Datasheet > LT1948

LT1948

更新时间： 2024-10-03 05:43:27

品牌	Logo	应用领域
凌特 - Linear		转换器
页数	文件大小	规格书
4页	208K
描述
DC/DC Converter for TFT-LCD Panels

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LT1948 数据手册

Final Electrical Specifications

LT1948

DC/DC Converter for

TFT-LCD Panels

OBSOLETE:

Contact Linear Technology for Potential Replacement

FOR INFORMATION PURPOSES ONLY

August 2000

FEATURES

DESCRIPTIO

The LT^®1948 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 while the second regulator generates 23V at up to

10mA for positive bias. A simple level-shift charge pump

off the main switch node generates the negative bias

voltage. An external capacitor sets the delay time from

AV_DDreaching final value to 23V appearing at the V_ONpin.

The 3MHz switching frequency allows the use of tiny low

profile chip inductors and capacitors throughout, provid-

ingalownoise,lowcosttotalsolutionwithallcomponents

under 1.25mm in height. The device operates from an

input range of 2.6V to 6V and is available in an 8-lead

MSOP package.

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

Operates at 3MHz Switching Frequency

Fast Transient Response

Few External Components Required

2.6V to 6V Input Range

Tiny 8-Lead MSOP Package

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.

TYPICAL APPLICATIO

BAT54S

D3A

D3B

OFF

–8V

15mA

1µF

0.22µF

Start-Up Waveforms

L1, 2.2µH

L2, 2.2µH

MBRM120

V_IN

5V/DIV

2.5V TO

260mA

V_ON

20V/DIV

53.6k

2.2µH

2.2µF

SW1

SW2

FB1

10k

LT1948

AV_DD

10V/DIV

CMDSH-3

VO2

23V

10mA

GND

0.22µF

22nF

V_OFF

10V/DIV

2ms/DIV

1948 TA01a

C1, C2: TAIYO YUDEN LMK212BJ225

C3: TAIYO YUDEN TMK316BJ224

C4: TAIYO YUDEN EMK212BJ224

C5: TAIYO YUDEN LMK212BJ105

L1–L3: TAIYO YUDEN LB2012-2R2

1948 F01

Figure 1. 3.3V Powered TFT-LCD Bias Generator

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.

12 3 4

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与LT1948相关器件

型号	品牌	获取价格	描述	数据表
LT1948EMS8	Linear Systems	获取价格	DC/DC Converter for TFT-LCD Panels
LT1948EMS8	Linear	获取价格	DC/DC Converter for TFT-LCD Panels
LT1948EMS8#TR	Linear	获取价格	IC 1.5 A SWITCHING REGULATOR, 3600 kHz SWITCHING FREQ-MAX, PDSO8, PLASTIC, MSOP-8, Switchi
LT1948EMS8#TRPBF	Linear	获取价格	IC 1.5 A SWITCHING REGULATOR, 3600 kHz SWITCHING FREQ-MAX, PDSO8, PLASTIC, MSOP-8, Switchi
LT1949	Linear	获取价格	600kHz, 1A Switch PWM DC/DC Converter
LT1949	ADI	获取价格	600kHz、1A 开关 PWM DC/DC 转换器
LT1949-1	Linear	获取价格	1.4A, 1.5MHz Synchronous Step-Up DC/DC Converter with Output Disconnect
LT1949-1EMS8	Linear	获取价格	1.1MHz, 1A Switch PWM DC/DC Converter
LT1949-1EMS8#PBF	Linear	获取价格	IC 1.5 A SWITCHING REGULATOR, 1350 kHz SWITCHING FREQ-MAX, PDSO8, PLASTIC, MSOP-8, Switchi
LT1949-1EMS8#TRPBF	Linear	获取价格	IC 1.5 A SWITCHING REGULATOR, 1350 kHz SWITCHING FREQ-MAX, PDSO8, PLASTIC, MSOP-8, Switchi

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