Advanced Monolithic Systems, Inc.

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

Advanced

AMS2954

Monolithic

250mA LOW DROPOUT VOLTAGE REGULATOR

Systems

FEATURES

APPLICATIONS

•• 2.5V, 3.0V, 3.3V and 5.0V 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 (ADJ ONLY)

•• 1.24V to 29V Programmable Output

•• Error Flag Warning of Voltage Output Dropout

•• Logic Controlled Electronic Shutdown

GENERAL DESCRIPTION

The AMS2954 series 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.50mV at light loads and 380mV at 250mA)

thus prolonging battery life. The quiescent current increases only slightly in dropout. The AMS2954 has positive transient

protection up to 60V and can survive unregulated input transient up to 20V below ground. The AMS2954 was 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 reference.

The AMS2954 is available in the 3L TO-220 package, 3L TO-263, SOT-223, TO-252 and in 8-pin plastic SOIC and DIP

packages. In the 8L SOIC and PDIP packages the following additional features are offered: an error flag output warns of a low

output voltage, often due to failing batteries on input; the logic-compatible shutdown input enables the regulator to be switched

on and off; the device may be pin-strapped for a, 2.5, 3.0V, 3.3V or 5V output, or programmed from 1.24V to 29V with an

external pair of resistors.

ORDERING INFORMATION

PACKAGE TYPE

OPERATING

3 LEAD TO-220

3 LEAD TO-263

TO-252

SOT-223

8 LEAD SOIC

8 LEAD PDIP

TEMP. RANGE

AMS2954ACT-X AMS2954ACM-X AMS2954ACD-X AMS2954AC-X AMS2954ACS-X AMS2954CP-X

IND.

AMS2954CT-X

AMS2954CM-X

AMS2954CD-X

AMS2954C-X

AMS2954CS-X

AMS2954CP-X

IND

X = 2.5V, 3.0V, 3.3V, 5.0V

PIN CONNECTIONS

8L SOIC/ 8L PDIP

1

2

8

4

3

7

5

6 V

TAP

ERROR

FEEDBACK

OUTPUT

SENSE

SHUTDOWN

INPUT

GROUND

Top View

TAB IS

GND

TO-252 FRONT VIEW

1

2

3

1

2

3

TAB IS

GND

1

2

3

TAB IS

GND

3L TO-263 FRONT VIEW

OUTPUT

INPUT

OUTPUT

OUTPUT

INPUT

INPUT

3L TO-220 FRONT VIEW

SOT-223 TOP VIEW

INPUT GND

OUTPUT

GND

GND

1

2

3