AS1129
500mA Low Dropout Voltage Regulator
(PRELIMINARY INFORMATION)
FEATURES
APPLICATIONS
• Battery Powered Systems
• Cordless Telephones
• 1% Output Accuracy 2.5V, 3.3V, 5V, @ 500mA Output
• Very Low Quiescent Current
• 0.4V Dropout Voltage
• Radio Control Systems
• Portable/Palm Top/Notebook Computers
• Portable Consumer Equipment
• Portable Instrumentation
• Bar Code Scanners
• 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 LT1129
• SMPS Post-Regulator
• Voltage Reference
• Automotive Electronics
PRODUCT DESCRIPTION
The AS1129 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 AS1129 features very low quiescent current and very low
dropout voltage of 0.4 volts. This includes a tight initial tolerance of 1% max, and very low output temperature coefficient, making
the AS1129 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 AS1129 is offered TO-92, SOT-223, TO-220, TO-252 and TO-263 in 3 & 5 leads.
ORDERING INFORMATION
TO-92
SOT-223
TO-220
3-PIN
TO-263
3/5-PIN
AS1129T-X
TO-263
5-PIN
AS1129T3-X
TO-252
3/5-PIN
AS1129R-X
Oper. Temp.
Range
-40°C to +125°C
3-PIN
AS1129N-X AS1129M3-X
AS1129U-X
X= Output Voltage (2.5V, 3.3V or 5.0V)
Consult factory for other fixed voltages.
PIN CONNECTIONS
TO-263-5 (T)
TO-252 (R)
TO-92 (N)
TO-263-3 (T)
SOT-223 (M3)
TO-220-3 (U)
1
2
3
3
VIN
1) OUTPUT
2) SENSE/ ADJ
3) GND
4) SHDN
AS1129
AS1129
AS1129
2
1
GND
VOUT
1
2
3
AS1129
1
3
2
1
2
4
5
3
VOUT
1
2
3
4) V
VIN GND VOUT
GND
VIN
IN
Top View
Front View
Bottom View
VOUT GND VIN
Top View
Top View
VOUT
VIN
GND
VOUT
SHDN
Front View
<0.25V OFF
ON
ON
>2.8V
NC
Rev. 10/11/00