LM3940 Datasheet | Texas Instruments

Features - 1 Input Voltage Range: 4.5 V to 5.5 V - Output Voltage Specified over Temperature - Excellent Load Regulation - Specified 1-A Output Current - Requires only One External ponent - Built-in Protection against Excess Temperature - Short-Circuit Protected 2 Applications - Laptop and Desktop puters - Logic Systems 3 Description The LM3940 is a 1-A low-dropout regulator designed to provide 3.3 V from a 5-V supply. The LM3940 is ideally suited for systems which contain both 5-V and 3.3-V logic, with prime power provided from a 5-V bus. Because the LM3940 is a true low dropout regulator, it can hold its 3.3-V output in regulation with input voltages as low as 4.5 V. The TO-220 package of the LM3940 means that in most applications the full 1 A of load current can be delivered without using an additional heatsink. The surface mount DDPAK/TO-263 package uses minimum board space, and gives excellent power dissipation capability when soldered to a copper plane on the PC board. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) SOT-223 (4) 6.50 mm x 3.50 mm DDPAK/TO-263 (3) 10.18 mm x 8.41 mm TO-220 (3) 14.986 mm x 10.16 mm (1) For all available packages, see the orderable addendum at the end of the datasheet. Simplified Schematic - Required if regulator is located more than 1 inch from the power supply filter capacitor or if battery power is used. - - See Application and Implementation. An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. SNVS114G - MAY 1999 - REVISED FEBRUARY 2015 .ti. Table of Contents 1 Features 1 2 Applications 1 3 Description 1 4 Revision History...