AIC2951/2951D
Low Dropout Linear Regulator
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FEATURES
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DESCRIPTION
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
®
Low Dropout Voltage of 130mV at 100mA Output
Current (AIC2951/2951D-50).
Guaranteed 150mA /300mA Output Current.
Internal 1.3Ω P-MOSFET Draws no Base Current.
Low Ground Current at 55µA.
1% Accuracy Output of 3V/3.3V/5V.
Error Flag Warns of Output Dropout.
1µA Supply Current in Shutdown Mode.
Output Programmable from 1.235V~11V.
Fast Transient Response.
Needs only 1µF for Stability.
Current and Thermal Limiting.
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APPLICATIONS
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Voltage Regulator for Pentium CPUs.
Wireless Communication System.
Battery Powered Systems.
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.
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TYPICAL APPLICATION CIRCUIT
V
OUT
=1.235(1+R1/R2)
R3
390
1
2
R4
33
3
SHDN
4
GND
TAP
ERROR
5
C2
R2
VOUT
SENSE
VIN
FB
8
7
6
C1
+
470
µ
F
V
IN
Q1
D45H2A
V
OUT
R1
+
1000µF
AIC2951
Pentium Processor Power Supply
Analog Integrations Corporation
www.analog.com.tw
DS-2951-01 Mar 13, 00
TEL: 886-3-5772500
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
FAX: 886-3-5772510
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AIC [ ANALOG INTERGRATIONS CORPORATION ]
