TCM828 데이터 시트보기 (PDF) - Microchip Technology

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TCM828

Switched Capacitor Voltage Converters

Microchip Technology 

TCM828/TCM829

Switched Capacitor Voltage Converters

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

Voltage Inverter

C+

VIN

C1

C-

INPUT

GND

OUT

V-

OUTPUT

C2

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

TCM828/TCM829

SOT-23

OUT 1

5 C+

VIN 2

C- 3

4 GND

Ordering Information

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.

© 2010 Microchip Technology Inc.

DS21488B-page 1

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