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SPX2945T5-3-3 Datasheet(PDF) 1 Page - Sipex Corporation

Part # SPX2945T5-3-3
Description  400mA Low Dropout Voltage Regulator with Shutdown
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SPX2945T5-3-3 Datasheet(HTML) 1 Page - Sipex Corporation

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Date: 3/14/06
SPX2945 400mA Low Dropout Voltage Regulator with Shutdown
©Copyright 2006 Sipex Corporation
SPX2945
DESCRIPTION
FEATURES
■ Output 3.3V, 5.0V at 400mA Output
■ Very Low Quiescent Current, 100µA
■ Low Dropout Voltage, 420mV at 400mA
■ Extremely Tight Load and Line Regulation
■ Very Low Temperature Coefficient
■ Current & Thermal Limiting
■ Error Flag Warns Of Output Dropout
■ Logic-Controlled Electronic Shutdown
■ Output Programmable From 1.24V to 20V
(for SO-8)
The SPX2945 is a low power voltage regulator. This device is an excellent choice for use in battery-powered
applications such as cordless telephones, radio control systems, and portable computers. The SPX2945
features very low quiescent current (100µA Typ.) and very low dropout voltage. This includes a tight initial
tolerance of 1% max and very low output temperature coefficient, making the SPX2945 useful as a low-
power voltage reference.
The error flag output feature is used as power-on reset for warning of a low output voltage, due to a falling
voltage input of batteries. Another feature is the logic-compatible shutdown input which enables the
regulator to be switched on and off. The SPX2945 is offered in 3-pin TO-220 package, SO-8 (same pin
out as SPX2951), SOT-223, surface mount 3-Pin TO-252, 3-Pin TO-263 packages and 5-Pin TO-263.
The regulator output voltage (of the 8-pin SO-8) may be pin-strapped for a 3.3V and 5.0V or programmed
from 1.24V to 20V with an external pair of resistors. Look for SPX2951 for 150mA and SPX2954 for 250mA
applications.
400mA Low Dropout Voltage Regulator with Shutdown
TO-220-3 (U)
123
V
IN
V
OU
GN
SPX2945
13
25
4
SPX2945
5 Pin TO-263
13
2
SOT-223 (M3)
V
IN
GN
V
OU
SPX2945
2
1
3
4
8
7
6
5
8-Pin Surface Mount
V
OU
SENS
SHUTDOWN
GN
V
IN
FEEDBACK
5V/ 3.3V TAP
ERRO
SPX2945
TO-252 (R)
1
23
V
IN
V
OU
GN
SPX2945
TO-263-5
V
IN
TO-263-3 (T)
V
OU
GN
SPX2945
3
2
1
(S)
(T5)
100K
ERROR
______
SD
V
OUT
GND
FB
+V
IN
0.01µF
3
8
1
4
7
SHUTDOWN
INPUT
SPX2945
OFF
ON
+V
IN
5
10µF
V
REF
R
2
R
1
+
ERROR
OUTPUT
1.2V to 20V
+
2.2 µF
+
SPX2945
V
IN
5V
IN
GND
OUT
0.1 µF
Adjustable Regulator
5V Regulator Circuit
Now Available in Lead Free Packaging
Note: Tab is Ground


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