TC828A Datasheet, PDF (1/8 Pages) TelCom Semiconductor, Inc – Switched Capacitor Voltage Converter

TC828A
Switched Capacitor Voltage Converter
FEATURES
s Charge Pump in 5-Pin SOT-23A Package
s >95% Voltage Conversion Efficiency
s Voltage Inversion and/or Doubling
s Low 38µA Quiescent Current
s Operates from +1.8V to +5.5V
s Up to 25mA Output Current
s Only Two External Capacitors Required
s Lower Power Version of TCM828
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 TC828ECT
GENERAL DESCRIPTION
The TC828A is a CMOS “charge-pump” voltage con-
verter in an ultra-small 5-Pin SOT-23A package. It can invert
and/or double an input voltage that can range from +1.8V to
+5.5V. Conversion efficiency is typically >95%, and switch-
ing frequency is 12KHz.
The external component requirement is only two ca-
pacitors (10µF nominal) for standard voltage inverter appli-
cations. 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 38µA typically.
The TC828A is available in a 5-Pin SOT-23A surface
mount package.
ORDERING INFORMATION
Part No.
Package
Temp. Range
TC828AECT
5-Pin SOT-23A
– 40°C to +85°C
NOTE: 5-Pin SOT-23A is equivalent to EIAJ-SC74A.
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^–
TC828A
INPUT
GND
OUT
V^–
OUTPUT
C2
TC828A-1 5/1/00 TelCom Semiconductor reserves the right to make changes in the circuitry and specifications of its devices.