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 (1 µF) 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
3TAB IS
GND
1
2
3TAB IS
GND
3L TO-263 FRONT VIEW
OUTPUT
INPUT
OUTPUT
OUTPUT
INPUT
INPUT
3L TO-220 FRONT VIEWSOT-223 TOP VIEW
INPUT GND OUTPUT
GND
GND
1 2 3