AS1521
300mA Low Dropout Voltage Regulator
(PRELIMINARY INFORMATION)
FEATURES
•
1% Output Accuracy @ 2.5V, 3.3V, 5V, @ 300mA Output
•
Very Low Quiescent Current
•
0.42V (Typ.) Dropout Voltage @ 300mA
•
Extremely Tight Load And Line Regulation
•
Current & Thermal Limiting
•
Logic-Controlled Electronic Shutdown
•
Reverse Battery Protection
•
Output Programmable From 1.24 To 20V
•
Equivalent Replacement For LT1521
APPLICATIONS
•
Battery Powered Systems
•
Cordless Telephones
•
Radio Control Systems
•
Portable/Palm Top/Notebook Computers
•
Portable Consumer Equipment
•
Portable Instrumentation
•
Bar Code Scanners
•
SMPS Post-Regulator
•
Voltage Reference
•
Automotive Electronics
PRODUCT DESCRIPTION
The AS1521 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 AS1521 features very low quiescent current and very low
dropout voltage. This includes a tight initial tolerance of
±
1% max, and very low output temperature coefficient, making the AS1521
useful as a low-power voltage reference.
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.
The AS1521 is offered in a SO-8, SOT-252, TO-223, TO-220 & TO-263 packages.
ORDERING INFORMATION
SO-8
AS1521S-X
TO-252
AS1521R-X
SOT-223
3-PIN
AS1521M3-X
TO-220
3-PIN
AS1521U-X
TO-263
3-PIN
AS1521T-X
Oper. Temp.
Range
-40°C to +125°C
X= Output Voltage (2.5V, 3.3V, 5.0V, or Blank for Adj.)
PIN CONNECTIONS
8-Pin Surface Mount (S)
V
OUT
SENSE/ ADJ
GND
ERROR
1
2
3
4
8
7
V
IN
GND
1
6
5
GND
SHDN
V
IN
GND V
OUT
SOT-223 (M3)
TO-263-3 (T)
TO-220-3 (U)
TO-252 (R)
3
2
1
V
IN
GND
V
OUT
AS1521
2
3
1
AS1521
2
3
AS1521
AS1521
1
2
3
Front View
V
OUT
GND V
IN
Top View
Top View
SHDN
V
OUT
Top View
V
OUT
GND V
IN
<0.25V
>2.8V
NC
OFF
ON
ON
Front View
AS1521
Rev. 10/11/00
SIPEX [ SIPEX CORPORATION ]
