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LTC1502-3.3

Single Cell to 3.3V

Regulated Charge Pump

DC/DC Converter

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Input Voltage Range: 0.9V to 1.8V

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0.9V Guaranteed Start-Up Voltage

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Regulated Output Voltage: 3.3V

±4%

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No Inductors

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Low Operating Current: 40

µA

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Low Shutdown Current: 5

µA

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Short-Circuit and Overtemperature Protected

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Available in 8-Pin MSOP and SO Packages

The LTC

converter that produces a regulated 3.3V output from a

single alkaline cell input. It requires only five small external

capacitors—no inductors are required. Low supply cur-

rent (40

µA typical, 5µA in shutdown) and minimal external

components make the LTC1502-3.3 ideal for space and

power conscious single-cell applications. The total printed

circuit board area of the circuit shown below is less than

tive pull-down puts the part into shutdown mode. During

shutdown, the internal oscillator is stopped and the load is

once the pull-down resistance is removed.

The LTC1502-3.3 is short-circuit protected and survives

available in 8-pin MSOP and SO packages.

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

Output Voltage vs Input Voltage

1

2

3

1502-3.3 TA01

4

8

7

1

µF

6

5

GND

1

µF

SINGLE CELL

NiCd or

ALKALINE

10

µF

10

µF

10

µF

LTC1502-3.3

C2

Single Cell to 3.3V DC/DC Converter

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Pagers

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Battery Backup Supplies

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Portable Electronic Equipment

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Handheld Medical Instruments

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Glucose Meters

INPUT VOLTAGE (V)

0.8

3.3

3.4

3.5

1.6

1502-3.3 TA02

3.2

3.1

3.0

1.0

1.2

1.4

1.8

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO