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TCM828 Datasheet(PDF) 1 Page - Microchip Technology

Part No. TCM828
Description  Switched Capacitor Voltage Converters
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Maker  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
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TCM828 Datasheet(HTML) 1 Page - Microchip Technology

   
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TCM828/829-4 5/22/00
TCM828
TCM829
© 2001 Microchip Technology Inc.
DS21488A
Switched Capacitor Voltage Converters
FEATURES
s
Charge Pump in 5-Pin SOT-23A Package
s
>95% Voltage Conversion Efficiency
s
Voltage Inversion and/or Doubling
s
Low 50
µA (TCM828) Quiescent Current
s
Operates from +1.5V to +5.5V
s
Up to 25mA Output Current
s
Only Two External Capacitors Required
APPLICATIONS
s
LCD Panel Bias
s
Cellular Phones
s
Pagers
s
PDAs, Portable Dataloggers
s
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
(3.3
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,
power MOSFETs are integrated on-chip. Supply current
is 50
µA (TCM828) and 115µA (TCM829).
The TCM828 and TCM829 are available in a 5-Pin
SOT-23A surface mount package.
TYPICAL OPERATING CIRCUIT
ORDERING INFORMATION
Part No.
Package
Temp. Range
TCM828ECT
5-Pin SOT-23A
– 40
°C to +85°C
TCM829ECT
5-Pin SOT-23A
– 40
°C to +85°C
NOTE: 5-Pin SOT-23A is equivalent to EIAJ SC-74A.
PIN CONFIGURATION
TCM828
TCM829
VIN
V
OUTPUT
C+
C
C1
C2
INPUT
GND
OUT
C+
C–
OUT
TCM828ECT
TCM829ECT
1
2
3
5
GND
VIN
4
*5-Pin SOT-23A
NOTE: *5-Pin SOT-23A is equivalent to EIAJ SC-74A
Voltage Inverter


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