TC828A-1

5/1/00 TelCom Semiconductor reserves the right to make changes in the circuitry and specifications of its devices.

TC828A

Switched Capacitor Voltage Converter

FEATURES

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Charge Pump in 5-Pin SOT-23A Package

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>95% Voltage Conversion Efficiency

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Voltage Inversion and/or Doubling

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Low 38

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Operates from +1.8V to +5.5V

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Up to 25mA Output Current

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Only Two External Capacitors Required

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Lower Power Version of TCM828

APPLICATIONS

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LCD Panel Bias

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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

GENERAL DESCRIPTION

The TC828A is a CMOS “charge-pump” voltage con-

verter in an ultra-small 5-Pin SOT-23A package. It can invert

and/or double an input voltage that can range from +1.8V to

+5.5V. Conversion efficiency is typically >95%, and switch-

ing frequency is 12KHz.

The external component requirement is only two ca-

pacitors (10

µF nominal) for standard voltage inverter appli-

cations.

With a few additional components a positive

doubler can also be built.

All other circuitry, including

control, oscillator, power MOSFETs are integrated on-chip.

Supply current is 38

µA typically.

The TC828A is available in a 5-Pin SOT-23A surface

mount package.

TYPICAL OPERATING CIRCUIT

ORDERING INFORMATION

Part No.

Package

Temp. Range

TC828AECT

5-Pin SOT-23A

– 40

°C to +85°C

NOTE: 5-Pin SOT-23A is equivalent to EIAJ-SC74A.

PIN CONFIGURATION

5-Pin SOT-23A

NOTE: *5-Pin SOT-23A is equivalent to EIAJ SC-74A

Voltage Inverter

TC828A

OUTPUT

INPUT

GND

OUT

C+

C–

OUT

TC828ECT

1

2

3

5

GND

VIN

4