VIN

NC

NC

ENA

GND

VSENSE

BOOT

PH

TPS5430/31

VIN

VOUT

95

60

70

80

90

100

0

0.5

1

1.5

2.5

3

3.5

I

OutputCurrent

A

O

-

-

EfficiencyvsOutputCurrent

SimplifiedSchematic

V

V =5V

f =500kHz

T =25 C

O

s

A

o

2

50

55

65

75

85

Product

Folder

Sample &

Buy

Technical

Documents

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Software

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Reference

Design

TPS5430, TPS5431

SLVS632G – JANUARY 2006 – REVISED FEBRUARY 2015

TPS543x 3-A, Wide Input Range, Step-Down Converter

1 Features

3 Description

The TPS543x is a high-output-current PWM converter

1

•

Wide Input Voltage Range:

that integrates a low-resistance, high-side N-channel

–

TPS5430: 5.5 V to 36 V

MOSFET. Included on the substrate with the listed

–

TPS5431: 5.5 V to 23 V

features

are

a

high-performance

voltage

error

amplifier

that

provides

tight

voltage

regulation

•

Up to 3-A Continuous (4-A Peak) Output Current

accuracy under transient conditions; an undervoltage-

•

High Efficiency up to 95% Enabled by 110-m

Ω

lockout circuit to prevent start-up until the input

Integrated MOSFET Switch

voltage reaches 5.5 V; an internally set slow-start

•

Wide Output Voltage Range: Adjustable Down to

circuit to limit inrush currents; and a voltage feed-

1.22 V with 1.5% Initial Accuracy

forward circuit to improve the transient response.

Using the ENA pin, shutdown supply current is

•

Internal Compensation Minimizes External Parts

reduced to 18

μA typically. Other features include an

Count

active-high enable, overcurrent limiting, over-voltage

•

Fixed 500 kHz Switching Frequency for Small

protection and thermal shutdown. To reduce design

Filter Size

complexity

and

external

component

count,

the

•

Improved Line Regulation and Transient

TPS543x feedback loop is internally compensated.

The TPS5431 is intended to operate from power rails

Response by Input Voltage Feed Forward

up to 23 V. The TPS5430 regulates a wide variety of

•

System Protected by Overcurrent Limiting,

power sources including 24 V bus.

Overvoltage Protection and Thermal Shutdown

The TPS543x device is available in a thermally

•

–40°C to 125°C Operating Junction Temperature

enhanced, easy to use 8-pin SOIC PowerPAD™

Range

package. TI provides evaluation modules and the

•

Available in Small Thermally Enhanced 8-Pin SO

Designer software tool to aid in quickly achieving

PowerPAD™ Package

high-performance power supply designs to meet

aggressive equipment development cycles.

2 Applications

Device Information(1)

•

Consumer: Set-top Box, DVD, LCD Displays

PART NUMBER

PACKAGE

INPUT VOLTAGE

•

Industrial and Car Audio Power Supplies

TPS5430

5.5 V to 36 V

•

Battery Chargers, High Power LED Supply

HSOP (8)

TPS5431

5.5 V to 23 V

•

12-V/24-V Distributed Power Systems

(1) For all available packages, see the orderable addendum at

the end of the datasheet.

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.