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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AIC2951/2951D
Low Dropout Linear Regulator
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ORDERING INFORMATION
AIC2951 X-XXXX
PACKAGE TYPE
N: PLASTIC DIP
S: SMALL OUTLINE
TEMPERATURE RANGE
C: 0
°
C~+70
°
C
OUTPUT VOLTAGE
30 : 3.0V
33 : 3.3V
50 : 5.0V
MAX. OUTPUT CURRENT
DEFAULT
: 150mA
D : 300mA
ORDER NUMBER
AIC2951-30CN
AIC2951-33CN
AIC2951-50CN
AIC2951D-30CN
AIC2951D-33CN
AIC2951D-50CN
(PLASTIC DIP)
AIC2951-30CS
AIC2951-33CS
AIC2951-50CS
AIC2951D-30CS
AIC2951D-33CS
AIC2951D-50CS
(PLASTIC SO)
PIN CONFIGURATION
TOP VIEW
VOUT
SENSE
SHDN
GND
1
2
3
4
8
7
6
5
VIN
FB
TAP
ERROR
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ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage
........................… … … … … ............................................... -0.3~12V
Feedback Input Voltage..................................…
… … … … .................................. -0.3~12V
Shutdown Input Voltage
................................… … … … … .................................. -0.3~12V
Error Comparator Output
......................................… … … … .............................. -0.3~12V
Operating Junction Temperature Range
.............… … … … ..........................
-40°C~125
°C
Storage Temperature Range
............................… … … … ............................
-65°C~150
°C
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TEST CIRCUIT
V
OUT
+
C
OUT
10
µ
F
VOUT
SENSE
SHDN
GND
VIN
V
REF
FB
TAP
1mA
ERROR
+
C
IN
1
µ
F
V
IN
SHUTDOWN
AIC2951
2
AIC2951/2951D
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TYPICAL PERFORMANCE CHARACTERISTICS
Reference Voltage vs Temperature
1.28
60
Ground Current vs. Input Voltage
Reference Voltage (V)
1.26
50
1.24
V
REF
=1.244V
V
REF
=1.235V
V
REF
=1.225V
Ground Current (µA)
125
40
30
1.22
20
1.2
10
1.18
-50
-25
0
25
50
75
100
0
0
1
2
3
4
5
6
7
8
Temperature(
°
C)
Input Voltage (V)
Ground Current vs. Temperature
60
600
Dropout Voltage vs Load Current
500
58
Dropout Voltage (mV)
Ground Current (µA)
V
OUT
=3V
400
56
I
L
=300mA
I
L
=150mA
V
OUT
=3.3V
300
54
V
OUT
=5V
200
52
I
L
=0.1mA
100
50
-50
-25
0
0
Temperature(
°
C)
25
50
75
100
125
0
50
100
150
200
250
300
Load Current (mA)
Dropout Voltage vs Temperature
600
500
Short Circuit Current vs. Temperature
Dropout Voltage(mV)
I
L
=300mA
400
Short Circuit Current (mA)
500
V
OUT
=5V
AIC2951D
400
300
I
L
=150mA
200
300
100
AIC2951
I
L
=0.1mA
0
-50
-25
0
25
50
75
100
125
200
-50
-25
0
Temperature(
°
C)
Temperature (
°
C)
25
50
75
100
125
5
Analogue and Mixed Signal
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