PTH03020WAS [TI]

22-A, 3.3-V Input Non-Isolated Wide-Output Adjust Power Module;


型号：	PTH03020WAS
厂家：	TEXAS INSTRUMENTS
描述：	22-A, 3.3-V Input Non-Isolated Wide-Output Adjust Power Module
文件：	总19页 (文件大小：515K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

PTH03020W —3.3-V Input

22-A, 3.3-V Input Non-Isolated

Wide-Output Adjust Power Module

SLTS206C – MAY 2003 – REVISED DECEMBER 2003

Features

• Up to 22-A Output Current

• 3.3-V Input Voltage

• Auto-Track™ Sequencing

• Output Over-Current Protection

(Non-Latching, Auto-Reset)

• Over-Temperature Protection

• Operating Temp: –40 to +85 °C

• IPC Lead Free 2

• Safety Agency Approvals:

UL 1950, CSA 22.2 950, EN60950

VDE (Pending)

• Point-of-load Alliance (POLA)

Compatible

• Wide-Output Voltage Adjust

(0.8 V to 2.5 V)

• Efficiencies up to 93 %

• 120 W/in³ Power Density

• On/Off Inhibit

• Output Voltage Sense

• Pre-Bias Startup

• Margin Up/Down Controls

• Under-Voltage Lockout

NOMINAL SIZE =

1.5 in x 0.87 in

(38,1 mm x 22,1 mm)

Description

Pin Configuration

This series includes Auto-Track™.

Auto-Track simplifies the task of supply

voltage sequencing in a power system by

enabling modules to track each other, or

any external voltage, during power up and

power down.

Other operating features include an

on/off inhibit, output voltage adjust (trim),

and margin up/down controls. To ensure

tight load regulation, an output voltage

sense is also provided. A non-latching

over-current trip and over-tempterature

shutdown provide load fault protection.

Target applications include complex

multi-voltage, multi-processor systems

that incorporate the industry’s high-speed

DSPs, micro-processors and bus drivers.

The PTH03020 series of non-isolated

power modules offers OEM designers a

combination of high performance, small

footprint, and industry leading features.

As part of a new class of power modules

these products provide designers with the

flexibility to power the most complex

multi-processor digital systems using

off-the-shelf catalog parts.

The series employs double-sided surface

mount construction and provides high-

performance step-down power conversion

for up to 22 A of output current from a

3.3-V input bus voltage. The output volt-

age of the PTH03020W can be set to

any value over the range, 0.8 V to 2.5 V,

using a single resistor.

Pin Function

GND

V_in

Inhibit *

V_oAdjust

V_oSense

V_out

GND

Track

Margin Down *

10 Margin Up *

Denotes negative logic:

Open

= Normal operation

Ground = Function active

Standard Application

Required to set the output voltage to a value

higher than 0.8 V. (See spec. table for values)

set

Track

Required electrolytic 1,000 µF

Recommended 330 µF electrolytic

out

Margin Down

Margin Up

PTH03020W

(Top View)

V_IN

V_OUT

Inhibit

V_oSense

R_SET(Required)

0.1 W, 1 %

⁺C_IN

1,000 µF

(Required)

⁺C_OUT

330 µF

(Optional)

GND

For technical support and further information, visit http://power.ti.com

PTH03020W —3.3-V Input

22-A, 3.3-V Input Non-Isolated

Wide-Output Adjust Power Module

SLTS206C – MAY 2003 – REVISED DECEMBER 2003

Ordering Information

(1)

Output Voltage

(PTH03020rxx)

Package Options

(PTH03020xrr)

(2)

Code

Voltage

0.8 V – 2.5 V (Adjust)

Code

Description

Horiz. T/H

SMD, Standard

Pkg Ref.

(EUK)

(EUL)

(3)

Notes: (1) Add “T” to end of part number for tape and reel on SMD packages only.

(2) Reference the applicable package reference drawing for the dimensions and PC board layout

(3) “Standard” option specifies 63/37, Sn/Pb pin solder material.

Pin Descriptions

Vin: The positive input voltage power node to the mod-

Vo Sense: The sense input allows the regulation circuit to

compensate for voltage drop between the module and

the load. For optimal voltage accuracy Vo Sense should

be connected to Vout. It can also be left disconnected.

ule, which is referenced to common GND.

Vout: The regulated positive power output with respect

to the GND node.

Track: This is an analog control input that enables the

output voltage to follow an external voltage. This pin

becomes active typically 20 ms after the input voltage

has been applied, and allows direct control of the output

voltage from 0 V up to the nominal set-point voltage.

Within this range the output will follow the voltage at

the Track pin on a volt-for-volt basis. When the control

voltage is raised above this range, the module regulates

at its set-point voltage. The feature allows the output

voltage to rise simultaneously with other modules pow-

ered from the same input bus. If unused, the input should

be connected to V_in. Note: Due to the under-voltage lockout

feature, the output of the module cannot follow its own input

voltage during power up. For more information, consult the

related application note.

GND: This is the common ground connection for the

Vin and Vout power connections. It is also the 0 VDC

reference for the control inputs.

Inhibit: The Inhibit pin is an open-collector/drain negative

logic input that is referenced to GND. Applying a low-

level ground signal to this input disables the module’s

output and turns off the output voltage. When the Inhibit

control is active, the input current drawn by the regula-

tor is significantly reduced. If the Inhibit pin is left

open-circuit, the module will produce an output when-

ever a valid input source is applied.

Vo Adjust: A 0.1 W, 1 % tolerance (or better) resistor

must be connected between this pin and the GND pin to

set the output voltage to the desired value. The set point

range for the output voltage is from 0.8 V to 2.5 V. The

resistor required for a given output voltage may be cal-

culated from the following formula. If left open circuit,

the module output will default to its lowest output voltage

value. For further information on the adjustment of the

output voltage consult the related application note.

Margin Down: When this input is asserted to GND, the

output voltage is decreased by 5% from the nominal. The

input requires an open-collector (open-drain) interface.

