EVALUATION
KIT
AVAILABLE
1
TC682
INVERTING VOLTAGE DOUBLER
FEATURES
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99.9% Voltage Conversion Efficiency
92% Power Conversion Efficiency
Wide Input Voltage Range ............... +2.4V to +5.5V
Only 3 External Capacitors Required
185
碌
A Supply Current
Space-Saving 8-Pin SOIC and 8-Pin Plastic DIP
Packages
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
circuit implementation.
Low output source impedance (typically 140鈩?, 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 鈥?6V from a 3V lithium cell or 鈥?10V
generated from a +5V logic supply).
The minimum external parts count and small physical
size of the TC682 make it useful in many medium-current,
dual voltage analog power supplies.
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7
NC
C1+
VIN
GND
TC682-2 8/21/96
APPLICATIONS
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鈥?10V from +5V Logic Supply
鈥?6V from a Single 3V Lithium Cell
Portable Handheld Instruments
Cellular Phones
LCD Display Bias Generator
Panel Meters
Operational Amplifier Power Supplies
ORDERING INFORMATION
Part No.
TC682COA
TC682CPA
TC682EOA
TC682EPA
TC7660EV
Package
8-Pin SOIC
8-Pin Plastic DIP
8-Pin SOIC
8-Pin Plastic DIP
Evaluation Kit for
Charge Pump Family
Temp. Range
0擄C to +70擄C
0擄C to +70擄C
鈥?40擄C to +85擄C
鈥?40擄C to +85擄C
TYPICAL OPERATING CIRCUIT
VIN
+2.4V < VIN < +5.5V
PIN CONFIGURATIONS
C1+
C1鈥?/div>
C2+
C2鈥?/div>
TC682
VOUT
GND
VOUT = 鈥?(2 x VIN )
VOUT
+
COUT
C1鈥?1
C2+ 2
C2鈥?3
VOUT
4
TC682COA
TC682EOA
VIN
C1鈥?/div>
C2+
C2鈥?/div>
VOUT
1
2
3
4
8-Pin DIP
8
7
TC682CPA
TC682EPA
6
5
NC
C1+
VIN
GND
+
C1
鈥?/div>
+
C2
鈥?/div>
8-Pin SOIC
GND
All Caps = 3.3
碌
F
6
5
8
4-21
TELCOM SEMICONDUCTOR, INC.
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