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FEATURES

APPLICATIONS

DESCRIPTION

SWN

TPS65123

D1

L1

10

C1

2.2

V

IN

2.7 V to 5.5 V

V

GL

down to −18 V/2 mA

C3

100 nF

R4

R3

SWP

FBL

VMAIN

FBM

C5

220 nF

R6

R5

V

MAIN

3.0 V to 5.3 V/25 mA

C4

1

BOOT

VGH

C2

100 nF

V

GH

up to 20 V/2 mA

PGND

AGND

FBH

RUN

EN

VIN

A

A

GATE

R2

R1

F

µ

µ

F

µ

H

0

10

20

30

40

50

60

70

80

90

100

TPS65120, TPS65121, TPS65123, TPS65124

SLVS531A – JUNE 2004 – REVISED MARCH 2005

SINGLE-INDUCTOR QUADRUPLE-OUTPUT

TFT LCD POWER SUPPLY

•

Automatic or Programmable Power

Sequencing

•

•

Complete 1 mm Component Profile Solution

– Adjustable Voltage, 3.0 V to 5.6 V/25 mA

•

2.5 V to 5.5 V Input Voltage Range

•

Output Short Circuit Protected

– ±0.8% Typical Accuracy

– Efficiency up to 83%

•

16-Pin QFN Package (3 × 3 × 0,9 mm)

•

– Adjustable Voltage up to 20 V/2 mA

•

Small Form Factor a-Si and LTPS TFT LCD

– ±3% Typical Accuracy

•

Cell Phones, Smart Phones

•

•

PDAs, Pocket PCs

– Adjustable Voltage down to -18 V/2 mA

•

Portable DVD

– ±3% Typical Accuracy

•

Digital-Still Cameras, Camcorders

•

Auxiliary 1.8 V/3.3 V Linear Regulator

•

Handheld Instruments

•

Portable GPS

•

Car Navigation Systems

The TPS6512x DC-DC converter supplies all three voltages required by amorphous-silicon (a-Si) and

low-temperature poly-silicon (LTPS) TFT-LCD displays. The compact layout of the TPS6512x uses a single

inductor to generate independently-regulated positive and negative outputs. A free-running variable peak current

PWM control scheme time-multiplexes the inductor between outputs. This control architecture operates at a

pseudo-fixed-frequency to provide fast response to line and load transients while maintaining a relatively

constant switching frequency and high efficiency over a wide range of input and output voltages. Due to the high

switching frequency capability of the device, inexpensive and ultra-thin 8.2 or 10 µH inductors can be used.

-18 V for the LCD gate drive. The device has internal current limiting for high reliability under fault conditions.

Additionally, the device offers a fixed output linear regulator for the LCD logic circuitry.

Figure 1. Typical Application

Figure 2. Core Converter Efficiency

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 © 2004–2005, 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.