TC682_13 Datasheet, PDF (1/14 Pages) Microchip Technology – Inverting Voltage Doubler

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 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
Part
Number
Package
TC682COA
TC682CPA
TC682EOA
TC682EPA
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
Package Type
8-Pin PDIP
C₁^– 1
8 NC
C₂⁺ 2 _TC682CPA 7 C₁⁺
C₂^– 3 ^TC682EPA 6 ^VIN
V_OUT 4
5 GND
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
V_IN ^{+2.4V < VIN < +5.5V}
GND
+
C₁
–
+
C₂
–
V_IN
C₁⁺
C₁^–
TC682
C₂⁺
C₂^–
V_OUT
GND
V_OUT = -(2 x V_IN )
V_OUT
C_OUT
+
All Caps = 3.3 μF
8-Pin SOIC
C₁^– 1
8 NC
C₂⁺ 2 _TC682COA 7 C₁⁺
C₂^{– 3 TC682EOA 6 V}IN
V_OUT 4
5 GND
 2002-2012 Microchip Technology Inc.
DS21453D-page 1