Datasheet > LT1947_1

LT1947_1

更新时间： 2024-10-03 05:43:27

品牌	Logo	应用领域
凌特 - Linear		稳压器开关
页数	文件大小	规格书
12页	187K
描述
Adjustable Output TFT-LCD Triple Switching Regulator

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中文翻译

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LT1947_1 数据手册

LT1947

Adjustable Output TFT-LCD

Triple Switching Regulator

DESCRIPTIO

FEATURES

The LT^®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’s 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’s final value to the rising edge at

the V_ONpin. 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

10-lead MSOP and thermally enhanced 10-lead MSOP

packages.

■

Complete Solution Under 1.2mm

■

Develops Three Outputs from a 3.3V or 5V Supply

■

Externally Programmable V_ONDelay

■

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_DDand V_ONVoltages

■

Tiny 10-Lead MSOP and Thermally Enhanced

10-Lead MSOP Packages

APPLICATIO S

■

TFT-LCD Notebook Display Panels

■

TFT-LCD Desktop Monitor Display Panels

■

Digital Cameras

Handheld Computers

■

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

All other trademarks are the property of their respective owners.

TYPICAL APPLICATIO

OFF

–8V

10mA

0.68µF

CERAMIC

200mA

0.68µF

3.3µH

Start-Up Waveforms

4.7µH

53.6k

SW1

FB1

V_SHDN

5V/DIV

3.3µF

CERAMIC

×2

SW2

2.2µF

V_ON

20V/DIV

10k

CERAMIC

LT1947

182k

220nF

FB2

24V

GND

AV_DD

10V/DIV

10mA

10k

SHDN

SHUTDOWN

10nF

V_OFF

10V/DIV

C1: TAIYO YUDEN LMK316BJ225MD

C2: TAIYO YUDEN LMK325BJ335MD ×2

C3: AVX 0.22µF 25V X7R

D1: MBRM120LT3

D2: CMDSH-3

D3, D4: BAT54S DUAL DIODE

L1: SUMIDA CLQ4D103R3

L2: TAIYO YUDEN LB2012B4R7M

2ms/DIV

1947 TA01.tif

1947 F01

C4, C6: TAIYO YUDEN LMK107BJ684MA

Figure 1. 3.3V Powered TFT-LCD Bias Generator

1947fa

12 3 4 5 6 7...12

中文翻译

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与LT1947_1相关器件

型号	品牌	获取价格	描述	数据表
LT1947EMS	Linear	获取价格	Adjustable Output TFT-LCD Triple Switching Regulator
LT1947EMS#PBF	Linear	获取价格	LT1947 - Adjustable Output TFT-LCD Triple Switching Regulator; Package: MSOP; Pins: 10; Te
LT1947EMS#TRPBF	Linear	获取价格	LT1947 - Adjustable Output TFT-LCD Triple Switching Regulator; Package: MSOP; Pins: 10; Te
LT1947EMSE	Linear	获取价格	Adjustable Output TFT-LCD Triple Switching Regulator
LT1947EMSE#PBF	Linear	获取价格	LT1947 - Adjustable Output TFT-LCD Triple Switching Regulator; Package: MSOP; Pins: 10; Te
LT1947EMSE#TR	Linear	获取价格	LT1947 - Adjustable Output TFT-LCD Triple Switching Regulator; Package: MSOP; Pins: 10; Te
LT1947EMSE#TRPBF	Linear	获取价格	LT1947 - Adjustable Output TFT-LCD Triple Switching Regulator; Package: MSOP; Pins: 10; Te
LT1948	Linear	获取价格	DC/DC Converter for TFT-LCD Panels
LT1948	Linear Systems	获取价格	DC/DC Converter for TFT-LCD Panels
LT1948EMS8	Linear Systems	获取价格	DC/DC Converter for TFT-LCD Panels

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