SPX2945M3 Просмотр технического описания (PDF) - Signal Processing Technologies
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SPX2945M3 Datasheet PDF : 15 Pages
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FEATURES
• Output Accuracy 3.3V, 5.0V, @ 500mA 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
SPX2945/46/47
500mA 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 SPX2945/46/47 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 SPX2945/46/47 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 SPX2945/46/47 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 SPX2945/46/47 is
offered in 3-pin and 5-pin TO-220 package, SO-8 (same pin out as SPX2951), SOT-223, and surface mount TO-263 packages.
The regulator output voltage (of the 8-pin SO-8 and 5-pin TO-220 & TO-263) may be pin-strapped for a 3.3V and 5.0V or
programmed from 1.24V to 29V with an external pair of resistors. Look for SPX2951 for 150mA, SPX2954 for 250mA and SPX2955
for 350mA applications.
PIN CONNECTIONS
TO-263-5 (T)
SPX2946/47
12 345
Five Lead Package Pin Functions:
SPX2946
1) ERROR
SPX2947
1) ERROR
2) VIN
3) GND
2) SHUTDOWN
3) GND
4) VOUT
4) VIN
5) SHUTDOWN 5) VOUT
TO-220-5 (U)
SPX2946/47
1 2 3 45
TO-220-3 (U)
SPX2945
123
Top View
Front View
VIN GND VOUT
Front View
TO-263-3 (T)
SPX2945
1 23
VIN GND VOUT
Top View
TO-252 (R)
SPX2945
1 23
VIN GND VOUT
8-Pin Surface Mount (S)
SOT-223 (M3)
VOUT
SENSE
SHUTDOWN
GND
1
8
2
7
SPX2945
3
6
4
5
VIN
FEEDBACK
5V/ 3.3V TAP
ERROR
SPX2945
1 23
VIN GND VOUT
Top View
Top View
Top View
Rev. 10/25/00
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