Advanced
Monolithic
Systems
AMS2954
250mA LOW DROPOUT VOLTAGE REGULATOR
FEATURES
APPLICATIONS
· 2.5V, 3.0V, 3.3V and 5.0V Versions
· High Accuracy Output Voltage
· Extremely Low Quiescent Current
· Low Dropout Voltage
· Extremely Tight Load and Line Regulation
· Very Low Temperature Coefficient
· Current and Thermal Limiting
· Needs Minimum Capacitance (1mF) for Stability
· Unregulated DC Positive Transients 60V
ADDITIONAL FEATURES (ADJ ONLY)
· 1.24V to 29V Programmable Output
· Error Flag Warning of Voltage Output Dropout
· Logic Controlled Electronic Shutdown
· Battery Powered Systems
· Portable Consumer Equipment
· Cordless Telephones
· Portable (Notebook) Computers
· Portable Instrumentation
· Radio Control Systems
· Automotive Electronics
· Avionics
· Low-Power Voltage Reference
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
TO-252 SOT-223
OPERATING
TEMP. RANGE
IND.
8 LEAD SOIC
8 LEAD PDIP
3 LEAD TO-220 3 LEAD TO-263
AMS2954ACT-X AMS2954ACM-X AMS2954ACD-X AMS2954AC-X AMS2954ACS-X AMS2954CP-X
AMS2954CT-X AMS2954CM-X AMS2954CD-X AMS2954C-X AMS2954CS-X AMS2954CP-X
X = 2.5V, 3.0V, 3.3V, 5.0V
IND
SOT-223 TOP VIEW
3L TO-220 FRONT VIEW
PIN CONNECTIONS
3
2
1
OUTPUT
TAB IS
GND
GND
INPUT
8L SOIC/ 8L PDIP
1
2
3
OUTPUT
SENSE
1
2
3
4
8
7
6
5
INPUT
INPUT GND OUTPUT
FEEDBACK
VTAP
TO-252 FRONT VIEW
3L TO-263 FRONT VIEW
SHUTDOWN
GROUND
ERROR
OUTPUT
3
2
1
3
OUTPUT
GND
TAB IS
GND
TAB IS
GND
2
1
INPUT
INPUT
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
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