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SPX2957U5 Datasheet

  • SPX2957U5

  • 350mA Low Drop Out Voltage Regulator with Shutdown

  • 9頁

  • SIPEX

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SPX2955/56/57
350mA Low Drop Out Voltage Regulator
with Shutdown
(PRELIMINARY INFORMATION)
FEATURES
鈥?/div>
Output Accuracy 5V, 3.3V@ 350mA Output
鈥?/div>
Very Low Quiescent Current
鈥?/div>
Low Dropout Voltage
鈥?/div>
Extremely Tight Load And Line Regulation
鈥?/div>
Very Low Temperature Coefficient
鈥?/div>
Current & Thermal Limiting
鈥?/div>
Error Flag Warns Of Output Dropout
鈥?/div>
Logic-Controlled Electronic Shutdown
鈥?/div>
Output Programmable From 1.24V to 29V
APPLICATIONS
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Battery Powered Systems
鈥?/div>
Cordless Telephones
鈥?/div>
Radio Control Systems
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Portable/Palm Top/Notebook Computers
鈥?/div>
Portable Consumer Equipment
鈥?/div>
Portable Instrumentation
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Automotive Electronics
鈥?/div>
SMPS Post-Regulator
鈥?/div>
Voltage Reference
PRODUCT DESCRIPTION
The SPX2955/56/57 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 SPX2955/56/57 features very low quiescent current
(100碌A Typ.) and very low dropout voltage. This includes a tight initial tolerance of 1% max and 2% max., and very low output
temperature coefficient, making the SPX2955/56/57 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 SPX2955/56/57 is
offered in 3-pin and 5-pin TO-220 package compatible with other 5 volt and adjustable regulators, in 8-Pin Plastic Dip SO-8 (same pin
out as SPX2951) and surface mount TO-263 packages.
The regulator output voltage (of the 8-pin package and 5-pin TO-220 & TO-263) may be pin-strapped for a 5V and 3.3V or
programmed from 1.24V to 29V with an external pair of resistors. Look for SPX2951 for 150mA and SPX2954 for 250mA
applications.
PIN CONNECTIONS
TO-220-3 Package
TO-263-5 Package
TO-220-5 Package
8-Pin Surface Mount
OUTPUT
1
2
SPX2955
3
2
1
V
OUT
GND
V
IN
8
INPUT
FEEDBACK
5V/ 3.3V TAP
ERROR
SPX2956/57
SENSE
Five Lead Package Pin Functions:
SPX2956
SPX2957
1)
ERROR
2)
INPUT
3)
GND
4)
OUTPUT
5)
SHUTDOWN
ADJUST
SHUTDOWN
GND
INPUT
OUTPUT
SPX2956/57
SHUTDOWN
GROUND
ALPHA
7
SPX2955
3
AS2930
6
4
5
Front View
TO-263-3 Package
Top View
1 2 34 5
3 V
OUT
1 2 3 4 5
SPX2955
Top View
2 GND
1 V
IN
Top View
Front View
Rev. 11/21/00

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