TCM828/TCM829
Switched Capacitor Voltage Converters
Features
Description
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The TCM828/TCM829 devices are CMOS “chargepump” 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.
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
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).
Applications
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LCD Panel Bias
Cellular Phones
Pagers
PDAs, Portable Dataloggers
Battery-Powered Devices
The TCM828 and TCM829 devices are available in a
5-Pin SOT-23 surface mount package.
Package Type
Typical Application Circuit
TCM828/TCM829
SOT-23
Voltage Inverter
C+
C-
TCM828/TCM829
C1
VIN
INPUT
5
VIN
GND
C2
3
GND
2
C-
VOUTPUT
OUT
C+
4
OUT 1
Ordering Information
Package
Temperature
Range
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
Part No.
TCM828ECT
Note:
© 2010 Microchip Technology Inc.
5-Pin SOT-23 is equivalent to EIAJ
SC-74A.
DS21488B-page 1
