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

•• 185µµA 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

+2.4V < V

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

1

V

IN

GND

V

OUT

2

2

2