SPX3942T Просмотр технического описания (PDF) - Signal Processing Technologies
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SPX3942T Datasheet PDF : 7 Pages
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FEATURES
• Output Accuracy 3.3V, @ 1A 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
SPX3940/41/42
1A 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 SPX3940/41/42 is a low power voltage regulator. This device is an excellent choice for battery-powered applications such as
cordless telephones, radio control systems and portable computers. The SPX3940/41/42 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 SPX3940/41/42 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 SPX3940/41/42 is
offered in 3-pin and 5-pin TO-220 package 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 or programmed from
1.24V to 29V with an external pair of resistors.
TO-263-5 Package
SPX3941/42
12 345
Top View
Five Lead Package Pin Functions:
SPX3941 SPX3942
1) ERROR
ADJUST
2) INPUT
SHUTDOWN
3) GND
GND
4) OUTPUT
INPUT
5) SHUTDOWN OUTPUT
PIN CONNECTIONS
TO-220-5 Package
SOT-223 Package
SPX3941/42
12 345
Top View
SPX3940
1
2
3
V GND/ V
IN ADJ
OUT
Front View
TO-252 Package
3
2
1
Front View
VOUT
ADJ/GND
VIN
TO-220 Package
SPX3940
Front View
VOUT
GND/ ADJ
VIN
TO-263Package
3 VOUT
2 GND/ ADJ
Front View
1 V IN
Rev. 12/19/00
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