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SPX2945_06

Description
400mA Low Dropout Voltage Regulator with Shutdown
File Size228KB,12 Pages
ManufacturerSIPEX
Websitehttp://www.sipex.com/
Download Datasheet View All

SPX2945_06 Overview

400mA Low Dropout Voltage Regulator with Shutdown

SPX2945
400mA Low Dropout Voltage Regulator with Shutdown
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)
0.1
µF
ON
SHUTDOWN
INPUT
OFF
+V
IN
100K
8
+V
IN
1
V
OUT
1.2V to 20V
+
SPX2945
3
SD
GND
4
FB
7
R
1
0.01µF
10µF
______
ERROR
ERROR
5
R
2
V
REF
OUTPUT
Adjustable Regulator
V
IN
5V
IN
OUT
SPX2945
+
GND
+
2.2
µF
5V Regulator Circuit
Now Available in Lead Free Packaging
DESCRIPTION
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.
TO-220-3 (U)
TO-263-3 (T)
TO-263-5 (T5)
TO-252 (R)
V
OU
8-Pin Surface Mount
(S)
SOT-223 (M3)
SPX2945
SPX2945
1
1
2
3
2
3
1
2
3
4
8
7
6
5
SPX2945
5 Pin TO-263
SPX2945
1
2
3
SPX2945
SENS
SHUTDOWN
V
IN
FEEDBACK
5V/ 3.3V TAP
ERRO
SPX2945
1
2
3
1 2 3 4 5
V
IN
GN
V
IN
GN
V
OU
V
OU
GN
V
IN
GN
V
OU
V
IN
GN
V
OU
Note: Tab is Ground
Date: 3/14/06
SPX2945 400mA Low Dropout Voltage Regulator with Shutdown
©Copyright 2006 Sipex Corporation
GND
V
OUT
V
IN
SD
Er
1
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