TPS65253

www.ti.com

SLVSAW8

– JUNE 2011

4.5-V TO 16-V INPUT, HIGH CURRENT, SYNCHRONOUS STEP DOWN DUAL BUCK

CONVERTER WITH INTEGRATED FETS

Check for Samples: TPS65253

•

Current-Mode Control With Simple

1

FEATURES

Compensation Circuit

•

Wide Input Supply Voltage Range:

•

Power Good and Reset Generator

4.5 V - 16 V

•

Low Power Mode Set By External Signal

•

•

Supervisory Circuit

•

Fully Integrated Dual Buck, 3.5-A/2.5-A

•

QFN Package, 28-Pin 5 mm x 5 mm RHD

Continuous Current (4-A/3-A Maximum

Current)

APPLICATIONS

•

High Efficiency

•

300-kHz - 1.2-MHz Switching Frequency Set by

•

DTV

External Resistor

•

DSL Modems

•

External Eenable/Sequencing Pins

•

Cable Modems

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Adjustable Cycle-by-Cycle Current Limit Set

•

Set Top Boxes

by External Resistor

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Car DVD Players

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Soft-Start Pins

•

Home Gateway and Access Point Networks

•

Wireless Routers

DESCRIPTION/ORDERING INFORMATION

The TPS65253 features two synchronous wide input range high efficiency buck converters. The converters are

designed to simplify product application while giving designers the options to optimize their usage according to

the target application.

The converters can operate in 5-, 9- and 12-V systems and have integrated power transistors. The output voltage

can be set externally using a resistor divider to any value between 0.8 V and the input supply minus 1 V. Each

converter features an enable pin that allows a delayed start-up for sequencing purposes, soft-start pin that allows

adjustable soft-start time by choosing the soft-start capacitor, and a current limit (RLIMx) pin that enables

designer to adjust current limit by selecting an external resistor and optimize the choice of inductor. The CMP pin

allows optimizing transient versus dc accuracy response with a simple RC compensation.

regulators are designed to operate from 300 kHz to 1.2 MHz. The converters operate with 180

° phase between

then to minimize the input filter requirements.

TPS65253 also features a low power mode enabled by an external signal, which allows for a reduction on the

input power supplied to the system when the host processor is in stand-by (low activity) mode.

TPS65253 features a supervisor circuit that monitors both converters and provides a PGOOD signal (End of

Reset) with a 32-ms timer.

TPS65253 is packaged in a small, thermally efficient 28-pin QFN package.

PART NUMBER

TOP-SIDE MARKING

-40

°C to 85°C

28-Pin (QFN) - RHD

TPS65253RHD

TPS65253

(1)

For the most current packaging and ordering information, see the Package Option Addendum at the end of this document, or see the TI

web site at www.ti.com.

(2)

Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.

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.

PRODUCTION DATA information is current as of publication date.

Copyright

© 2011, 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.