1

LT1615/LT1615-1

sn16151 16151fas

Micropower Step-Up

DC/DC Converters

in ThinSOT

The LT

converters in a 5-lead low profile (1mm) ThinSOT pack-

age. 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

µAatno

load, which further reduces to 0.5

µA in shutdown. A

current limited, fixed off-time control scheme conserves

operating current, resulting 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’s low off-time of 400ns permits the use of tiny, low

profile inductors and capacitors to minimize footprint and

cost in space-conscious portable applications.

s

Low Quiescent Current:

20

<1

s

s

s

Uses Small Surface Mount Components

s

High Output Voltage: Up to 34V

s

Low Profile (1mm) ThinSOT

s

LCD Bias

s

Handheld Computers

s

Battery Backup

s

Digital Cameras

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

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

SW

FB

LT1615

2.5V TO 4.2V

L1

10

µH

D1

SHDN

R2

130k

R1

2M

C2

1

µF

20V

12mA

C1: TAIYO YUDEN LMK316BJ475

C2: TAIYO YUDEN TMK316BJ105

D1: MOTOROLA MBR0530

L1: MURATA LQH3C100K24

1615/-1 TA01

GND

C1

4.7

µF

Efficiency

LOAD CURRENT (mA)

0.1

0.3

1

3

10

30

1615/-1 TA01a

85

80

75

70

65

60

55

50

APPLICATIO S

FEATURES

TYPICAL APPLICATIO

DESCRIPTIO

ThinSOT is a trademark of Linear Technology Corporation.