®
SPX2954
250mA Low Dropout Voltage Regulator
FEATURES
■
5.0V and 3.3V Versions at 250mA
Output
■
Accurate 0.5% for SPX2954A
■
Very Low Quiescent Current
■
Low Dropout: 310mV at 250mA
■
Extremely Tight Load and Line Regulation
■
Very Low Temperature Coefficient
■
Current and Thermal Limiting
■
Need only 1µF for Stability
■
Direct Replacement for LP2954
■
Offered in TO-92, TO-263, SOT-223,
TO-220 and SOIC
8 Pin Versions Only
■
Error Flag Warns of Output Dropout
■
Logic-Controlled Electronic Shutdown
■
Programmable Output from 1.24V to 30V
+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
+
3.3µF
.01µF
1.23V
V
REF
R
2
Adjustable Regulator
DESCRIPTION
The SPX2954 and SPX2954A 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 computers. The SPX2954 and SPX2954A feature low quiescent current
and low dropout voltage (typ. 20mV at 100µA and 310mV at 250mA). This includes a tight initial
tolerance (0.5% for SPX2954A), extremely good load and line regulation (0.05% typ.), and very
low output temperature coefficient (20 ppm/°C typ.), making the SPX2954/SPX2954A 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-compatible shutdown feature enables the regulator to be
switched ON and OFF. The SPX2954/SPX2954A is offered in 3-pin TO-92, TO-263, SOT-223
and TO-220 packages, and 8 pin SOIC package.
TO-263-3 Package (T)
TO-263-5 Package (T5)
8-Pin Surface Mount (S)
1
2
SPX2954
8
7
6
5
INPUT
FEEDBACK
5V, 3.3V TAP
OUTPUT
TO-92 (N)
1
2
3
SOT-223 Package (M3)
TO-220-3 Package (U) TO-220-5 Package (U5)
OUTPUT
SPX2954
1
2
3
1
SPX2954
SENSE
SPX2954
1
INPUT
GND
2
3
SHUTDOWN
1) INPUT
3
2 3 4 5
2) OUTPUT
GND
3) GND
4
4) SHUTDOWN
5) ERROR
Top View
SPX2954
SPX2954
1) INPUT
2) OUTPUT
ERROR
Bottom View
V
IN
GND
V
OUT
Front View
1 2 3
V
IN
GND V
OUT
1 2 3 4 5
3) GND
4) SHUTDOWN
5) ERROR
V
IN
GND
V
OUT
Top View
Top View
Front View
Front View
Pin Connections
Rev. 3/6/03
SP2954 250mA Low Dropout Voltage Regulator
© Copyright 2003 Sipex Corporation
1
SIPEX [ SIPEX CORPORATION ]
