TCM828_10 datasheet(1/26 Pages) MICROCHIP

Part #	TCM828

Description	Switched Capacitor Voltage Converters

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Manufacturer	MICROCHIP [Microchip Technology]

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DS21488B-page 1

TCM828/TCM829

Features

• Charge Pump in 5-Pin SOT-23 Package

• >95% Voltage Conversion Efficiency

• Voltage Inversion and/or Doubling

• Low 50 µA (TCM828) Quiescent Current

• Operates from +1.5V to +5.5V

• Up to 25 mA Output Current

• Only Two External Capacitors Required

Applications

• LCD Panel Bias

• Cellular Phones

• Pagers

• PDAs, Portable Dataloggers

• Battery-Powered Devices

Typical Application Circuit

Description

The TCM828/TCM829 devices are CMOS “charge-

pump” voltage converters in ultra-small, 5-Pin SOT-23

packages. They invert and/or double an input voltage

which can range from +1.5V to +5.5V. Conversion

efficiency is typically >95%. Switching frequency is

12 kHz for the TCM828, and 35 kHz for the TCM829.

External component requirement is only two capacitors

(3.3 µF

nominal)

for

standard

voltage

inverter

applications. With a few additional components, a

positive doubler can also be built. All other circuitry,

including control, oscillator and power MOSFETs, are

integrated on-chip. Supply current is 50 µA (TCM828)

and 115 µA (TCM829).

The TCM828 and TCM829 devices are available in a

5-Pin SOT-23 surface mount package.

Package Type

Ordering Information

VIN

V-

OUTPUT

C+

C-

C1

C2

INPUT

GND

Voltage Inverter

OUT

Part No.

Package

Temperature

Range

TCM828ECT

5-Pin SOT-23

-40°C to +85°C

TCM828VT

5-Pin SOT-23

-40°C to +125°C

TCM829ECT

5-Pin SOT-23

-40°C to +85°C

Note:

5-Pin SOT-23 is equivalent to EIAJ

SC-74A.

C+

1

2

3

5

GND

4

C-

OUT

VIN

TCM828/TCM829

SOT-23

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