It is not TTL compatible. A lower percent change can

be accomodated with a series resistor. If unused, this

input may be left unconnected. For further informa-

tion, consult the related application note.

Margin Up: When this input is asserted to GND, the

output voltage is increased by 5%. The input requires an

open-collector (open-drain) interface. It is not TTL

compatible. The percent change can be reduced with a

series resistor. If ununsed, this input may be left un-

connected. For further information, consult the related

application note.

0.8 V

V_out– 0.8 V

R_set

= 10 k ·

– 2.49 k

The specification table gives the preferred resistor values

for a number of standard output voltages.

For technical support and further information, visit http://power.ti.com

PTH03020W —3.3-V Input

22-A, 3.3-V Input Non-Isolated

Wide-Output Adjust Power Module

SLTS206C – MAY 2003 – REVISED DECEMBER 2003

Environmental & Absolute Maximum Ratings (Voltages are with respect to GND)

Characteristics

Symbols

Conditions

Min

Typ

Max

Units

Track Input Voltage

V_track

–0.3

–40

—

V_in+ 0.3

Operating Temperature Range

Solder Reflow Temperature

Storage Temperature

Over V Range

Surface temperature of module body or pins

—

Per Mil-STD-883D, Method 2002.3

1 msec, ½ Sine, mounted

°C

(i)

T_reflow

235

–40

—

125

Mechanical Shock

500

—

G’s

Mechanical Vibration

Mil-STD-883D, Method 2007.2

20-2000 Hz

Suffix H

Suffix S

—

G’s

Weight

Flammability

—

grams

Meets UL 94V-O

Notes: (i) During reflow of SMD package version do not elevate peak temperature of the module, pins or internal components above the stated maximum.

Specifications (Unless otherwise stated, T_a=25 °C, V_in=3.3 V, V_out=2 V, C_in=1,000 µF, C_out=0 µF, and I_o=I_omax)

PTH03020W

Characteristics

Symbols

Conditions

Min

Typ

Max

Units

(1)

Output Current

I_o

60 °C, 200 LFM airflow

25 °C, natural convection

—

(2)

Input Voltage Range

Set-Point Voltage Tolerance

Temperature Variation

Line Regulation

Load Regulation

Total Output Variation

V_in

V_otol

∆Reg_temp

∆Reg_line

∆Reg_load

∆Reg_tot

Over I_orange

2.95

—

0.5

3.65

—

(3)

%V_o

–40 °C <T_a< +85 °C

Over V_inrange

Over I_orange

Includes set-point, line, load,

–40 °C ≤ T_a≤ +85 °C

(3)

—

%V_o

Efficiency

I_o=10 A

R_SET= 2.21 kΩ V_o= 2.5 V

—

R_SET= 4.12 kΩ V_o= 2.0 V

R_SET= 5.49 kΩ V_o= 1.8 V

R_SET= 8.87 kΩ V_o= 1.5 V

R_SET= 17.4 kΩ V_o= 1.2 V

R_SET= 36.5 kΩ V_o= 1.0 V

V_o

Ripple

(p2k0-pMk)HVz bandwidth

Reset, followed by auto-recovery

1 A/µs load step, 50 to 100 % I_omax,

C_out=330 µF

—

mVpp

Over-Current Threshold

Transient Response

I_otrip

t_tr

Recovery Time

V_oover/undershoot

—

µSec

∆V_tr

100

Margin Up/Down Adjust

V_oadj

_ILm(painrgsin

Currternatck

—

– 8

—

–130

µA

(4)

Margin

Track

Input

Current

9Pin to G/N10D)I

Pin(tpoinGND

(5)

8)I

Track Slew Rate Capability

Under-Voltage Lockout

dV_track/dt

UVLO

_out≤ C_out(max)—

—

V/ms

V_inincreasing

V_indecreasing

eferenced to GND

—

2.8

2.7

2.95

—

2.2

Inhibit

Control

V_IH

(pin3)R

(5)

(8)

Input High Voltage

Input Low Voltage

V_in–0.5

–0.2

—

250

1,000

—

–130

300

—

330 (

—

Open

0.8

—

340

—

V_IL

I_ILinhibit

Input Low Current

Pin to GND

Inhibit (pin 3) to GND, Track (pin 8) open

Over V_inand I_oranges

µA

Input Standby Current

Switching Frequency

External Input Capacitance

External Output Capacitance

I_ininh

ƒ_s

C_in

kHz

µF

(6)

C_out

Capacitance value

non-ceramic

ceramic

11,000

300

µF

(9)

Equiv.

series

resistance

—

(no—n-ceramic)4 mΩ

Reliability

MTBF

Per Bellcore TR-332

4.9

—

10 Hrs

50 % stress, T_a=40 °C, ground benign

Notes: (1) See SOA curves or consult factory for appropriate derating.

(2) The minimum input voltage is equal to 2.95 V or Vout + 0.5 V, whichever is greater.

(3) The set-point voltage tolerance is affected by the tolerance and stability of R_SET. The stated limit is unconditionally met if R_SEThas a tolerance of 1 %

with 100 ppm/°C or better temperature stability.

(4) A small low-leakage (<100 nA) MOSFET is recommended to control this pin. The open-circuit voltage is less than 1 Vdc.

(5) This control pin has an internal pull-up to the input voltage Vin. If it is left open-circuit the module will operate when input power is applied. A small

low-leakage (<100 nA) MOSFET is recommended for control. For further information, consult the related application note.

(6) A 1,000 µF electrolytic input capacitor is required for proper operation. The capacitor must be rated for a minimum of 700 mArms of ripple current.

(7) An external output capacitor is not required for basic operation. Adding 330 µF of distributed capacitance at the load will improve the transient response.

(8) This is the calculated maximum. The minimum ESR limitation will often result in a lower value. Consult the application notes for further guidance.

(9) This is the typcial ESR for all the electrolytic (non-ceramic) output capacitance. Use 7 mΩ as the minimum when using max-ESR values to calculate.

