SS

EN

VREG5

VFB

1

2

3

4

VBST

VIN

SW

GND

8

7

6

5

VOUT

PwPd

TPS54239EDDA

9

VOUT

VIN

EN

Vout (50 mV/div)

Iout (1 A/div)

100 us/div

TPS54239E

www.ti.com

SLVSBT1 – JANUARY 2013

4.5V to 23V Input, 2-A Synchronous Step-Down SWIFT™ Converter With Eco-mode™

Check for Samples: TPS54239E

1

FEATURES

DESCRIPTION

The TPS54239E is an adaptive on-time D-CAP2™

23

•

D-CAP2™ Mode Enables Fast Transient

mode synchronous buck converter. The TPS54239E

Response

enables system designers to complete the suite of

•

Low Output Ripple and Allows Ceramic Output

various end-equipment power bus regulators with a

Capacitor

cost effective, low component count, low standby

current solution. The main control loop for the

•

TPS54239E uses the D-CAP2™ mode control that

•

Output Voltage Range: 0.76 V to 7.0 V

provides a fast transient response with no external

•

Highly Efficient Integrated FETs Optimized

compensation components. The adaptive on-time

for Lower Duty Cycle Applications

control supports seamless transition between PWM

– 140 m

Ω (High Side) and 70 mΩ (Low Side)

mode at higher load conditions and Eco-mode™

operation at light loads. Eco-mode™ allows the

•

High Efficiency, less than 10

μA at shutdown

TPS54239 to maintain high efficiency during lighter

•

High Initial Bandgap Reference Accuracy

load

conditions.

The

TPS54239E

also

has

a

•

Adjustable Soft Start

proprietary circuit that enables the device to adopt to

both low equivalent series resistance (ESR) output

•

Pre-Biased Soft Start

capacitors, such as POSCAP or SP-CAP, and ultra-

•

low ESR ceramic capacitors. The device operates

•

Cycle By Cycle Over Current Limit

from 4.5-V to 23-V VIN input. The output voltage can

be programmed between 0.76 V and 7 V. The device

•

Auto-Skip Eco-mode™ for High Efficiency at

also features an adjustable soft start time. The

Light Load

TPS54239E is available in the 8-pin DDA package,

and 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 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.