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LT1615/LT1615-1

Micropower Step-Up

DC/DC Converters

in SOT-23

FEATURES

s

DESCRIPTIO

s

s

s

s

s

Low Quiescent Current:

20

碌

A in Active Mode

<1

碌

A in Shutdown Mode

Operates with V

IN

as Low as 1V

Low V

CESAT

Switch: 250mV at 300mA

Tiny 5-Lead SOT-23 Package

Uses Small Surface Mount Components

High Output Voltage: Up to 34V

APPLICATIO S

s

s

s

s

LCD Bias

Handheld Computers

Battery Backup

Digital Cameras

The LT

廬

1615/LT1615-1 are micropower step-up DC/DC

converters in a 5-lead SOT-23 package. The LT1615 is

designed for higher power systems with a 350mA current

limit and an input voltage range of 1.2V to 15V, whereas

the LT1615-1 is intended for lower power and single-cell

applications with a 100mA current limit and an extended

input voltage range of 1V to 15V. Otherwise, the two

devices are functionally equivalent. Both devices 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.

The 36V switch allows high voltage outputs up to 34V to

be easily generated in a simple boost topology without the

use of costly transformers. The LT1615鈥檚 low off-time of

400ns permits the use of tiny, low profile inductors and

capacitors to minimize footprint and cost in space-con-

scious portable applications.

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

TYPICAL APPLICATIO

L1

10碌H

1-Cell Li-Ion to 20V Converter for LCD Bias

85

D1

20V

12mA

SW

LT1615

SHDN

C1

4.7碌F

GND

FB

R2

130k

1615/-1 TA01

V

IN

2.5V TO 4.2V

V

IN

80

V

IN

= 4.2V

75

EFFICIENCY (%)

R1

2M

C2

1碌F

70

65

60

55

50

0.1

C1: TAIYO YUDEN LMK316BJ475

C2: TAIYO YUDEN TMK316BJ105

D1: MOTOROLA MBR0530

L1: MURATA LQH3C100K24

0.3

U

Efficiency

V

IN

= 2.5V

V

IN

= 3.3V

1

3

10

LOAD CURRENT (mA)

30

1615/-1 TA01a

U

U

1

next

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