Vout (50 mV/div)

Iout (2 A/div)

100

s/div

m

TPS54426

www.ti.com

SLVSAD6 – AUGUST 2010

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

Check for Samples: TPS54426

1

FEATURES

DESCRIPTION

23

•

D-CAP2™ Mode Enables Fast Transient

Response

The TPS54426 is an adaptive on-time D-CAP2™

mode synchronous buck converter. The TPS54426

•

Low Output Ripple and Allows Ceramic Output

enables system designers to complete the suite of

Capacitor

various end equipment’s power bus regulators with a

•

cost effective, low component count, low standby

•

Output Voltage Range: 0.76 V to 5.5 V

current solution. The main control loop for the

TPS54426 uses the D-CAP2™ mode control which

•

Highly Efficient Integrated FET’s Optimized

provides a very fast transient response with no

for Lower Duty Cycle Applications

external compensation components. The adaptive

– 65 m

Ω (High Side) and 55 mΩ (Low Side)

on-time control supports seamless transition between

•

High Efficiency, less than 10 mA at shutdown

PWM

mode

at

higher

load

conditions

and

•

High Initial Bandgap Reference Accuracy

Eco-mode™ operation at light loads. Eco-mode™

allows the TPS54426 to maintain high efficiency

•

Adjustable Soft Start

during lighter load conditions. The TPS54426 also

•

Pre-Biased Soft Start

has a proprietary circuit that enables the device to

•

adopt to both low equivalent series resistance (ESR)

output capacitors, such as POSCAP, SP-CAP, and

•

Cycle By Cycle Over Current Limit

ultra-low

ESR

ceramic

capacitors.

The

device

•

Power Good Output

operates from 4.5-V to 18-V VIN input. The output

•

Auto-Skip Eco-mode™ for High Efficiency at

voltage can be programmed between 0.76 V and 5.5

Light Load

V. The device also features an adjustable soft start

time and a power good function. The TPS54426 is

available in the 14-pin HTSSOP package, and

APPLICATIONS

designed to operate from –40°C to 85°C.

•

Wide Range of Applications for Low Voltage

System

–

Digital TV Power Supply

–

High Definition Blu-ray Disc™ Players

–

Networking Home Terminal

–

Digital Set Top Box (STB)

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, PowerPAD 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 © 2010, 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.