TC682 Datasheet, PDF (1/6 Pages) TelCom Semiconductor, Inc – INVERTING VOLTAGE DOUBLER

EVALUATION
KIT
AVAILABLE
1
TC682
INVERTING VOLTAGE DOUBLER
FEATURES
s 99.9% Voltage Conversion Efficiency
s 92% Power Conversion Efficiency
s Wide Input Voltage Range ............... +2.4V to +5.5V
s Only 3 External Capacitors Required
s 185µA Supply Current
s Space-Saving 8-Pin SOIC and 8-Pin Plastic DIP
Packages
APPLICATIONS
s – 10V from +5V Logic Supply
s – 6V from a Single 3V Lithium Cell
s Portable Handheld Instruments
s Cellular Phones
s LCD Display Bias Generator
s Panel Meters
s Operational Amplifier Power Supplies
TYPICAL OPERATING CIRCUIT
VIN ^{+2.4V < VIN < +5.5V}
GND
+
C1
–
+
C2 _–
VIN
C1+
C1–
C2+ ^TC682
C2– ^VOUT
GND
VOUT = – (2 x VIN)
VOUT
+ ^COUT
All Caps = 3.3µF
TELCOM SEMICONDUCTOR, INC.
2
GENERAL DESCRIPTION
The TC682 is a CMOS charge pump converter that
provides an inverted doubled output from a single positive
supply. An on-board 12kHz (typical) oscillator provides the
clock and only 3 external capacitors are required for full
3 circuit implementation.
Low output source impedance (typically 140Ω), pro-
vides output current up to 10mA. The TC682 features low
quiescent current and high efficiency, making it the ideal
choice for a wide variety of applications that require a
negative voltage derived from a single positive supply (for
example: generation of – 6V from a 3V lithium cell or – 10V
generated from a +5V logic supply).
4 ^{The minimum external parts count and small physical}
size of the TC682 make it useful in many medium-current,
dual voltage analog power supplies.
ORDERING INFORMATION
Part No.
TC682COA
TC682CPA
TC682EOA
TC682EPA
TC7660EV
Package
Temp. Range
8-Pin SOIC
8-Pin Plastic DIP
8-Pin SOIC
0°C to +70°C
5 ^{0°C to +70°C}
– 40°C to +85°C
8-Pin Plastic DIP
– 40°C to +85°C
Evaluation Kit for
Charge Pump Family
PIN CONFIGURATIONS
8-Pin DIP
C1– 1
C2+ 2
C2– 3
VOUT ₄
TC682CPA
TC682EPA
C1– 1
C2+ 2
C2– 3
VOUT ₄
8-Pin SOIC
TC682COA
TC682EOA
6
8 ^NC
7 C1+
6 VIN
5 GND
7
8 NC
7 C1+
6 VIN
5 GND
TC682-2 8/21/96
4-21
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