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Input Can Withstand -20V Reverse Battery & +60 Positive Transient
PRODUCT DESCRIPTION
The AS2954 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 AS2954 features very low quiescent current (75碌A(chǔ) Typ.) and
very low dropout voltage. This includes a tight initial tolerance of
鹵
0.5% max and
鹵
1% max., and very low output temperature
coefficient, making the AS2954 useful as a low-power voltage reference. The key AS2954 features include protection against reversed
battery, fold-back current limiting, and automotive load dump protection (60V positive transient).
The error flag output feature is used as power-on reset for warning of a low output voltage, due to falling voltage input of batteries.
Another feature is the logic compatible shutdown input which enables the regulator to be switched on and off. The AS2954 is offered
in a 3-pin TO-92and TO-263 package compatible with other 5 volt regulators, in 8-Pin plastic, SO-8, (same pin out as AS2951), TO-
220 and TO-263.
The regulator output voltage (of the 8-pin) may be pin-strapped for a 5Vand 3.3V or programmed from 1.24V to 29V with an external
pair of resistors. Look for AS2951 for 150mA and LP2951 for 100mA applications.
PIN CONNECTIONS
TO-263-3 Package
TO-263-5 Package
8-Pin Surface Mount (S)
OUTPUT
1
2
3
4
AS2954
8
7
6
5
INPUT
FEEDBACK
5V, 3.3V TAP
ERROR
1
SOT-223 Package
TO-220-3 Package
TO-220-5 Package
AS2954
1
2
3
AS2954
1 2 3 4 5
1) INPUT
2)
3)
4)
5)
OUTPUT
GND
SHUTDOWN
ERROR
SENSE
SHUTDOWN
GND
AS2954
2
3
AS2954
AS2954
1) INPUT
2) OUTPUT
Top View
TO-92 (N)
1
2
3
V
IN
GND
V
OUT
3) GND
4) SHUTDOWN
5) ERROR
1 2 3
V
IN
GND V
OUT
1 2 3 4 5
Front View
V
ADJ
V
OUT
V
IN
Top View
Top View
Front View
OUTPUT
GND
INPUT
Front View
Bottom View
Rev.9/29/00
1
2
3
4
5
6