For technical support and further information, visit http://power.ti.com

PTH03020W —3.3-V Input

22-A, 3.3-V Input Non-Isolated

Wide-Output Adjust Power Module

SLTS206C – MAY 2003 – REVISED DECEMBER 2003

Characteristic Data; V_in=3.3V (See Note A)

Safe Operating Area; V_in=3.3 V (See Note B)

Efficiency vs Load Current

All Output Voltages

100

V_OUT

Airflow

2.5V

400LFM

200LFM

100LFM

Nat Conv

1.8V

1.5V

1.2V

1.0V

Iout - (A)

Iout (A)

Output Ripple vs Load Current

V_OUT

1.5V

1.8V

1.2V

1.0V

2.5V

Iout - (A)

Power Dissipation vs Load Current

Iout - (A)

Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the converter.

Note B: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures. Derating limits apply to

modules soldered directly to a 4 in. × 4 in. double-sided PCB with 1 oz. copper.

For technical support and further information, visit http://power.ti.com

Application Notes

PTH03020W & PTH05020W

Capacitor Recommendations for the PTH03020 &

PTH05020 Series of Power Modules

Input Capacitor

dissipation, and ripple current capability. As a caution

many general purpose tantalum capacitors have consider-

ably higher ESR, reduced power dissipation and lower

ripple current capability. These capacitors are also less

reliable when determining their power dissipation and

surge current capability. Tantalum capacitors that do

not have a stated ESR or surge current rating are not

recommended for power applications.

The recommended input capacitor(s) is determined by

the 1,000 µF ⁽¹⁾minimum capacitance and 700 mArms

minimum ripple current rating.

Ripple current and <100 mΩ equivalent series resistance

(ESR) values are the major considerations, along with

temperature, when designing with different types of

capacitors. Unlike polymer tantalum, conventional tan-

talum capacitors have a recommended minimum voltage

rating of 2 × (maximum DC voltage + AC ripple). This

is standard practice to insure reliability.

When specifying Os-Con and polymer tantalum capacitors

for the output, the minimum ESR limit will be encoun-

tered well before the maximum capacitance value is

reached.

For improved ripple reduction on the input bus, ceramic

capacitors may be substituted for electrolytic types using

the minimum required capacitance.

Capacitor Table

Table 2-1 identifies the characteristics of capacitors from a

number of vendors with acceptable ESR and ripple current

(rms) ratings. The recommended number of capacitors

required at both the input and output buses is identified

for each capacitor type.

Output Capacitors (Optional)

For applications with load transients (sudden changes in

load current), regulator response will benefit from an

external output capacitance. The recommended output

capacitance of 330 µF will allow the module to meet

its transient response specification (see product data sheet).

For most applications, a high quality computer-grade

aluminum electrolytic capacitor is most suitable. These

capacitors provide adequate decoupling over the frequency

range, 2 kHz to 150 kHz, and are suitable when ambient

temperatures are above 0 °C. For operation below 0 °C,

tantalum, ceramic or Os-Con type capacitors are recom-

mended. When using one or more non-ceramic capacitors,

the calculated equivalent ESR should be no lower than

4 mΩ (7 mΩ using the manufacturer’s maximum ESR

for a single capacitor). A list of preferred low-ESR type

capacitors are identified in Table 2-1.

This is not an extensive capacitor list. Capacitors from other

vendors are available with comparable specifications. Those

listed are for guidance. The RMS ripple current rating and

ESR (at 100kHz) are critical parameters necessary to insure

both optimum regulator performance and long capacitor life.

Designing for Very Fast Load Transients

The transient response of the DC/DC converter has been

characterized using a load transient with a di/dt of 1 A/µs.

The typical voltage deviation for this load transient is

given in the data sheet specification table using the

optional value of output capacitance. As the di/dt of a

transient is increased, the response of a converter’s regu-

lation circuit ultimately depends on its output capacitor

decoupling network. This is an inherent limitation with

any DC/DC converter once the speed of the transient

exceeds its bandwidth capability. If the target application

specifies a higher di/dt or lower voltage deviation, the

requirement can only be met with additional output

capacitor decoupling. In these cases special attention

must be paid to the type, value and ESR of the capacitors

selected.

Ceramic Capacitors

Above 150 kHz the performance of aluminum electrolytic

capacitors becomes less effective. To further improve the

reflected input ripple current or the output transient

response, multilayer ceramic capacitors can also be added.

Ceramic capacitors have very low ESR and their resonant

frequency is higher than the bandwidth of the regulator.

When used on the output their combined ESR is not

critical as long as the total value of ceramic capacitance

does not exceed 300 µF. Also, to prevent the formation of

local resonances, do not place more than five identical ce-

ramic capacitors in parallel with values of 10 µF or greater.

If the transient performance requirements exceed that

specified in the data sheet, or the total amount of load

capacitance is above 3,000 µF, the selection of output

capacitors becomes more important. For further guidance

consult the separate application note, “Selecting Output

Capacitors for PTH Products in High-Performance Applica-

tions.”

Tantalum Capacitors

Tantalum type capacitors can be used at both the input

and output, and are recommended for applications where

the ambient operating temperature can be less than 0 °C.

The AVX TPS, Sprague 593D/594/595 and Kemet T495/

T510 capacitor series are suggested over many other

tantalum types due to their higher rated surge, power

For technical support and further information, visit http://power.ti.com

Application Notes continued

PTH03020W & PTH05020W

Table 2-1: Input/Output Capacitors

Capacitor Vendor, Type

Series (Style)

Capacitor Characteristics

Quantity

Working

Voltage

Value(µF)

Max. ESR

at 100 kHz

105°C Maximum Physical Size

Input

Bus

Output

Bus

Vendor Part Number

Ripple

(mm)

Current (Irms)

Panasonic, Aluminum:

FC (Radial)

10 V

25 V

10 V

560

0.090 Ω

0.068 Ω

0060 Ω

0.080 Ω

755 mA

1050 mA

1100 mA

850 mA

10×12.5

10×16

12.5×13.5

10×10.2

EEUFC1A561

1000

EEUFC1A102

EEVFK1E102Q

EEVFK1A102P

FK (SMD)

United Chemi-con:

