Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
Advanced AMS2501/AMS2502
Monolithic 1A VERY LOW DROPOUT VOLTAGE REGULATORS
Systems
FEATURES APPLICATIONS
• Adjustable or Fixed Output • High Efficiency Current Regulators
1.5V, 1.8V, 2.5V, 2.85V, 3.0V, 3.3V, 3.5V and 5.0V • Post Regulators for Switching Supplies
• Output Current of 1A • Audio/Video/Modem Card Supply
• Low Dropout, typ. 200mV at 500mA Output Current • Adjustable Power Supply
• Fast Transient Response • Notebook/Personal Computer Supplies
• Remote Sense
GENERAL DESCRIPTION
The The AMS2501/AMS2502 series of adjustable and fixed low dropout voltage regulators are designed to provide 1A output
current. The dropout voltage of the device is 100mV at light loads and rising to 200mV at 500mA output current. A second
input voltage of 1.2V or greater than the output is required to achieve this dropout. The AMS2501/AMS2502 can also be used
as a single supply device by connecting pin1 and pin 8 together. In this case the dropout voltage will be typically 1.2V.
New features have been added to the AMS2501: a remote Sense pin is brought out virtually eliminating output voltage
variations due to load changes. AMS2502 has an additional feature of an On/Off pin to keep the device in stand-by mode.
The typical load regulation, measured at the Sense pin, for a load current step of 100mA to 1A is less than 1mV.
The AMS2501/AMS2502 series has fast transient response. On the AMS2502 the reference voltage is brought out to allow
the user to add a bypass capacitor for lower noise and transient response improvement.
The AMS2501/AMS2502 series are ideal for generating supplies of 1.25V to 3V where both 5V and 3.3V supplies are
available.
The AMS2501/AMS2502 devices are offered in 8 lead SOIC package.
ORDERING INFORMATION: PIN CONNECTIONS

PACKAGE TYPE OPERATING JUNCTION
8 LEAD SO-8 TEMPERATURE RANGE
AMS2501CS AMS2502CS 0 to 125 ° C
AMS2501CS-1.5 AMS2502CS-1.5 0 to 125 ° C
AMS2501CS-1 .8 AMS2502CS-1.8 0 to 125 ° C
AMS2501CS-2.5 AMS2502CS-2.5 0 to 125 ° C
AMS2501CS-2.85 AMS2502CS-2.85 0 to 125 ° C
AMS2501CS-3.0 AMS2502CS-3.0 0 to 125 ° C
AMS2501CS-3.3 AMS2502CS-3.3 0 to 125 ° C
AMS2501CS-3.5 AMS2502CS-3.5 0 to 125 ° C
AMS2501CS-5.0 AMS2502CS-5.0 0 to 125 ° C

AMS2501 8L SOIC
1
2
8
4
3
7
5
6 ADJ/GND
N/C
N/C
POWER IN
OUTPUT
OUTPUT
CONTROL IN
SENSE
Top View
AMS2502 8L SOIC
1
2
8
4
3
7
5
6 ADJ/GND
ON/OFF
BYPASS
POWER IN
OUTPUT
OUTPUT
CONTROL IN
SENSE
Top View