Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
Advanced
Monolithic
Systems
AMS682
INVERTING VOLTAGE DOUBLER
FEATURES
99.9% Voltage Conversion Efficiency
92% Power Conversion Efficiency
Wide Input Voltage Range +2.4V to 5.5V
185
μ
A Supply Current
Available in SO-8 and PDIP Packages
Only 3 external Capacitors Required
APPLICATIONS
Portable Handheld Instrumentation
Cellular Phones
Panel Meters
-10V from +5V logic Supply
-6V from a Single 3V Lithium Cell
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
), 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
8 LEAD SOIC
AMS682ES
AMS682CS
OPERATING
TEMPERATURE RANGE
-40 to 85
°
C
0 to 70
°
C
8 LEAD PDIP
AMS682EP
AMS682CP
TYPICAL OPERATING CIRCUIT PIN CONFIGURATIONS
V
IN
V
OUT
GND
All Caps = 3.3
μ
F
V
OUT
= -(2 X V
IN
)
+2.4V < V
IN
< +5.5V
C
2
C
1
C
OUT
+
+
-
-
+
V
ON/OFF
V
OUT
GND
C
1
+
C
2
+
C
1
-
C
2
-
8-LEAD DIP/ 8-LEAD SOIC
AMS682
1
4
3
2
8
7
6
5
ON/OFF
C
+
1
V
IN
GND
V
OUT
C
-
2
C
+
2
C
-
2