PXA, Poly-Aluminum (SMD)

FX, Os-con (Radial)

6.3 V

10 V

470

1000

680

0.020 Ω

0.013 Ω

0.090 Ω

0.068 Ω

4130 mA

4935 mA

760 mA

10×7.7

10×10.5

10×12.5

10×16

2 ⁽¹⁾

PXA6.3VC471MJ80TP

6FX1000M

LXZ10VB681M10X12LL

LXZ10VB102M10X16LL

≤3

≤2

LXZ, Aluminum (Radial)

1000

1050 mA

Nichicon, Aluminum:

HD (Radial)

PM (Radial)

UHD0J102MPR

UPM1A102MPH6

6.3 V

10 V

1000

0.053 Ω

0.065 Ω

1030 mA

1060 mA

10×12.5

16×15

Sanyo, Os-con:

SP (Radial)

SVP (SMD)

10 V

470

560

0.015 Ω

0.013 Ω

>4500 mA

>5200 mA

10×10.5

10×12.7

2 ⁽¹⁾

≤3

≤2

10SP470M

10SVP560M

Panasonic, Poly-Aluminum:

WA (SMD)

S/SE (SMD)

(1)

10 V

6.3 V

470

180

0.017 Ω

0.005 Ω

4500 mA

4000 mA

10×10.2

7.3×4.3×4.2

EEFWA1A471P

EEFSE0J181R

≤3

≤1

AVX, Tantalum:

TPS (SMD)

10 V

470

0.045 Ω

0.060 Ω

1723 mA

1826 mA

7.3L

×5.7W×4.1H

2 ⁽¹⁾

TPSE477M010R0045

TPSV477M010R0060

≤5

Kemet (SMD):

T520, Poly-Tant

T530, Poly-Tant/Organic

10 V

6.3 V

330

470

0.040 Ω

0.015 Ω

0.012 Ω

1800 mA

>3800 mA

4200 mA

4.3W

×7.3L

×4.0H

2 ⁽¹⁾

T520X337M010AS

T530X337M010AS

T530X477M006AS

≤5

≤3

≤2

Vishay-Sprague

595D, Tantalum (SMD)

94SA, Os-con (Radial)

7.2L×6W

×4.1H

16×25

10 V

16 V

470

1000

0.100 Ω

0.015 Ω

1440 mA

9740 mA

2 ⁽¹⁾

≤5

≤3

595D477X0010R2T

94SA108X0016HBP

Kemet, Ceramic X5R (SMD)

16 V

6.3 V

0.002 Ω

—

1210 case

3225 mm

C1210C106M4PAC

C1210C476K9PAC

≤5

Murata, Ceramic X5R (SMD)

6.3 V

16 V

100

0.002 Ω

—

1210 case

3225 mm

GRM32ER60J107M

GRM32ER60J476M

GRM32ER61C226K

GRM32DR61C106K

≤3

≤5

TDK, Ceramic X5R (SMD)

6.3 V

16 V

100

—

1210 case

3225 mm

C3225X5R0J107MT

C3225X5R0J476MT

C3225X5R1C226MT

C3225X5R1C106MT

≤3

≤5

(1) Total capacitance of 940 µF is acceptable based on the combined ripple current rating.

For technical support and further information, visit http://power.ti.com

Application Notes

PTH03020W & PTH05020W

Adjusting the Output Voltage of the PTH03020W &

PTH05020W Wide-Output Adjust Power Modules

Table 1-2; Output Voltage Set-Point Resistor Values

The V_oAdjust control (pin 4) sets the output voltage of

the PTH03020W and PTH05020W products. The

adjustment range of the PT03020W (3.3-V input) is

from 0.8 V to 2.5 V ¹, and the PTH05020W (5-V input)

from 0.8 V to 3.6 V. The adjustment method requires the

addition of a single external resistor, R_set, that must be

connected directly between the V_oAdjust and GND pins ².

Table 1-1 gives the preferred value of the external resistor

for a number of standard voltages, along with the actual

output voltage that this resistance value provides.

V_aReq’d

R_set

V_aReq’d

R_set

0.800

0.825

0.850

0.875

0.900

0.925

0.950

0.975

1.000

1.025

1.050

1.075

1.100

1.125

1.150

1.175

1.200

1.225

1.250

1.275

1.300

1.325

1.350

1.375

1.400

1.425

1.450

1.475

1.50

Open

2.00

2.05

2.10

2.15

2.20

2.25

2.30

2.35

2.40

2.45

2.50

2.55

2.60

2.65

2.70

2.75

2.80

2.85

2.90

2.95

3.00

3.05

3.10

3.15

3.20

3.25

3.30

3.35

3.40

3.45

3.50

3.55

3.60

4.18 kΩ

3.91 kΩ

3.66 kΩ

3.44 kΩ

3.22 kΩ

3.03 kΩ

2.84 kΩ

2.67 kΩ

2.51 kΩ

2.36 kΩ

2.22 kΩ

2.08 kΩ

1.95 kΩ

1.83 kΩ

1.72 kΩ

1.61 kΩ

1.51 kΩ

1.41 kΩ

1.32 kΩ

1.23 kΩ

1.15 kΩ

1.07 kΩ

988 Ω

318 kΩ

158 kΩ

104 kΩ

77.5 kΩ

61.5 kΩ

50.8 kΩ

43.2 kΩ

37.5 kΩ

33.1 kΩ

29.5 kΩ

26.6 kΩ

24.2 kΩ

22.1 kΩ

20.4 kΩ

18.8 kΩ

17.5 kΩ

16.3 kΩ

15.3 kΩ

14.4 kΩ

13.5 kΩ

12.7 kΩ

12.1 kΩ

11.4 kΩ

10.8 kΩ

10.3 kΩ

9.82 kΩ

9.36 kΩ

8.94 kΩ

8.18 kΩ

7.51 kΩ

6.92 kΩ

6.4 kΩ

For other output voltages the value of the required resistor

can either be calculated using the following formula, or

simply selected from the range of values given in Table 1-2.

