TCM828ECT713 Datasheet, PDF (1/9 Pages) Microchip Technology – Switched Capacitor Voltage Converters

TCM828
TCM829
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 50µA (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
PIN CONFIGURATION
*5-Pin SOT-23A
OUT 1
5 C+
VIN ₂ TCM828ECT
TCM829ECT
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.
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.
C^– 3
4 GND
NOTE: *5-Pin SOT-23A is equivalent to EIAJ SC-74A
TYPICAL OPERATING CIRCUIT
Voltage Inverter
C⁺
V_IN
C1
C^–
TCM828
TCM829
GND
OUT
INPUT
V^–
OUTPUT
C2
© 2001 Microchip Technology Inc. DS21488A
TCM828/829-4 5/22/00