AS2931
100mA Low Dropout Voltage Regulator
FEATURES
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5.0V, 4.5V, 4.0V, 3.5V, 3.3V, and 3.0V Versions are Available
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Reverse Battery Protection
Short Circuit Protection
Output Current in Excess of 100 mA
Input-Output Differential is Less Than 0.6V
Mirror-Image Insertion Protection
60V Load Dump Protection
-20V Reverse Transient Protection
Internal Thermal Overload Protection
APPLICATION
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Available in TO-220, TO-92, SOT-89, and SO-8 Package Types
Available as Adjustable with TTL Compatible Switch
Similar Improved to Industry Standard LM2931
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Portable Instrumentation
Radio Control Systems
Cordless Telephones
PRODUCT DESCRIPTION
The AS2931 is a low power voltage regulator. This device is an excellent choice for use in battery-powered applications such as
cordless telephones, radio control systems, and portable computers. The AS2931 features offers very low quiescent currents
(0.4 mA.), and very low drop output voltage (typ. 50 mV at light load and 300 mV at 100 mA). Other features include the logic-
compatible On/Off input which enables the regulator to be switched on and off. The AS2931 is offered in a 3-pin TO-92/TO-220
package compatible with other 5V regulators and SOT-89/SO-8 package.
The regulator output voltage may be internally pin-strapped for a 3.5V, 3.3V, 3.0V, or programmed from 3V to 24V with an external
pair of resistors.
PIN CONNECTIONS
ORDERING INFORMATION
TO-92
SO-8
SOT-89
3-PIN
TO-220
3/5 PIN
OPER. TEMP.
RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
3-PIN
8-Pin Surface Mount (S)
Fixed Output
AS2931AN-X
AS2931N-X
AS2931AS-X
AS2931S-X
AS2931CS-X
AS2931AM1-X AS2931AU-X
AS2931M1-X
AS2931U-X
AS2931CU-X
VOUT
GND
GND
BYP
1
2
3
4
8
7
6
5
VIN
GND
GND
AS2931
X = Output Voltages (X = 3.0V, 3.3V, 3.5V)
or blank for Adj.)
ON/OFF
TO-92 (N)
SOT-89 (M1)
AS2931
TO-220-3 (U)
Fixed
Top View
1
2
3
8-Pin Surface Mount (S)
Adj Output
1
3
2
VOUT
VIN
AS2931
VOUT
GND
GND
1
2
3
4
8
7
6
5
VIN
GND
VIN
GND VOUT
1
2
3
1. V
2. GND
3. VOUT
IN
GND
GND
AS2931
Top View
Bottom View
ON/OFF
ADJ
Front View
Top View
Rev. 10/11/00