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SPX2947U5 Datasheet

  • SPX2947U5

  • 500mA Low Drop Out Voltage Regulator with Shutdown

  • 11頁

  • SIPEX

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廬
SPX2945
400mA Low Dropout Voltage Regulator with Shutdown
FEATURES
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Output 3.3V, 5.0V at 400mA Output
鈻?/div>
Very Low Quiescent Current, 100碌A
鈻?/div>
Low Dropout Voltage, 420mV at 400mA
鈻?/div>
Extremely Tight Load and Line Regulation
鈻?/div>
Very Low Temperature Coefficient
鈻?/div>
Current & Thermal Limiting
鈻?/div>
Error Flag Warns Of Output Dropout
鈻?/div>
Logic-Controlled Electronic Shutdown
鈻?/div>
Output Programmable From 1.24V to 20V
(for SO-8)
V
IN
IN
OUT
ON
SHUTDOWN
INPUT
OFF
+V
IN
100K
8
+V
IN
V
OUT
+
7
R
1
0.01碌F
10碌F
1
1.2V to 20V
SPX2945
3
SD
GND
4
FB
______
ERROR
ERROR
5
R
2
V
REF
OUTPUT
Adjustable Regulator
5V
SPX2945
+
0.1
碌F
GND
+
2.2
碌F
5V Regulator Circuit
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 (100碌A 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
Rev. B Date:01/20/04
SPX2945 400mA Low Dropout Voltage Regulator with Shutdown
GND
V
OUT
V
IN
SD
Er
漏Copyright 2004 Sipex Corporation
1

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