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FEATURES

DESCRIPTION

APPLICATIONS

Vin

V 1

U

o

p to 15 V / 400 mA

V 3

U

o

p to 30 V / 20 mA

V 2

U

o

p to 12 V / 20 mA

V 4

3.3

o

V

Vcom

Boost

Converter

Positive Charge

Pump

Negative

Charge Pump

Vcom Buffer

Linear Regulator

Controller

TPS6514x

2.7 V to 5.8 V

TPS65140, TPS65141

TPS65145

SLVS497C – SEPTEMBER 2003 – REVISED APRIL 2006

TRIPLE OUTPUT LCD SUPPLY WITH LINEAR REGULATOR AND POWER GOOD

•

2.7-V to 5.8-V Input Voltage Range

The TPS6514x series offers a compact and small

power supply solution to provide all three voltages

•

1.6-MHz Fixed Switching Frequency

required by thin film transistor (TFT) LCD displays.

•

3 Independent Adjustable Outputs

The auxiliary linear regulator controller can be used

•

Main Output up to 15 V With <1% Typical

to generate a 3.3-V logic power rail for systems

Output Voltage Accuracy

powered by a 5-V supply rail only.

•

Virtual Synchronous Converter Technology

•

PWM boost converter providing the source drive

voltage for the LCD display. The device is available

•

in two versions with different internal switch current

•

Auxiliary 3.3-V Linear Regulator Controller

limits to allow the use of a smaller external inductor

•

Internal Soft Start

when

lower

output

power

is

required.

The

TPS65140/41 has a typical switch current limit of 2.3

•

Internal Power-On Sequencing

A and the TPS65145 has a typical switch current

•

Fault Detection of all Outputs (TPS65140/45)

limit of 1.37 A. A fully integrated adjustable charge

•

No Fault Detection (TPS65141)

pump doubler/tripler provides the positive LCD gate

drive voltage. An externally adjustable negative

•

Thermal Shutdown

charge pump provides the negative gate drive

•

System Power Good

voltage.

Due

to

the

high

1.6-MHz

switching

•

Available in TSSOP-24 and QFN-24

frequency of the charge pumps, inexpensive and

PowerPAD™ Packages

small 220-nF capacitors can be used.

Additionally, the TPS6514x series has a system

power good output to indicate when all supply rails

•

TFT LCD Displays for Notebooks

are acceptable. For LCD panels powered by 5 V the

•

TFT LCD Displays for Monitors

device has a linear regulator controller using an

external transistor to provide a regulated 3.3 V

•

Portable DVD Players

output for the digital circuits. For maximum safety,

•

Tablet PCs

the TPS65140/45 goes into shutdown as soon as

•

Car Navigation Systems

one of the outputs is out of regulation. The device

•

Industrial Displays

can be enabled again by toggling the input or the

enable (EN) pin to GND. The TPS65141 does not

enter shutdown when one of its outputs is below its

power good threshold.

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.

PowerPAD is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2003–2006, 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.