®
SPX2954
250mA Low Dropout Voltage Regulators
features
s
Guaranteed 250mA Output
Current
s
5.0V and 3.3V Versions at
250mA Output
s
Very Low Quiescent Current
s
Low Dropout Voltage: 375mV
at 250mA
s
Extremely Tight Load and Line
Regulation
s
0.5% and 1% Accuracy
s
Very Low Temperature
Coefficient
s
Current and Thermal Limiting
s
Error Flag and Enable
s
Reverse Battery and
Overvoltage Transient
Protection
s
TO-92, 8L SOIC Package
Options
s
Direct Replacement For
LP2954
description
The SPX2954 is a low power voltage regulator. This device is an
excellent choice for use in battery-powered applications such as cord-
less telephones, radio control systems, and portable computers. The
SPX2954 has a low quiescent current and low dropout voltage (typ.
375 mV at 250mA). 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 it 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 SPX2954 is offered in a variety of industry standard pack-
ages and is compatible with other 3.3V AND 5.0V regulators.
P
typical application circuits
Adjustable Regulator
+V
IN
100K
ERROR
OUTPUT
5
8
______
ERROR
+V
IN
V
OUT
1
1.2 to 30V
SPX2954
+
SHUTDOWN
INPUT
3
SD
GND
4
R
1
FB
7
3.3uF
.01uF
applications
s
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
Avionics
SMPS Post-Regulator
Voltage Reference
Automotive Electronics
P-159
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
SPX2954
+
3
SD
GND
4
R
1
FB
7
1uF
RESET
R
2
2002 Short Form Catalog
© Copyright 2001 Sipex Corporation
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