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TCM828

Microchip Technology
Part Number TCM828
Manufacturer Microchip Technology
Description Switched Capacitor Voltage Converters
Published Apr 23, 2005
Detailed Description TCM828 TCM829 Switched Capacitor Voltage Converters FEATURES s s s s s s s Charge Pump in 5-Pin SOT-23A Package >95% Vol...
Datasheet PDF File TCM828 PDF File

TCM828
TCM828


Overview
TCM828 TCM829 Switched Capacitor Voltage Converters FEATURES s s s s s s s 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 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.
APPLICATIONS s s s s s LCD Panel Bias Cellular Phones Pagers PDAs, Portable Dataloggers Battery-Powered Devices PIN CONFIGURATION *5-Pin SOT-23A ORDERING INFORMATION Part No.
Package 5-Pin SOT-23A 5-Pin SOT-23A Temp.
Range – 40°C to +85°C – 40°C to +85°C OUT 1 5 C+ TCM828ECT TCM829ECT NOTE: 5-Pin SOT-23A is equivalent to EIAJ SC-74A.
VIN 2 TCM828ECT TCM829ECT C– 3 4 GND NOTE: *5-Pin SOT-23A is equivalent to EIAJ SC-74A TYPICAL OPERATING CIRCUIT Voltage Inverter C+ C1 C– TCM828 TCM829 OUT GND C2 V– OUTPUT VIN INPUT © 2001 Microchip Technology Inc.
DS21488A TCM828/829-4 5/22/00 Switched Capacitor Voltage Converters TCM828 TCM829 ABSOLUTE MAXIMUM RATINGS* Input Voltage (VIN to GND) +6.
0V, – 0.
3V Output Voltage (OUT to GND) –6.
0V, + 0.
3V Current at OUT Pin 50mA Short-Circuit Duration – OUT to GND .
Indefinite Operating Temperature Ra...


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