®
LP2950/LP2951
100 mA Low Dropout Voltage Regulators
features
s
Guaranteed 100mA Output
Current
s
5.0V and 3.3V Versions @
100mA Output
s
Very Low Quiescent Current
s
Low Dropout Voltage: 380mV
at 100mA
s
Extremely Tight Load and Line
Regulation
s
Very Low Temperature
Coefficient
s
Current & Thermal Limiting
s
Need Only 1µF for Stability
s
LP2951 versions only
• Error Flag Warns of Output
Dropout
• Logic-Controlled Electronic
Shutdown
• Output Programmable From
1.24 to 29V
description
The LP2950 and LP2951 are low power voltage regulators. These
devices are an excellent choice for use in battery-powered applications
such as cordless telephones, radio control systems, and portable com-
puters. The LP2950 and LP2951 feature low quiescent current and
low dropout voltage (typ. 50mV at light load and 380 mV at 100mA).
This includes a tight initial tolerance of 0.5% (typ.), extremely good
load and line regulation (0.05% typ.), and very low output temperature
coefficient, making the LP2950/LP2951 useful as a low-power voltage
reference.
The error flag output feature is used as a power-on reset for warning
of a low output voltage, due to a falling input voltage. The logic-com-
patible shutdown feature enables the regulator to be switched ON and
OFF. The LP2950 is offered in a 3-pin TO-92 package compatible with
other 5V, 3.0V & 3.3V regulators. The LP2951 is available in an 8-lead
SOIC package.
P
typical application circuits
Adjustable Regulator
+V
IN
100K
ERROR
OUTPUT
5
______
ERROR
8
s
Offered in TO-92 (LP2950) &
SOIC (LP2951)
+V
IN
V
OUT
1
1.2 to 30V
LP2951
+
applications
s
s
s
s
s
s
s
s
s
Battery Powered Systems
Cordless Telephones
Radio Control Systems
Portable/Palm Top/Notebook
Computers
Portable Consumer Equipment
Portable Instrumentation
SMPS Post-Regulator
Voltage Reference
Automotive Electronics
SHUTDOWN
INPUT
3
SD
GND
4
R
1
FB
7
3.3uF
.01uF
1.23V
V
REF
R
2
Latch Off When Error Flag Occurs
+V
IN
470kΩ
..
5
8
______
ERROR
+V
IN
1
V
OUT
470kΩ
..
V
OUT
LP2951
+
3
SD
GND
4
R
1
FB
7
1uF
RESET
R
2
2002 Short Form Catalog
P-11
© Copyright 2001 Sipex Corporation
EXAR [ EXAR CORPORATION ]
