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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 (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 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.
PIN CONNECTIONS
TO-263-5 Package
TO-220-5 Package
SOT-223 Package
TO-220 Package
V
OUT
SPX3941/42
Five Lead Package Pin Functions:
SPX3941
SPX3942
1)
ERROR
2)
INPUT
3)
GND
1 2 3 4 5
4)
OUTPUT
5)
SHUTDOWN
ADJUST
SHUTDOWN
GND
INPUT
OUTPUT
SPX3940
SPX3941/42
1
2
3
SPX3940
GND/ ADJ
V
IN
V
GND/
V
OUT
IN
ADJ
Front View
Front View
TO-252 Package
TO-263Package
1 2 3 4 5
SPX3940
2
1
Top View
ADJ/GND
V
IN
SPX3940
Top View
3
V
OUT
3 V
OUT
2
GND/ ADJ
1 V
IN
Front View
Front View
Rev. 12/19/00
1
2
3
4
5
6
7
