TCM828 Datasheet

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  TCM828/829 Datasheet (10/22/2002)

FEATURES

Charge Pump in 5-Pin SOT-23A Package

>95% Voltage Conversion Efficiency

Voltage Inversion and/or Doubling

Low 50µA (TCM828) Quiescent Current

Operates from +1.5V to +5.5V

Up to 25mA Output Current

Only Two External Capacitors Required
APPLICATIONS

LCD Panel Bias

Cellular Phones

Pagers

PDAs, Portable Dataloggers

Battery-Powered Devices
GENERAL DESCRIPTION
The TCM828/829 are CMOS “charge-pump” voltage
converters in ultra-small  5-Pin SOT-23A 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 12kHz for the TCM828 and 35kHz for
the TCM829.
External component requirement is only two capacitors
(3.3µF nominal) for standard voltage inverter applications.
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 50µA (TCM828) and 115µA (TCM829).
The TCM828 and TCM829 are available in a 5-Pin
SOT-23A surface mount package.

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