Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
Advanced AMS682
Monolithic INVERTING VOLTAGE DOUBLER
Systems
FEATURES APPLICATIONS
• 99.9% Voltage Conversion Efficiency • Portable Handheld Instrumentation
• 92% Power Conversion Efficiency • Cellular Phones
• Wide Input Voltage Range +2.4V to 5.5V • Panel Meters
• 185 µA Supply Current • -10V from +5V logic Supply
• Available in SO-8 and PDIP Packages • -6V from a Single 3V Lithium Cell
• Only 3 external Capacitors Required • LCD Display Bias Generator
• Operational Amplifiers Power Supplies
GENERAL DESCRIPTION
The AMS682 is a CMOS charge pump converter that provides an inverted doubled output from a single positive supply.
Requiring only three external capacitors for full circuit implementation the device has an on -board 12kHz (typical) oscillator
which provides the clock.
Low output source impedance (typically 140 Ω), provides output current up to 10mA. The AMS682 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. The compact size and minimum external parts count of the AMS682 makes it useful in
many medium current, dual voltage analog power supplies.
The AMS682E is operational in the full industrial temperature range of -40 °C to 85 °C while AMS682C is operating over a
0 °C to 70 °C temperature range. The AMS682E/AMS682C are available in surface mount 8-Pin SOIC (SO-8) and 8-Pin
Plastic DIP (PDIP) packages.
ORDERING INFORMATION:
PACKAGE TYPE OPERATING
8 LEAD SOIC 8 LEAD PDIP TEMPERATURE RANGE
AMS682ES AMS682EP -40 to 85 ° C
AMS682CS AMS682CP 0 to 70 ° C
TYPICAL OPERATING CIRCUIT PIN CONFIGURATIONS
V IN
V OUT
GND
All Caps = 3.3 µF
V OUT = -(2 X V IN )
+2.4V < V IN < +5.5V
C 2
C 1
C OUT
+
+
-
-
+
V IN
V OUT
GND
C 1 +
C 2 +
C 1 -
C 2 -
ON/OFF
8-LEAD DIP/ 8-LEAD SOIC
AMS682
1
4
3
2
8
7
6
5
ON/OFF
C + 1
V IN
GNDV OUT
C - 2
C + 2
C - 2