[Bay-Linear]

Description

The Bay Linear LM3940 is a 1.25A high accuracy, low dropout voltage regulator with only 40mV at light loads and 350mV(Typ.)@ 1.0A) and low quiescent current of 240µA typical.

The LM3940 is designed for low voltage a application that requires lower dropout voltage and faster transient response. This device is an excellent choice for use in powering low voltage applications where require a lower dropout, faster transient response to regulate from +2.5V to 3.8V supplies and as a post regulator for switching supplies applications.

The LM3940 offers full protection against over-current faults, reversed input polarity, reversed load insertion, and positive and negative transient voltage. On-Chip trimming adjusts the reference voltage to 1.

The LM3940 are offered in a 3-pin SOT-223, TO-220 & TO-263 package compatible with other 3 terminal regulators. The LM3940 is also offer in a new LPDD (Low Profile TO-263) package from 4.47 mm (DD) tickness down to only 1.27 mm (LPDD) total tickness.

Features

• High output accuracy of 1

• Fix Output 5.0v & 3.3V

• Output Current of 1.25A

• Low Dropout Voltage

• Low quiescent current

• Extremely Tight Load & Line Regulation

• Reverse-battery and “Load Dump” Protection

• Zero Current Shutdown Mode (5-pin version)

• Offer in TO-263, TO-252, TO-220, SOT-223, & New Slim LPDD

• Similar to industry Standard LM3940

Applications

• Powering VGA & Sound Card

• LCD Monitor

• Battery Powered Equipments/Laptop & Notebook

• SMPS Post Regulator / DC to DC Modules

• High Efficiency Linear Power Supply

• Adjustable Power Supply

• Bar Code Scanners