AIC2951 Datasheet, PDF (1/10 Pages) Analog Intergrations Corporation – Low Dropout Linear Regulator

AIC2951/2951D
Low Dropout Linear Regulator
n FEATURES
n DESCRIPTION
l Low Dropout Voltage of 130mV at 100mA Output
Current (AIC2951/2951D-50).
l Guaranteed 150mA /300mA Output Current.
l Internal 1.3Ω P-MOSFET Draws no Base Current.
l Low Ground Current at 55µA.
l 1% Accuracy Output of 3V/3.3V/5V.
l Error Flag Warns of Output Dropout.
l 1µA Supply Current in Shutdown Mode.
l Output Programmable from 1.235V~11V.
l Fast Transient Response.
l Needs only 1µF for Stability.
l Current and Thermal Limiting.
n APPLICATIONS
l Voltage Regulator for Pentium^® CPUs.
l Wireless Communication System.
l Battery Powered Systems.
The AIC2951/ 2951D series is the enhanced
CMOS version of the LP2951. The superior char-
acteristics of the AIC2951/ 2951D series include
zero base current loss, very low dropout voltage,
and 1% accuracy output voltage. Typical ground
current remains approximately 55µA, from no
load to maximum loading conditions. Dropout
voltage at 100mA output current is significantly
lower than its bipolar counterpart: 130mV for the
AIC2951-50/2951D-50, 180mV for the AIC2951-
33/ 2951D-33, and 200mV for the AIC2951-30/
2951D-30. Output current limiting and thermal
limiting are built in to provide maximal protection
to the AIC2951/2951D series from fault condi-
tions.
An error flag output, indicating when output volt-
age drops out of regulation, often due to the
falling batteries on the input, can be used for a
power-on reset. A logic-controlled shutdown
input enables the regulator to be switched on and
off. The part may be configured for a fixed output
voltage or programmed from 1.235V to 11V with
an external pair of resistors. The part comes in 8-
pin DIP or SO packages.
n TYPICAL APPLICATION CIRCUIT
VOUT=1.235(1+R1/R2)
1
VOUT
8
VIN
2
R4
SENSE
7
FB
33
3
SHDN
6
TAP
4
5
GND ERROR
AIC2951
R3
C1
+
470µF
VIN
390
Q1
D45H2A
VOUT
R1
C2
R2
+
1000µF
Pentium Processor Power Supply
Analog Integrations Corporation
www.analog.com.tw
DS-2951-01 Mar 13, 00
TEL: [phone]
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
FAX: [phone]
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