Figure 1-1 shows the placement of the required resistor.

0.8 V

V_out– 0.8 V

R_set

= 10 kΩ ·

– 2.49 kΩ

Table 1-1; Preferred Values of R_setfor Standard Output Voltages

V_out(Standard)

R_set(Pref’d Value)

V_out(Actual)

3.3 V

2.5 V

2 V

1.8 V

1.5 V

1.2 V

1 V

698 Ω

3.309V

2.502 V

2.010 V

1.803 V

1.504 V

1.202 V

1.005 V

0.8 V

914 Ω

843 Ω

775 Ω

710 Ω

647 Ω

587 Ω

529 Ω

473 Ω

2.21 kΩ

4.12 kΩ

5.49 kΩ

8.87 kΩ

17.4 kΩ

36.5 kΩ

Open

1.55

1.60

1.65

1.70

0.8 V

419 Ω

367 Ω

1.75

1.80

1.85

1.90

5.93 kΩ

5.51 kΩ

5.13 kΩ

4.78 kΩ

4.47 kΩ

Figure 1-1; V_oAdjust Resistor Placement

V_OSense [Note 3]

1.95

V_OSense

Notes:

1. Modules that operate from a 3.3-V input bus should

not be adjusted higher than 2.5 V.

V_OUT

PTH05020W

2. Use a 0.1 W resistor. The tolerance should be 1 %, with

temperature stability of 100 ppm/°C (or better). Place

the resistor as close to the regulator as possible. Connect

the resistor directly between pins 4 and 7 using dedicated

PCB traces.

GND

V_OAdj

C_OUT

330µF

R_SET

0.1 W, 1 %

3. Never connect capacitors from V_oAdjust to either GND or

V_out. Any capacitance added to the V_oAdjust pin will affect

the stability of the regulator.

GND

For technical support and further information, visit http://power.ti.com

Application Notes

PTH Series of Wide-Output Adjust

Power Modules (3.3/5-V Input)

Features of the PTH Family of Non-Isolated

Wide Output Adjust Power Modules

output current, PTHxx020W and PTHxx030W products

incorporate over-temperature shutdown protection. All

of the products referenced in Table 3-1 include Auto-

Track™. This is a feature unique to the PTH family,

and was specifically designed to simplify the task of se-

quencing the supply voltage in a power system. These

and other features are described in the following sections.

Point-of-Load Alliance

The PTH family of non-isolated, wide-output adjust

power modules from Texas Instruments are optimized

for applications that require a flexible, high performance

module that is small in size. These products are part of

the “Point-of-Load Alliance” (POLA), which ensures

compatible footprint, interoperability and true second

sourcing for customer design flexibility. The POLA is a

collaboration between Texas Instruments, Artesyn Tech-

nologies, and Astec Power to offer customers advanced

non-isolated modules that provide the same functionality

and form factor. Product series covered by the alliance

includes the PTHxx050W (6 A), PTHxx060W (10 A),

PTHxx010W (15/12 A), PTHxx020W (22/18 A), and

the PTHxx030W (30/26 A).

Soft-Start Power Up

The Auto-Track feature allows the power-up of multiple

PTH modules to be directly controlled from the Track

pin. However in a stand-alone configuration, or when

the Auto-Track feature is not being used, the Track pin

should be directly connected to the input voltage, V_in

(see Figure 3-1).

Figure 3–1

From the basic, “Just Plug it In” functionality of the 6-A

modules, to the 30-A rated feature-rich PTHxx030W,

these products were designed to be very flexible, yet simple

to use. The features vary with each product. Table 3-1

provides a quick reference to the available features by

product and input bus voltage.

Up Dn

Track

Sense

5 V

3.3 V

V_IN

V_O

PTH05020W

Inhibit

GND

Adjust

Table 3-1; Operating Features by Series and Input Bus Voltage

C_IN

1,000 µF

C_OUT

330 µF

R_SET, 698Ω

0.1 W, 1 %

GND

Series

Input Bus

3.3 V

I _OUT

6 A

When the Track pin is connected to the input voltage the

Auto-Track function is permanently disengaged. This

allows the module to power up entirely under the control

of its internal soft-start circuitry. When power up is under

soft-start control, the output voltage rises to the set-point

at a quicker and more linear rate.

•

PTHxx050

5 V

6 A

12 V

6 A

•

3.3 V / 5 V

12 V

10 A

8 A

PTHxx060

PTHxx010

PTHxx020

PTHxx030

3.3 V / 5 V

12 V

15 A

12 A

22 A

18 A

30 A

26 A

Figure 3–2

•

3.3 V / 5 V

12 V

Vin (1 V/Div)

Vout (1 V/Div)

•

3.3 V / 5 V

12 V

For simple point-of-use applications, the PTHxx050W

provides operating features such as an on/off inhibit,

output voltage trim, pre-bias startup (3.3/5-V input only),

and over-current protection. The PTHxx060W (10 A),

and PTHxx010W (15/12 A) include an output voltage

sense, and margin up/down controls. Then the higher

Iin (5 A/Div)

HORIZ SCALE: 5 ms/Div

For technical support and further information visit http://power.ti.com

Application Notes

PTH Series of Wide-Output Adjust

Power Modules (3.3/5-V Input)

The power modules function normally when the Inhibit

pin is left open-circuit, providing a regulated output

whenever a valid source voltage is connected to V_inwith

respect to GND.

From the moment a valid input voltage is applied, the

soft-start control introduces a short time delay (typically

5 ms-10 ms) before allowing the output voltage to rise.

The output then progressively rises to the module’s set-

point voltage. Figure 3-2 shows the power-up characteristic

of the 22-A output product (PTH05020W), operating

from a 5-V input bus and configured for a 3.3-V output.

The waveforms were measured with a 5-A resistive load.

The initial rise in input current when the input voltage

first starts to rise is the charge current drawn by the input

capacitors. Power-up is complete within 15 ms.

Figure 3-3 shows the typical application of the inhibit

function. Note the discrete transistor (Q₁). The Inhibit

control has its own internal pull-up to V_inpotential. The

input is not compatible with TTL logic devices. An open-

collector (or open-drain) discrete transistor is recommended

for control.

