V

(50mV/div)

OUT

I

(1 A/div)

OUT

100

s/div

m

TPS54326

www.ti.com

SLVSA13E – OCTOBER 2009 – REVISED JUNE 2012

4.5V to 18V Input, 3-A Synchronous Step-Down Converter with Eco-mode™

Check for Samples: TPS54326

1

FEATURES

DESCRIPTION

The TPS54326 is an adaptive on-time D-CAP2™

23

•

D-CAP2™ Mode Enables Fast Transient

mode synchronous buck converter. The TPS54326

Response

enables system designers to complete the suite of

•

Low Output Ripple and Allows Ceramic Output

various end equipment’s power bus regulators with a

Capacitor

cost effective, low component count, low standby

current solution. The main control loop for the

•

TPS54326 uses the D-CAP2™ mode control which

•

provides a fast transient response with no external

•

Output Voltage Range: 0.76 V to 5.5 V

components. The adoptive on-time control supports

•

Highly Efficient Integrated FET’s Optimized

seamless operation between PWM mode at heavy

load condition and reduced frequency Eco-mode™

for Lower Duty Cycle Applications

operation at light load for high efficiency.

- 120 m

Ω (High Side) and 70 mΩ (Low Side)

•

High Efficiency, less than 10

μA at Shutdown

The TPS54326 also has a proprietary circuit that

enables the device to adapt 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

•

High Initial Bandgap Reference Accuracy

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

•

Adjustable Soft Start

supply

voltage.

The

output

voltage

can

be

•

Pre-Biased Soft Start

programmed between 0.76 V and 5.5 V. The device

•

also features an adjustable slow start time and a

•

Cycle-By-Cycle Overcurrent Limit

power good function. The TPS54326 is available in

the 14 pin HTSSOP or 16 pin QFN package, and

•

Power Good Output

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

APPLICATIONS

•

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 © 2009–2012, 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.