.1Ω÷5 =0.02Ω

0.06Ω

3500mA

1826mA

7.3Lx

4.3Wx

4.1H

5

1

TPSV337M010R0100

TPSV337M010R0060

Sprague

Tantalum

595D/594D

10V

330

680

0.045Ω÷4 =0.011Ω

0.09Ω

>4500mA

>1660mA

7.3L x

5.7W x

4.0H

5

2

1

594D337X0010R2T

595D687X0010R2T

(Surface Mount)

Kemet

10V

330

220

0.035Ω

2000mA

4.3Wx7.3L

x4.0H

5

6

1

2

510X337M010AS

Tantalum

T510/T495

Series

0.07Ω÷2 =0.035Ω

>2000mA

T495X227M010AS

(Surface Mount)

Sanyo Poscap

TPB

10V

220

0.04Ω

3000mA

7.2L x

4.3W x

3.1H

6

2

10TPB220M

(Surface Mount)

Note: (N/R) is not recommended for this application, due to extremely low Equivalent Series Resistance (ESR)

For technical support and more information, see inside back cover or visit www.ti.com

Application Notes

PT7710 Series, PT7744, PT7745

Increasing the Output of the PT7710 Family of

ISRs with a 20-A Compatible Current Booster

Notes:

1. Each booster requires the same amount of input and

output capacitance as recommended for a stand-alone

regulator. Consult the individual data sheet of the

applicable regulator, and the related application note

regarding capacitor selection for this product family.

The output of PT7710 family of regulators (PT7711–

PT7716) can produce an additional 20-A output using a

compatible current booster module. Two booster modules

are available. They are the PT7744 and PT7745, which

are compatible with regulators that operate off 3.3-V

or 5-V input buses respectively. Refer to Table 2-1 for

regulator/booster compatiblity.

2. The 1-µH filter choke located at the input of each

regulator and booster module (L_in) is optional for most

applications. If specified, each inductor must be sized

to handle 20ADC at full output load.

The booster modules are controlled directly by the regu-

lator and effectively add a parallel output stage. They

operate sychronously, to provide a low-noise solution.

Up to two booster modules can be connected to a PT771x

regulator. Each booster added increases the regulator’s

output current by 20A, for up to 60A of output current.

3. The pin-out of the current booster modules include a

number pins identified, “No Connect” (see Table 2-2).

These pins are not connected internally to the module

but must be soldered to a pad to preserve the unit’s

mechanical integrity.

Current boosters are not stand-alone products, and can

only operate with a regulator. They are housed in the same

package as the regulator, and share the same mechanical

outline. Except for an increase in output current, the

overall performance of a regulator/booster combination

is identical to that of a stand-alone regulator. For more

details refer to the applicable regulator specifications.

4. A similar PCB footprint and trace layout between the

regulator and each booster will facilitate current sharing

between all modules.

Table 2-2; Booster Pin-Out Information

Pin Function

10 V_in

11 V_in

12 No Connect

13 GND

14 GND

15 GND

16 GND

17 GND

18 GND

Pin Function

19 GND

20 V_out

Table 2-1; Booster Compatibility

1

2

3

4

5

6

7

8

9

No Connect

V_in

P7744 Booster

(3.3V Input Bus)

PT7745 Booster

(5V Input Bus)

Regulator

PT7711

PT7712

PT7713

PT7714

PT7715

PT7716

21 V_out

•

22 V_out

23 V_out

•

24 V_out

25 V_out

V_in

26 No Connect

27 Sync In

•

Figure 1-1; Current Booster Application Schematic

PROGRAMMING PINS

VID0

VID1

VID2

VID3

VID4

REMOTE SENSE (+)

6

4

3

2

1

26

VID4

-

VID0

SNS(+)

L_IN

V_{O U T}

7-11

20-25

V_IN

V_O

PT771x

1µH

Synch

Out

+

STBY

GND

13-19

SNS(-)

12

C _IN

C _{O U T}

LOAD

5

27

G N D

STBY*

REMOTE SENSE (–)

27

Synch In

L_IN

PT7744/45

Booster

7-11

20-25

V_O

V_IN

1µH

+

GND

C _IN

C _{O U T}

13-19

For technical support and more information, see inside back cover or visit www.ti.com

Application Notes

PT7710 Family

Using the Standby Function on the PT7710

Excalibur™ Series of 20-A ISRs

Figure 3-1

For applications requiring On/Off control of the output

voltage, the PT7710 family of Excalibur ISRs incorpo-

rate a standby function. This feature may be used for

power-up/shutdown sequencing, or to change the output

voltage while input power is applied. See related notes:

“Pin-Coded Output Voltage Adjustment of the PT7710

Excalibur™ Series of 20-A ISRs.”

6

4

3

2

1

26

VID4

-

VID0

Rem Sns (+)

20-25

7-11

Vin

Vo

5V

V _o=3.3V

PT7711

Synch

Out

STBY

5

GND

13-19

Rem Sns (–)

27

12

The standby function is provided by the STBY* control,

pin 5. If pin 5 is left open-circuit the regulator operates

normally, providing a regulated output whenever a valid

supply voltage is applied to V_in(pins 7-11) with respect to

L

O

A

D

+

C _in

C _out

Q1

BSS138

Inhibit

C O M

1

GND (pins 13-19). Connecting pin 5 to ground will set

2

the regulator output to zero volts . This places the regu-

C O M

lator in standby mode, and reduces the input current to

typcially 30mA (60mA max). If a ground signal is applied

to pin 5 prior to power-up, the regulator output will be

held at zero volts during the period that input power is

applied.