Figure 3–3

Over-Current Protection

V_oSense

For protection against load faults, all modules incorporate

output over-current protection. Applying a load that

exceeds the regulator’s over-current threshold will cause

the regulated output to shut down. Following shutdown

a module will periodically attempt to recover by initiating

a soft-start power-up. This is described as a “hiccup” mode

of operation, whereby the module continues in a cycle of

successive shutdown and power up until the load fault is

removed. During this period, the average current flowing

into the fault is significantly reduced. Once the fault is

removed, the module automatically recovers and returns

to normal operation.

V_IN

V_OUT

PTH05020W

C_IN

1,000 µF

C_OUT

330 µF

R_SET

Q₁

BSS138

1 =Inhibit

GND

Over-Temperature Protection

The PTHxx020 and PTHxx030 series of products have

over-temperature protection. These products have an

on-board temperature sensor that protects the module’s

internal circuitry against excessively high temperatures.

A rise in the internal temperature may be the result of a

drop in airflow, or a high ambient temperature. If the

internal temperature exceeds the OTP threshold, the

module’s Inhibit control is automatically pulled low. This

turns the output off. The output voltage will drop as the

external output capacitors are discharged by the load

circuit. The recovery is automatic, and begins with a

soft-start power up. It occurs when the the sensed tem-

perature decreases by about 10 °C below the trip point.

Turning Q₁on applies a low voltage to the Inhibit control

and disables the output of the module. If Q₁is then turned

off, the module will execute a soft-start power-up. A

regulated output voltage is produced within 20 msec.

Figure 3-4 shows the typical rise in both the output volt-

age and input current, following the turn-off of Q₁. The

turn off of Q₁corresponds to the rise in the waveform,

Q₁V_ds. The waveforms were measured with a 5-A load.

Figure 3–4

Note: The over-temperature protection is a last resort mecha-

nism to prevent thermal stress to the regulator. Operation at

or close to the thermal shutdown temperature is not recom-

mended and will reduce the long-term reliability of the module.

Always operate the regulator within the specified Safe Operating

Area (SOA) limits for the worst-case conditions of ambient

temperature and airflow.

Vo (2V/Div)

Iin (2A/Div)

Q1Vds (5V/Div)

Output On/Off Inhibit

For applications requiring output voltage on/off control,

each series of the PTH family incorporates an output

Inhibit control pin. The inhibit feature can be used wher-

ever there is a requirement for the output voltage from

the regulator to be turned off.

HORIZ SCALE: 10ms/Div

For technical support and further information visit http://power.ti.com

Application Notes

PTH Series of Wide-Output Adjust

Power Modules (3.3/5-V Input)

Auto-Track™ Function

The Auto-Track function is unique to the PTH family,

and is available with the all “Point-of-Load Alliance”

(POLA) products. Auto-Track was designed to simplify

the amount of circuitry required to make the output

voltage from each module power up and power down in

sequence. The sequencing of two or more supply voltages

during power up is a common requirement for complex

mixed-signal applications, that use dual-voltage VLSI ICs

such as DSPs, micro-processors, and ASICs.

other modules, to its respective set-point voltage.

Figure 3-6 shows the output voltage waveforms from the

circuit of Figure 3-5 after the On/Off Control is set from a

high to a low-level voltage. The waveforms, Vo₁and Vo₂

represent the output voltages from the two power mod-

ules, U₁(3.3 V) and U₂(1.8 V) respectively. Vo₁and Vo₂

are shown rising together to produce the desired simul-

taneous power-up characteristic.

The same circuit also provides a power-down sequence.

Power down is the reverse of power up, and is accom-

plished by lowering the track control voltage back to zero

volts. The important constraint is that a valid input voltage

must be maintained until the power down is complete. It

also requires that Q₁be turned off relatively slowly. This

is so that the Track control voltage does not fall faster than

Auto-Track's slew rate capability, which is 1 V/ms. The

components R₁and C₁in Figure 3-5 limit the rate at

which Q₁can pull down the Track control voltage. The

values of 100 k-ohm and 0.1 µF correlate to a decay rate

of about 0.17 V/ms.

How Auto-Track Works

Auto-Track works by forcing the module’s output voltage

to follow a voltage presented at the Track control pin. This

control range is limited to between 0 V and the module’s

set-point voltage. Once the track-pin voltage is raised

above the set-point voltage, the module’s output remains

at its set-point . As an example, if the Track pin of a 2.5-V

regulator is at 1 V, the regulated output will be 1 V. But

if the voltage at the Track pin rises to 3 V, the regulated

output will not go higher than 2.5 V.

When under track control, the regulated output from

the module follows the voltage at its Track pin on a volt-

for-volt basis. By connecting the Track pin of a number

of these modules together, the output voltages will fol-

low a common signal during power-up and power-down.

The control signal can be an externally generated master

ramp waveform, or the output voltage from another power

supply circuit ³. For convenience the Track control incor-

porates an internal RC charge circuit. This operates off

the module’s input voltage to provide a suitable rising

voltage ramp waveform.

The power-down sequence is initiated with a low-to-high

transition at the On/Off Control input to the circuit.

Figure 3-7 shows the power-down waveforms. As the

Track control voltage falls below the nominal set-point

voltage of each power module, then its output voltage

decays with all the other modules under Auto-Track

control.

Notes on Use of Auto-Track™

1.The Track pin voltage must be allowed to rise above

the module’s set-point voltage before the module can

regulate at its adjusted set-point voltage.

Typical Application

The basic implementation of Auto-Track allows for

simultaneous voltage sequencing of a number of Auto-

Track compliant modules. Connecting the Track control

pins of two or more modules forces the Track control of

all modules to follow the same collective RC ramp wave-

form, and allows them to be controlled through a single

transistor or switch; Q₁in Figure 3-5.

2.The Auto-Track function will track almost any voltage

ramp during power up, and is compatible with ramp

speeds of up to 1 V/ms.

