SPX3940_12 Datasheet, PDF (1/11 Pages) Exar Corporation – 1A Low Dropout Voltage Regulator

February 2012
GENERAL DESCRIPTION
The SPX 3940 is a 1A, accurate voltage
regulator with a low drop out voltage of
280mV (typical) at 1A.
These regulators are specifically designed for
low voltage applications that require a low
dropout voltage and a fast transient respon
se.
They are fully fault protected against over
-
current, reverse battery, and positive and
negative voltage transients.
The SPX 3940 is offered in 3 - pin SOT223 and
TO- 263 packages. For a 3A version, refer to
the SPX29300 data sheet.
SPX3 9 4 0
1 A Low Dr opou t Volt age Regu lat or
Rev. 1.0.0
APPLICATIONS
xPower Supp lies
xLCD Monitors
xPortable Instrumentation
xMedical and Industrial Equipments
FEATURES
xGuaranteed 1.5A Peak Current
x1% Output Accuracy SPX3940A
xLow Quiescent Current
xLow Dropout Voltage of 280mV at 1A
xExtremely Tight Load and Line
Regulation
xExtremely Fast Transient Response
xReverse - battery Protection
xInternal Thermal Protection
xInternal Short Circuit Current Limit
xReplacement for LM 3 940
xStandard SOT223 & TO - 263 packages
TYPICAL APPLICATION DIAGRAM
Fig. 1: SPX3940 Application Diagram ±Fixed Output Linear Regulator
Exar Corporation
48720 Kato Road, Fremont CA 94538
, USA
www.exar.com
Tel. [phone] - 70 00 ±Fax. [phone] - 70 01