Vout( 50mV/div)

Iout( 2A/div)

100us/div

TPS56428

TPS56428

www.ti.com

SLVSBV4A – APRIL 2013 – REVISED APRIL 2013

4.5V to 18 V Input, 4-A Synchronous Step-Down Converter with Advanced Eco-mode™

Check for Samples: TPS56428

1

FEATURES

DESCRIPTION

The TPS56428 is an adaptive on-time D-CAP2™

23

•

D-CAP2™ Mode Enables Fast Transient

mode synchronous buck converter.

Response

The

TPS56428

enables

system

designers

to

•

Low Output Ripple and Allows Ceramic Output

complete the suite of various end-equipment power

Capacitor

bus regulators with a cost effective, low component

•

count, low standby current solution.

•

Output Voltage Range: 0.6 V to 7.0 V

The main control loop for the TPS56428 uses the D-

•

Highly Efficient Integrated FETs Optimized

CAP2™ mode control that provides a fast transient

for Lower Duty Cycle Applications

response

with

no

external

compensation

– 68 m

Ω (High Side) and 37 mΩ (Low Side)

components.

•

High Efficiency, Less Than 10

μA at Shutdown

The adaptive on-time control supports seamless

•

High Initial Bandgap Reference Accuracy

transition

between

PWM

mode

at

higher

load

conditions and advanced Eco-mode™ operation at

•

Pre-Biased Soft Start

light loads.

•

Advanced Eco-mode™ allows the TPS56428 to

•

Cycle By Cycle Over Current Limit

maintain high efficiency during lighter load conditions.

•

Advanced Auto-Skip Eco-mode™ for High

The TPS56428 also has a proprietary circuit that

Efficiency at Light Load

enables the device to adopt to both low equivalent

•

Power Good output

series resistance (ESR) output capacitors, such as

•

Fixed Soft Start : 1.0ms

POSCAP or SP-CAP, and ultra-low ESR ceramic

capacitors. The device operates from 4.5-V to 18 V

APPLICATIONS

VIN input.

•

Wide Range of Applications for Low Voltage

The output voltage can be programmed between

System

0.6V and 7.0V.

–

Digital TV Power Supply

The device also features a fixed 1 msec soft start

–

High Definition Blu-ray Disc™ Players

time.

–

Networking Home Terminal

The TPS56428 is available in 8-pin DDA package

and is designed to operate over the ambient

–

Digital Set Top Box (STB)

temperature range of –40°C to 85°C.

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

D-CAP2, Eco-mode are trademarks of Texas Instruments.

3

Blu-ray Disc is a trademark of Blu-ray Disc Association.

PRODUCTION DATA information is current as of publication date.

Copyright © 2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.