IsolationSwitch

Control

Boost

Converter

Buck

Converter

Positive

LDOController

Negative

LDOController

Reset

Generator

TPS65170

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SLVSA27 – OCTOBER 2009

LCD Bias Supply

Check for Samples :TPS65170

The TPS65170 also provides a reset circuit that

1

FEATURES

•

8.6V to 14.7V Input Voltage Range

generates a reset signal for the timing controller

•

2.8A Boost Converter Switch Current Limit

during power-up.

•

Boost Converter Output Voltages up to 18.5V

A control signal can also be generated to control an

•

Boost and Buck Converter Short-Circuit

external MOSFET isolation switch located between

Protection

the output of the boost converter and the display

panel.

•

1.5A Buck Converter Switch Current Limit

•

Fixed 750kHz Switching Frequency for Buck

and Boost Converters

•

Fixed Buck Converter Soft-Start

•

Programmable Boost Converter Soft-Start

•

•

Control Signal for External High-Side MOSFET

Isolation Switch

•

Reset Signal With Programmable Reset Pulse

Duration

•

Thermal Shutdown

•

28-Pin 5×5 mm QFN Package

APPLICATIONS

•

LCD TVs and Monitors

DESCRIPTION

The TPS65170 provides a simple and economic

power supply solution for a wide variety of LCD bias

applications.

In typical display panel applications, the boost

converter

generates

the

display

panel’s

source

voltage

pump controllers regulate the external charge pumps

generating the display transistors’ on and off supplies

By using external transistors to regulate the charge

pump output voltage, power dissipation in the IC is

significantly reduced, simplifying PCB thermal design

and improving reliability.

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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 © 2009, 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.