Advanced Monolithic Systems, Inc.

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

Advanced

AMS2950/AMS2951

Monolithic

150mA LOW DROPOUT VOLTAGE REGULATOR

Systems

FEATURES

APPLICATIONS

•• 5.0V, 3.3V, 3.0V and 2.5V Versions

•• Battery Powered Systems

•• High Accuracy Output Voltage

•• Portable Consumer Equipment

•• Extremely Low Quiescent Current

•• Cordless Telephones

•• Low Dropout Voltage

•• Portable (Notebook) Computers

•• Extremely Tight Load and Line Regulation

•• Portable Instrumentation

•• Very Low Temperature Coefficient

•• Radio Control Systems

•• Current and Thermal Limiting

•• Automotive Electronics

•• Needs Minimum Capacitance (1µµF) for Stability

•• Avionics

•• Unregulated DC Positive Transients 60V

•• Low-Power Voltage Reference

ADDITIONAL FEATURES (AMS2951 ONLY)

•• 1.24V to 29V Programmable Output

•• Error Flag Warning of Voltage Output Dropout

•• Logic Controlled Electronic Shutdown

GENERAL DESCRIPTION

The AMS2950 and AMS2951 are micropower voltage regulators ideally suited for use in battery-powered systems. These

devices feature very low quiescent current (typ.75µA), and very low dropout voltage (typ.45mV at light loads and 380mV at

150mA) thus prolonging battery life. The quiescent current increases only slightly in dropout. The AMS2950/AMS2951 has

positive transient protection up to 60V and can survive unregulated input transient up to 20V below ground.

The AMS2950 and AMS2951 were designed to include a tight initial tolerance (typ. 0.5%), 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

The AMS2950 is offered in the 3-pin TO-92 package. AMS2951 is available in 8-pin plastic SOIC and DIP packages and

offers three major additional system features. An error flag output warns of a low output voltage, often due to failing batteries

on input. The AMS2951 also features the logic-compatible shutdown input which enables the regulator to be switched on and

off. The AMS2951 device may be pin-strapped for a 5.0V, 3.3V, 3.0V or 2.5 output, or programmed from 1.24V to 29V with

an external pair of resistors.

ORDERING INFORMATION

PIN CONNECTION

PACKAGE TYPE

OPERATING

TO-92

8 LEAD PDIP

8 LEAD SOIC

TEMP. RANGE

AMS2950ACN-X AMS2951ACP- AMS2951ACS-X

IND.

AMS2950CN-X AMS2951CP-X AMS2951CS-X

IND

X = 3.3V, 3.0V, 2.5V

8L SOIC/ 8L PDIP

1

2

8

4

3

7

5

6 V

TAP

ERROR

FEEDBACK

OUTPUT

SENSE

SHUTDOWN

INPUT

GROUND

Top View

TO-92

OUTPUT

INPUT

GND

Bottom View