1

TC1240

Positive Doubling Charge Pump with

Shutdown in SOT Package

TC1240-1 7/7/00

Positive Doubling Charge Pump with Shutdown

in SOT Package

GENERAL DESCRIPTION

The TC1240 is a doubling CMOS charge-pump voltage

converter in a small 6-Pin SOT-23A package. TC1240

doubles an input voltage which can range from +2.5V to

+4.0V. Conversion efficiency is typically >99%. Internal

oscillator frequency is 160kHz for the TC1240. The TC1240

has an active high shutdown which limits the current con-

sumption of the device to less than 1

µA.

External component requirement is only two capacitors

for standard voltage doubler applications. All other circuitry,

including control, oscillator, power MOSFETs are integrated

on-chip. Typical supply current is 180

µA and the device is

available in a 6-Pin SOT-23A surface mount package.

FEATURES

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Space Saving 6-Pin SOT-23A Package

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>99% Typical Voltage Conversion Efficiency

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Voltage Doubling

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Operates from +2.5V to +4.0V

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Low Output Resistance (17

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Only Two External Capacitors Required

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Consumes 180

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Power-Saving Shutdown Mode (1

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Fully Compliant with 1.8V Logic Sytems

APPLICATIONS

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Cellular Phones

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Pagers

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PDAs, Portable Dataloggers

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Battery-Powered Devices

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Handheld Instruments

ORDERING INFORMATION

Part

Number

Package

Temp. Range

TC1240ECH

6-Pin SOT-23A

–40

°C to +85°C

TC1240

TelCom Semiconductor reserves the right to make changes in the circuitry and specifications of its devices.

TYPICAL OPERATING CIRCUIT

PIN CONFIGURATION

Positive Voltage Doubler

TC1240

2 x INPUT

INPUT

GND

OUT

SHDN

OFF

ON

6-Pin SOT-23A

C+

C–

GND

TC1240ECH

1

2

3

6

OUT

4

5

SHDN

NOTE: *6-Pin SOT-23A is equivalent to EIAJ SC-74