SPX2957AS Просмотр технического описания (PDF) - Signal Processing Technologies
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SPX2957AS Datasheet PDF : 9 Pages
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FEATURES
• Output Accuracy 5V, 3.3V@ 350mA Output
• Very Low Quiescent Current
• Low Dropout Voltage
• 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 29V
SPX2955/56/57
350mA Low Drop Out Voltage Regulator
with Shutdown
(PRELIMINARY INFORMATION)
APPLICATIONS
• Battery Powered Systems
• Cordless Telephones
• Radio Control Systems
• Portable/Palm Top/Notebook Computers
• Portable Consumer Equipment
• Portable Instrumentation
• Automotive Electronics
• SMPS Post-Regulator
• 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
(100µA 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.
TO-263-5 Package
SPX2956/57
12 345
Top View
Five Lead Package Pin Functions:
SPX2956
SPX2957
1) ERROR
ADJUST
2) INPUT
SHUTDOWN
3) GND
GND
4) OUTPUT
INPUT
5) SHUTDOWN OUTPUT
PIN CONNECTIONS
TO-220-5 Package
SPX2956/57
8-Pin Surface Mount
OUTPUT
SENSE
SHUTDOWN
GROUND
1
8
2 ALPHA 7
3 SAPSX229935056
4
5
INPUT
FEEDBACK
5V/ 3.3V TAP
ERROR
Top View
1 2 345
Top View
TO-220-3 Package
3
2
1
Front View
VOUT
GND
VIN
TO-263-3 Package
SPX2955
Front View
3 VOUT
2 GND
1 V IN
Rev. 11/21/00
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