3. The absolute maximum voltage that may be applied to the

Track pin is V_in.

4.The module will not follow

a voltage at its Track control

To initiate a power-up sequence the Track control must

first pulled to ground potential. This should be done at

or before input power is applied to the modules, and then

held for at least 10 ms thereafter. This brief period gives

the modules time to complete their internal soft-start

initialization, which enables them to produce an output

voltage.

input until it has completed its soft-start initialization.

This takes about 10 ms from the time that the module

has sensed that a valid voltage has been applied its input.

During this period, it is recommended that the Track

pin be held at ground potential.

5.The module is capable of both sinking and sourcing

current when following a voltage at its Track pin.

Therefore startup into an output prebias is not supported

during Auto-Track control. Note: A pre-bias holdoff is

not necessary when all supply voltages rise simultaneously

under the control of Auto-Track.

Applying a logic-level high signal to the circuit’s On/Off

Control turns Q₁on and applies a ground signal to the

Track control. After completing their internal soft-start

intialization, the output of all modules will remain at zero

volts while Q₁is on. 10 ms after a valid input voltage has

been applied to all modules, Q₁can be turned off. This

allows the track control voltage to automatically rise

toward to the modules' input voltage. During this period

the output voltage of each module will rise in unison with

6.The Auto-Track functioncan be disabled by connecting

the Track pin to the input voltage (V_in). With Auto-Track

disabled, the output voltage will rise at a quicker and

more linear rate after input power is applied.

For technical support and further information visit http://power.ti.com

Application Notes

PTH Series of Wide-Output Adjust

Power Modules (3.3/5-V Input)

Figure 3–5; Sequenced Power Up & Power Down Using Auto-Track

Track

Vo₁=3.3 V

V_IN

V_O

+5 V

PTH05020W

Inhibit

GND

C_IN

C_OUT

R₂

698

0.1 µF

On/Off Control

Track

= Power Down

= Power Up

BSS138

Vo₂=1.8 V

100 k

V_IN

V_O

PTH05010W

Inhibit

GND

C_IN

C_OUT

R₃

0 V

5k49

Figure 3–6; Simultaneous Power Up with Auto-Track Control

Figure 3–7; Simultaneous Power Down with Auto-Track Control

Vo1 (1 V/Div)

Vo2 (1 V/Div)

On/Off Input

(5 V/Div)

On/Off Input

(5 V/Div)

HORIZ SCALE: 10 ms/Div

For technical support and further information visit http://power.ti.com

Application Notes

PTH Series of Wide-Output Adjust

Power Modules (3.3/5-V Input)

Notes:

Margin Up/Down Controls

The PTHxx060W, PTHxx010W, PTHxx020W, and

PTHxx030W products incorporate Margin Up and Margin

Down control inputs. These controls allow the output

1.The Margin Up* and Margin Dn* controls were not

intended to be activated simultaneously. If they are

their affects on the output voltage may not completely

cancel, resulting in the possibility of a slightly higher

error in the output voltage set point.

voltage to be momentarily adjusted , either up or down,

by a nominal 5 %. This provides a convenient method

for dynamically testing the operation of the load circuit

over its supply margin or range. It can also be used to verify

the function of supply voltage supervisors. The 5 %

change is applied to the adjusted output voltage, as set by

the external resistor, R_setat the V_oAdjust pin.

2.The ground reference should be

a direct connection to

the module GND at pin 7 (pin 1 for the PTHxx050).

This will produce a more accurate adjustment at the

load circuit terminals. The transistors Q₁and Q₂should

be located close to the regulator.

The 5 % adjustment is made by pulling the appropriate

margin control input directly to the GND terminal .

3.The Margin Up and Margin Dn control inputs are not

compatible with devices that source voltage. This includes

TTL logic. These are analog inputs and should only be

controlled with a true open-drain device (preferably

a discrete MOSFET transistor). The device selected

should have low off-state leakage current. Each input

sources 8 µA when grounded, and has an open-circuit

voltage of 0.8 V.

A low-leakage open-drain device, such as an n-channel

MOSFET or p-channel JFET is recommended for this

purpose . Adjustments of less than 5 % can also be accom-

modated by adding series resistors to the control inputs.

The value of the resistor can be selected from Table 3-2,

or calculated using the following formula.

Up/Down Adjust Resistance Calculation

To reduce the margin adjustment to something less than

5 %, series resistors are required (See R_Dand R_Uin

Figure 3-8). For the same amount of adjustment, the

resistor value calculated for R_Uand R_Dwill be the same.

The formulas is as follows.

Table 3-2; Margin Up/Down Resistor Values

% Adjust

R_U/ R_D

0.0 kΩ

24.9 kΩ

66.5 kΩ

150.0 kΩ

397.0 kΩ

499

∆%

R_Uor R_D=

– 99.8

kΩ

Where ∆% = The desired amount of margin adjust in

percent.

Figure 3–8; Margin Up/Down Application Schematic

+V_o

PTH05010W

(Top View)

V_IN

+V_OUT

R_D

R_U

R_SET

0.1 W, 1 %

C_in

MargDn

MargUp

C_out

Q₁

Q₂

GND

For technical support and further information visit http://power.ti.com

Application Notes

PTH Series of Wide-Output Adjust

Power Modules (3.3/5-V Input)

Notes

Pre-Bias Startup Capability

Only selected products in the PTH family incorporate this

capability. Consult Table 3-1 to identify which products

are compliant.

1.Startup includes the short delay (approx. 10 ms) prior

to the output voltage rising, followed by the rise of the

output voltage under the module’s internal soft-start

control. Startup is complete when the output voltage

has risen to either the set-point voltage or the voltage

at the Track pin, whichever is lowest.

A pre-bias startup condition occurs as a result of an external

voltage being present at the output of a power module prior

to its output becoming active. This often occurs in com-

plex digital systems when current from another power

source is backfed through a dual-supply logic component,

such as an FPGA or ASIC. Another path might be via

clamp diodes as part of a dual-supply power-up sequencing

arrangement. A prebias can cause problems with power

modules that incorporate synchronous rectifiers. This is

because under most operating conditions, these types of

modules can sink as well as source output current.