Turn-On Time: Turning Q₁in Figure 3-1 off, removes the

low-voltage signal at pin 5 and enables the output. After

a delay of approximately 10ms, the output voltage of a

PT771x regulator rises to full regulation within 30ms ³.

Figure 3-2 shows the typical output voltage waveform of

a PT7711 following the turn-off of Q₁at time t =0 secs.

The output voltage in Figure 3-1 is set to 3.3V by connecting

VID0 (pin 1), VID2 (pin 3), and VID3 (pin 4) to the ‘Rem

The standby input must be controlled with an open-

collector (or open-drain) discrete transistor (See Figure 1).

Table 3-1 gives the input requirements.

Table 3-1 Standby Control Input Requirements ^{(1, 2)}

Parameter

Min

Typ

Max

1

Enable

Disable

2V

–0.2V

Open Cct.

0.8V

*

Sense Gnd’ (pin 12) . The waveform was measured with a

+5V input source voltage, and 10-A resistive load.

I_{stby (low)}

Vstby (o/c)

0.5mA

V_in

Notes:

Figure 3-2

1. The Standby input on the PT7710 regulator family must

be controlled using an open-collector (or open-drain)

discrete transistor. Do Not use a pull-up resistor. The

control input has an open-circuit voltage equal to V_in. To

set the regulator output to zero, the control pin must be

“pulled” to less than 0.8Vdc with a 0.5mA sink to ground.

V_o(2V / Div)

2. When placed in the standby mode, the regulator output

discharges the output capacitance with a low impedance to

ground.

I_in10A / Div)

3. The turn-off time of Q₁, or rise time of the standby input

is not critical with the PT7710 family. Turning Q₁off

slowly, over periods up to 100ms, will not affect regulator

operation. However, a slow turn-off time will increase

both the initial delay and rise-time of the output voltage.

0

5

10

15

20

25

30

t (milli - secs)

*

Consult the data sheet for details on other VID codes.

For technical support and more information, see inside back cover or visit www.ti.com

Application Notes

PT7710 Family

Pin-Coded Output Voltage Adjustment of the

4. If active devices are used to ground the voltage control

pins, low-level open drain MOSFET devices should be

used over bipolar transistors. The inherent V_ce(sat) in

bipolar devices introduces errors in the device’s internal

divider network. Discrete transistors such as the BSS138,

2N7002, or IRLML2402 are examples of appropriate

devices.

PT7710 Excalibur™ Series of 20-A ISRs

The PT7710 Excalibur™ family of converters incorporate

a pin-coded control to adjust the output voltage. This

feature uses the control pins VID0–VID4 (pins 1–6).

When the control pins are left open-circuit, the ISR

output regulates at its default output voltage. Each

control pin is internally connected to a precision resistor,

which when grounded applies a weighted change to the

output voltage. By selectively grounding VID0–VID4,

the output voltage of these ISRs can be programmed in

incremental steps over the specified output voltage range.

The program codes and output voltage range offered by

these ISRs are compatible with the Voltage ID specifica-

tions defined by Intel Corporation for VRMs (voltage

regulator modules). The codes are used by both the

Pentium® and Athlon® microprocessors. Refer to

Figure 4-1 for the connection schematic, and the respective

device Data Sheet for the programming code information.

Active Voltage Programming:

Special precautions should be taken when making changes

to the output voltage progam code while the unit is

powered. This activity can induce current transients

through the device as a result of the electrolytic output

capacitors being either charged or discharged to the new

output voltage set-point. The transient current can be

minimized by making only incremental changes to the

binary code, i.e. one LSB at a time. A minimum of 100µs

settling time between each program state is also recom-

mended. Making non-incremental changes to VID3 or

VID4 is discouraged.

When active devices are used to program the output

voltage, their state should be asserted prior to the input

power being applied. An alternative is to pull pin 5 (STBY)

control to GND during the application of input voltage,

then assert the required program code and release pin 5.

The module will then intiate a soft-start power-up to the

desired program voltage. For more information on the

use of the Standby function, consult the related applica-

tion note, “Using the Standby Function on the PT7710

Excalibur™ Series of 20-A ISRs.”

Notes:

1. The programming convention is as follows:-

Logic 0:

Logic 1:

Connect to pin 12 (Remote Sense Ground).

Open circuit/open drain (See notes 2, & 4)

2. Do not connect pull-up resistors to the voltage

programming pins.

3. Use pin 12 (Remote Sense Ground) as the logic “0”

reference. While the regular ground (pins 13-19) can also

be used for programming, doing so will degrade the load

reglation of the product. If the remote sense ground is

not used, pin 12 must be connected to pin 13 for

optimum output voltage accuracy.

Figure 4-1

6

4

3

2

1

26

VID4 - VID0

SNS(+)

20-25

7-11

Vin

Vo

+5V

PT7710

1µH

Synch

Out

(Optional)

STBY

5

GND

13-19

SNS(-)

12

27

L

O

A

D

+

C_in

C_out

STBY

COM

For technical support and more information, see inside back cover or visit www.ti.com

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型号：	PT7712C
厂家：	TEXAS INSTRUMENTS
描述：	暂无描述稳压器开关
文件：	总8页 (文件大小：160K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

PT7712C [TI]

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