TC682
Inverting Voltage Doubler
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
μA
Supply Current
• Space-Saving 8-Pin SOIC and 8-Pin PDIP
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 12 kHz (typical) oscillator
provides the clock and only 3 external capacitors are
required for full circuit implementation.
Low output source impedance (typically 140Ω),
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.
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
Functional Block Diagram
V
IN
+2.4V < V
IN
< +5.5V
Device Selection Table
Part
Number
TC682COA
TC682CPA
TC682EOA
TC682EPA
Package
8-Pin SOIC
8-Pin PDIP
8-Pin SOIC
8-Pin PDIP
Operating
Temp.
Range
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
V
IN
C
1
+
–
C
1
+
C
1
–
TC682
C
2
+
–
C
2
+
C
2
–
V
OUT
GND
+
GND
All Caps = 3.3
μF
V
OUT
= -(2 x V
IN
)
V
OUT
C
OUT
Package Type
8-Pin PDIP
C
1
– 1
C
2
+ 2
C
2
– 3
V
OUT
4
TC682CPA
TC682EPA
8
7
6
5
NC
C
1
+
V
IN
GND
C
1
–
C
2
+
C
2
–
V
OUT
1
2
3
4
TC682COA
TC682EOA
8-Pin SOIC
8
7
6
5
NC
C
1
+
V
IN
GND
©
2006 Microchip Technology Inc.
DS21453C-page 1
MICROCHIP [ MICROCHIP TECHNOLOGY ]
