2002-2012 Microchip Technology Inc. DS21453D-page 1
TC682
Features:
• 99.9% Voltage Conversion Efficiency
• 92% Power Conversion Efficiency
• Wide Input Voltage Range:
- +2.4V to +5.5V
• Only 3 External Capacitors Required
• 185 A Supply Current
• Space-Saving 8-Pin SOIC and 8-Pin PDIP
Packages
Applications:
• -10V from +5V Logic Supply
• -6V from a Single 3V Lithium Cell
• Portable Handheld Instruments
• Cellular Phones
• LCD Display Bias Generator
• Panel Meters
• Operational Amplifier Power Supplies
Device Selection Table
General Description:
The TC682 is a CMOS charge pump converter that
provides an inverted doubled output from a single
positive supply. An on-board 12 kHz (typical) oscillator
provides the clock and only 3 external capacitors are
required for full circuit implementation.
Low output source impedance (typically 140),
provides output current up to 10 mA. The TC682 fea-
tures 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).
The minimum external parts count and small physical
size of the TC682 make it useful in many medium-
current, dual voltage analog power supplies.
Functional Block Diagram
Package Type
Part
Number
Package
Operating
Temp.
Range
TC682COA 8-Pin SOIC 0°C to +70°C
TC682CPA 8-Pin PDIP 0°C to +70°C
TC682EOA 8-Pin SOIC -40°C to +85°C
TC682EPA 8-Pin PDIP -40°C to +85°C
GND
+
–
+
–
+
GND
V
IN
V
OUT
= -(2 x V
IN
)
All Caps = 3.3 μF
TC682
+2.4V < V
IN
< +5.5V
V
OUT
C
1
+
V
IN
C
2
+
C
1
–
C
2
–
C
OUT
V
OUT
C
1
C
2
1
2
3
4
8
7
6
5
TC682CPA
TC682EPA
NC
GND
V
OUT
C
1
+
1
2
3
4
8
7
6
5
TC682COA
TC682EOA
8-Pin PDIP
8-Pin SOIC
V
IN
C
2
+
C
1
–
C
2
–
NC
GND
V
OUT
C
1
+
V
IN
C
2
+
C
1
–
C
2
–
Inverting Voltage Doubler
