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

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Design

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.

TPS5430, TPS5431

SLVS632I – JANUARY 2006 – REVISED APRIL 2017

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

1

1 Features

1

•

Wide Input Voltage Range:

–

TPS5430: 5.5 V to 36 V

–

TPS5431: 5.5 V to 23 V

•

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

•

High Efficiency up to 95% Enabled by 110-m

Ω

Integrated MOSFET Switch

•

Wide Output Voltage Range: Adjustable Down to

1.22 V with 1.5% Initial Accuracy

•

Internal Compensation Minimizes External Parts

Count

•

Fixed 500 kHz Switching Frequency for Small

Filter Size

•

Improved Line Regulation and Transient

Response by Input Voltage Feed Forward

•

System Protected by Overcurrent Limiting,

Overvoltage Protection and Thermal Shutdown

•

–40°C to 125°C Operating Junction Temperature

Range

•

Available in Small Thermally Enhanced 8-Pin SO

PowerPAD™ Package

•

Create a Custom Design Using the TPS5430 With

the WEBENCH® Power Designer

2 Applications

•

Consumer: Set-top Box, DVD, LCD Displays

•

Industrial and Car Audio Power Supplies

•

Battery Chargers, High Power LED Supply

•

12-V/24-V Distributed Power Systems

3 Description

The TPS543x is a high-output-current PWM converter

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

MOSFET. Included on the substrate with the listed

features

are

a

high-performance

voltage

error

amplifier

that

provides

tight

voltage

regulation

accuracy under transient conditions; an undervoltage-

lockout circuit to prevent start-up until the input

voltage reaches 5.5 V; an internally set slow-start

circuit to limit inrush currents; and a voltage feed-

forward circuit to improve the transient response.

Using the ENA pin, shutdown supply current is

reduced to 18 μA typically. Other features include an

active-high enable, overcurrent limiting, over-voltage

protection and thermal shutdown. To reduce design

complexity

and

external

component

count,

the

TPS543x feedback loop is internally compensated.

The TPS5431 is intended to operate from power rails

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

power sources including 24 V bus.

The TPS543x device is available in a thermally

enhanced, easy to use 8-pin SOIC PowerPAD™

package. TI provides evaluation modules and the

Designer software tool to aid in quickly achieving

high-performance power supply designs to meet

aggressive equipment development cycles.

PART NUMBER

PACKAGE

INPUT VOLTAGE

TPS5430

HSOP (8)

5.5 V to 36 V

TPS5431

5.5 V to 23 V

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

the end of the datasheet.