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LT1947

Adjustable Output TFT-LCD

Triple Switching Regulator

FEATURES

s

s

s

s

s

s

s

s

s

s

s

DESCRIPTIO

Complete Solution Under 1.2mm

Develops Three Outputs from a 3.3V or 5V Supply

Externally Programmable V

ON

Delay

Fixed Frequency Low Noise Outputs

All Ceramic Capacitors

3MHz Switching Frequency

Fast Transient Response

Few External Components Required

2.7V to 8V Input Range

Adjustable AV

DD

and V

ON

Voltages

Tiny 10-Lead MSOP Package

APPLICATIO S

s

s

s

s

TFT-LCD Notebook Display Panels

TFT-LCD Desktop Monitor Display Panels

Digital Cameras

Handheld Computers

The LT

廬

1947 is a highly integrated multiple output DC/DC

converter designed for use in TFT-LCD panels. The device

contains two independent switching regulators. The main

regulator has an adjustable output voltage with an internal

1.1A switch that can generate a boosted voltage as high as

30V. The second regulator鈥檚 output is also adjustable up

to 30V and can deliver 10mA for positive bias. A simple

level-shift charge pump off the main switch node gener-

ates the negative bias voltage. An external capacitor sets

the delay time from AV

DD

鈥檚 final value to the rising edge at

the V

ON

pin. The 3MHz switching frequency allows the use

of tiny low profile chip inductors and capacitors through-

out, providing a low noise, low cost total solution with all

components under 1.2mm in height. The device operates

from an input range of 2.7V to 8V and is available in a

10-lead MSOP package.

, LTC and LT are registered trademarks of Linear Technology Corporation.

TYPICAL APPLICATIO

D3

D4

L1

3.3碌H

V

IN

L2

4.7碌H

C1

2.2碌F

CERAMIC

C6

0.68碌F

D1

V

IN

SW2

SW1

FB1

C4

0.68碌F

CERAMIC

AV

DD

8V

200mA

R1

53.6k

C2

3.3碌F

CERAMIC

脳2

V

SHDN

5V/DIV

V

ON

20V/DIV

V

OFF

鈥?V

10mA

D2

V

O2

C3

220nF

R3

182k

FB2

R4

10k

SHDN C

T

C5

10nF

D1: MBRM120LT3

D2: CMDSH-3

D3, D4: BAT54S DUAL DIODE

L1: SUMIDA CLQ4D103R3

L2: TAIYO YUDEN LB2012B4R7M

V

ON

GND

LT1947

R2

10k

V

ON

24V

10mA

AV

DD

10V/DIV

SHUTDOWN

V

OFF

10V/DIV

1947 F01

C1: TAIYO YUDEN LMK316BJ225MD

C2: TAIYO YUDEN LMK325BJ335MD

脳2

C3: AVX 0.22碌F 25V X7R

C4, C6: TAIYO YUDEN LMK107BJ684MA

Figure 1. 3.3V Powered TFT-LCD Bias Generator

1947f

U

Start-Up Waveforms

2ms/DIV

1947 TA01.tif

U

U

1

next

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