LT1944-1 Datasheet

IC型號：
LT1944-1
PDF描述：
Dual Micropower Step-Up DC/DC Converter
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155.28KB
PDF頁數(shù)：
8頁
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LT1944-1

Dual Micropower Step-Up

DC/DC Converter

FEATURES

DESCRIPTIO

Low Quiescent Current:

碌

A in Active Mode

碌

A in Shutdown Mode

Operates with V

as Low as 1.2V

Low V

CESAT

Switches: 85mV at 70mA

Uses Small Surface Mount Components

High Output Voltage: Up to 34V

Tiny 10-Pin MSOP Package

APPLICATIO S

Small TFT LCD Panels

Handheld Computers

Battery Backup

Digital Cameras

The LT

廬

1944-1 is a dual micropower step-up DC/DC

converter in a 10-pin MSOP package. One converter is

designed with a 100mA current limit and a 400ns off-time;

the other with a 175mA current limit and a 1.5碌s off-time.

The 1.5碌s off-time converter is ideal for generating an

output voltage that is close to the input voltage (i.e. a Li-

Ion to 5V converter, or a two-cell to 3.3V converter). With

an input voltage range of 1.2V to 15V, the LT1944-1 is ideal

for a wide variety of applications. Both converters feature

a quiescent current of only 20碌A(chǔ) at no load, which further

reduces to 0.5碌A(chǔ) in shutdown. A current limited, fixed off-

time control scheme conserves operating current, result-

ing in high efficiency over a broad range of load current.

Tiny, low profile inductors and capacitors can be used to

minimize footprint and cost in space-conscious portable

applications.

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

TYPICAL APPLICATIO

2.7V

TO 4.2V

22碌H

4.7碌F

SHDN1

SHDN2

LT1944-1

Triple Output Power Supply (5V, 15V, 鈥?0V) for LCD Displays

40mA

SW2

FB2

EFFICIENCY (%)

4.7碌F

FB1

178k

1碌F

15V

2.5mA

0.1碌F

1944-1 TA01

0.1

LOAD CURRENT (mA)

100

1944-1 TA01a

4.7pF

324k

GND PGND PGND SW1

4.7pF

22碌H

C1, C2: TAIYO YUDEN JMK212BJ475

C3, C4: TAIYO YUDEN EMK212BJ105

C5: TAIYO YUDEN EMK107BJ104

D1, D2, D3, D4: CENTRAL SEMI CMDSH3

L1, L2: MURATA LQH3C220

1碌F

鈥?0V

1mA

5V Output Efficiency

= 4.2V

= 2.7V

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