Advanced Monolithic Systems, Inc.

6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140

Advanced

AMS2942

Monolithic

HIGH VOLTAGE LOW DROPOUT REGULATOR

Systems

FEATURES

APPLICATIONS

•• Adjustable from 1.23V to 42V

•• Telephone Systems

•• High Accuracy Output Voltage

•• High Voltage Power Supply

•• Extremely Low Quiescent Current

•• Cordless Telephones

•• Low Dropout Voltage

•• Laboratory Instrumentation

•• Tight Load and Line Regulation

•• Radio Control Systems

•• Low Temperature Coefficient

•• Automotive Electronics

•• Current and Thermal Protection

•• Avionics

•• Unregulated DC Positive Transients 60V

•• Error Flag Warning of Voltage Output Dropout

•• Logic Controlled Electronic Shutdown

GENERAL DESCRIPTION

The AMS2942 are micropower voltage regulators ideally suited for use with high voltage powered systems. This device

feature very low quiescent current (typ.130µA), and very low dropout voltage (typ.45mV at light loads and 380mV at

100mA). The quiescent current increases only slightly in dropout. The AMS2942 has positive transient protection up to 60V

and can survive unregulated input transient up to 20V below ground.

AMS2942 is designed with a tight initial voltage reference tolerance, excellent load and line regulation (typ. 0.05%), and a

very low output voltage temperature coefficient, making these devices useful as a low-power voltage regulator in telephone

applications, using the telephone line as a power source.

The AMS2942 is available in a special 8-pin plastic SOIC in which pin 2 and 3 are fused together with the package paddle

serving also as heat sink. An error flag output warns of a low output voltage, often due to failing voltage on input line. A

logic-compatible shutdown input is available, which enables the regulator to be switched on and off. The output voltage can

be programmed from 1.23V to 42V with an external pair of resistors.

ORDERING INFORMATION

PIN CONNECTION

PACKAGE TYPE

OPERATING

8 LEAD SOIC

TEMP. RANGE

AMS2942AS

IND

AMS2942BS

IND

8L SOIC

1

2

8

4

7

5

6

N/C

ERROR

FEEDBACK

OUTPUT

INPUT

GROUND

3

ON/OFF

GROUND

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