1

LT1316

Micropower

DC/DC Converter

with Programmable

Peak Current Limit

s

Precise Control of Peak Switch Current

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Quiescent Current:

33

µA in Active Mode

3

µA in Shutdown Mode

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Low-Battery Detector Active in Shutdown

s

s

8-Lead MSOP and SO Packages

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s

Logic Level Shutdown Pin

FEATURES

The LT

that operates from an input voltage as low as 1.5V. A

programmable input current limiting function allows pre-

cise control of peak switch current. Peak switch current

can be set to any value between 30mA and 500mA by

adjusting one resistor. This is particularly useful for

DC/DC converters operating from high source impedance

inputs such as lithium coin cells or telephone lines.

The fixed off-time, variable on-time regulation scheme

results in quiescent current of only 33

µA in active mode.

Quiescent current decreases to 3

µA in shutdown with the

low-battery detector still active.

The LT1316 is available in 8-lead MSOP and SO packages.

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

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Battery Backup

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LCD Bias

s

Low Power – 48V to 5V/3.3V Converters

2-Cell to 5V Step-Up Converter

SW

GND

FB

SHDN

65

8

1

4

3

2

7

LBO

LBI

LT1316

C2

47

µF

NC

NC

R5

10k

1%

C1

47

µF

2 CELLS

L1

47

µH

D1

5V

50mA

D1: MOTOROLA MBR0520L

L1: SUMIDA CD43-470

1316 TA01

+

+

R1

1M

1%

R2

324k

1%

LOAD CURRENT (mA)

0.1

60

80

90

1

10

100

1316 TA02

70

Efficiency vs Load Current