TPS54428DDA

Vout(50mV/div)

Iout(2A/div)

100us/div

.

TPS54428

www.ti.com

SLVSB42A

– NOVEMBER 2011 – REVISED JANUARY 2012

4.5V to 18 V Input, 4-A Synchronous Step-Down SWIFT

™ Converter with Eco-Mode™

Check for Samples: TPS54428

1

FEATURES

DESCRIPTION

The TPS54428 is an adaptive on-time D-CAP2

™

23

•

D-CAP2

™ Mode Enables Fast Transient

mode synchronous buck converter.

Response

The

TPS54428

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: 0.76 V to 7.0 V

The main control loop for the TPS54428 uses the

•

Highly Efficient Integrated FETs Optimized

D-CAP2

™ mode control that provides a fast transient

for Lower Duty Cycle Applications

response

with

no

external

compensation

– 70 mΩ (High Side) and 53 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 Eco-mode

™ operation at light loads.

•

Adjustable Soft Start

•

Pre-Biased Soft Start

Eco-mode

™ allows the TPS54428 to maintain high

efficiency during lighter load conditions.

•

•

Cycle By Cycle Over Current Limit

The TPS54428 also has a proprietary circuit that

enables the device to adopt to both low equivalent

•

Auto-Skip Eco-mode

™ for High Efficiency at

series resistance (ESR) output capacitors, such as

Light Load

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

0.76 V and 7.0 V.

– Digital TV Power Supply

The device also features an adjustable soft start time.

– High Definition Blu-ray Disc™ Players

The TPS54428 is available in the 8-pin DDA

– Networking Home Terminal

package,and designed to operate from

–40°C to

– Digital Set Top Box (STB)

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 is a trademark 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

© 2011–2012, 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.