LM1085 Datasheet | National Semiconductor

Description The LM1085 is a series of low dropout positive voltage regulators with a maximum dropout of 1.5V at 3A of load current. It has the same pin-out as National Semiconductor’s industry standard LM317. The LM1085 is available in an adjustable version, which can set the output voltage with only two external resistors. It is also available in three fixed voltages: 3.3V, 5.0V and 12.0V. The fixed versions integrate the adjust resistors. The LM1085 circuit includes a zener trimmed bandgap reference, current limiting and thermal shutdown. The LM1085 series is available in TO-220 and TO-263 packages. Refer to the LM1084 for the 5A version, and the LM1086 for the 1.5V version. Features n Available in 3.3V, 5.0V, 12V and Adjustable Versions n Current Limiting and Thermal Protection n Output Current 3A n Line Regulation 0.015% (typical) n Load Regulation 0.1% (typical) Applications n High Efficiency Linear Regulators n Battery Charger n Post Regulation for Switching Supplies n Constant Current Regulator n Microprocessor Supply Connection Diagrams TO-220 TO-263 Top View DS100947-2 Basic Functional Diagram, Adjustable Version DS100947-4 Top View Application Circuit DS100947-65 DS100947-52 1.2V to 15V Adjustable Regulator © 2001 National Semiconductor Corporation DS100947 .national. Ordering Information Package 3-lead TO-263 Temperature Range - 40˚C to +125˚C 3-lead TO-220 - 40˚C to + 125˚C Simplified Schematic Part Number LM1085IS-ADJ LM1085ISX-ADJ LM1085IS-12 LM1085ISX-12 LM1085IS-3.3 LM1085ISX-3.3 LM1085IS-5.0 LM1085ISX-5.0 LM1085IT-ADJ LM1085IT-12 LM1085IT-3.3 LM1085IT-5.0 Transport Media Rails Tape and Reel Rails Tape and Reel Rails Tape and Reel Rails Tape and Reel Rails Rails Rails Rails NSC Drawing TS3B T03B .national....