2.To ensure that the regulator does not sink current when

power is first applied (even with a ground signal applied

to the Inhibit control pin), the input voltage must always

be greater than the output voltage throughout the

power-up and power-down sequence.

3.The Auto-Track function can be disabled at power up

by immediately applying a voltage to the module’s Track

pin that is greater than its set-point voltage. This can

be easily accomplished by connecting the Track pin to

V_in.

The PTH family of power modules incorporate synchro-

nous rectifiers, but will not sink current during startup ,

or whenever the Inhibit pin is held low. However, to ensure

satisfactory operation of this function, certain conditions

must be maintained. Figure 3-9 shows an application

Figure 3–10; Pre-Bias Startup Waveforms

demonstrating the pre-bias startup capability. The start-

up waveforms are shown in Figure 3-10. Note that the

output current from the PTH03010W (I_o) shows negli-

gible current until its output voltage rises above that

backfed through diodes D₁and D₂.

Vin (1 V/Div)

Vo (1 V/Div)

Note: The pre-bias start-up feature is not compatible with

Auto-Track. When the module is under Auto-Track control,

it will sink current if the output voltage is below that of a

back-feeding source. To ensure a pre-bias hold-off one of two

approaches must be followed when input power is applied to

Io (5 A/Div)

the module. The Auto-Track function must either be disabled ,

or the module’s output held off (for at least 50 ms) using the

Inhibit pin. Either approach ensures that the Track pin volt-

age is above the set-point voltage at start up.

HORIZ SCALE: 5 ms/Div

Figure 3–9; Application Circuit Demonstrating Pre-Bias Startup

V_IN= 3.3 V

Track

Sense

V_o= 2.5 V

V_IN

Inhibit

V_O

P T H 0 3 0 1 0 W

GND

Vadj

I_o

VCCIO

VCORE

R₂

2k21

C_IN

C_OUT

330 µF

ASIC

For technical support and further information visit http://power.ti.com

Application Notes

PTH Series of Wide-Output Adjust

Power Modules (3.3/5-V Input)

Remote Sense

The PTHxx060W, PTHxx010W, PTHxx020W, and

PTHxx030W products incorporate an output voltage

sense pin, V_oSense. The V_oSense pin should be connected

to V_outat the load circuit (see data sheet standard appli-

cation). A remote sense improves the load regulation

performance of the module by allowing it to compensate

for any ‘IR’ voltage drop between itself and the load. An

IR drop is caused by the high output current flowing

through the small amount of pin and trace resistance.

Use of the remote sense is optional. If not used, the

V_oSense pin can be left open-circuit. An internal low-

value resistor (15-Ω or less) is connected between the

V_oSense and V_out. This ensures the output voltage remains

in regulation.

With the sense pin connected, the difference between

the voltage measured directly between the V_outand GND

pins, and that measured from V_oSense to GND, is the

amount of IR drop being compensated by the regulator.

This should be limited to a maximum of 0.3 V.

Note: The remote sense feature is not designed to compensate

for the forward drop of non-linear or frequency dependent

components that may be placed in series with the converter

output. Examples include OR-ing diodes, filter inductors,

ferrite beads, and fuses. When these components are enclosed

by the remote sense connection they are effectively placed

inside the regulation control loop, which can adversely affect

the stability of the regulator.

For technical support and further information visit http://power.ti.com

PACKAGE OPTION ADDENDUM

www.ti.com

13-Nov-2010

PACKAGING INFORMATION

Status ⁽¹⁾

Eco Plan ⁽²⁾

Pb-Free (RoHS)

TBD

MSL Peak Temp ⁽³⁾

Samples

Orderable Device

Package Type Package

Drawing

Pins

Package Qty

Lead/

Ball Finish

(Requires Login)

PTH03020WAH

PTH03020WAS

PTH03020WAST

PTH03020WAZ

PTH03020WAZT

ACTIVE

Through-

EUK

EUL

N / A for Pkg Type

Request Free Samples

Hole Module

Surface

SNPB

Level-1-235C-UNLIM/

Level-3-260C-168HRS

Request Free Samples

Purchase Samples

Mount Module

Surface

200

TBD

Level-1-235C-UNLIM/

Level-3-260C-168HRS

Mount Module

Surface

Pb-Free (RoHS)

SNAGCU Level-3-260C-168 HR

Request Free Samples

Purchase Samples

Mount Module

Surface

200

SNAGCU Level-3-260C-168 HR

Mount Module

⁽¹⁾The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

⁽²⁾Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability

information and additional product content details.

TBD: The Pb-Free/Green conversion plan has not been defined.

Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that

lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.

Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between

the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.

Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight

in homogeneous material)

⁽³⁾MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information

provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and

continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.

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In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.

Addendum-Page 1

PACKAGE OPTION ADDENDUM

www.ti.com

13-Nov-2010

Addendum-Page 2

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responsible or liable for any such statements.

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Following are URLs where you can obtain information on other Texas Instruments products and application solutions:

Products

Applications

Audio

Amplifiers

amplifier.ti.com

dataconverter.ti.com

www.dlp.com

www.ti.com/audio

Data Converters

DLP® Products

Automotive

www.ti.com/automotive

www.ti.com/communications

Communications and

Telecom

DSP

dsp.ti.com

Computers and

Peripherals

www.ti.com/computers

Clocks and Timers

Interface

www.ti.com/clocks

interface.ti.com

logic.ti.com

Consumer Electronics

Energy

www.ti.com/consumer-apps

www.ti.com/energy

Logic

Industrial

www.ti.com/industrial

Power Mgmt

Microcontrollers

RFID

power.ti.com

Medical

www.ti.com/medical

microcontroller.ti.com

www.ti-rfid.com

Security

www.ti.com/security

Space, Avionics &

Defense

www.ti.com/space-avionics-defense

RF/IF and ZigBee® Solutions www.ti.com/lprf

Video and Imaging

Wireless

www.ti.com/video

www.ti.com/wireless-apps

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