SPX3940T-L-3-3/TR

SPX3940 1A Low Dropout Voltage Regulator February 2012 Rev. 1.0.0 GENERAL DESCRIPTION The SPX3940 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 response. They are fully fault protected against overcurrent, reverse battery, and positive and negative voltage transients. The SPX3940 is offered in 3-pin SOT223 and TO-263 packages. For a 3A version, refer to the SPX29300 data sheet. APPLICATIONS  Power Supplies  LCD Monitors  Portable Instrumentation  Medical and Industrial Equipments FEATURES  Guaranteed 1.5A Peak Current  1% Output Accuracy SPX3940A  Low Quiescent Current  Low Dropout Voltage of 280mV at 1A  Extremely Tight Load and Line Regulation  Extremely Fast Transient Response  Reverse-battery Protection  Internal Thermal Protection  Internal Short Circuit Current Limit  Replacement for LM3940  Standard 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. +1 510 668-7000 – Fax. +1 510 668-7001 SPX3940 1A Low Dropout Voltage Regulator ABSOLUTE MAXIMUM RATINGS OPERATING RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. Input Voltage VIN .................................................... 16V Junction Temperature Range ....................-40°C to 125°C Packages Thermal Resistance SOT-223 Junction to Case (at TA) ..................... 15°C/W SOT-223 Junction to Ambient ........................62.3°C/W TO-263 Junction to Case (at TA) ......................... 3°C/W TO-263 Junction to Ambient ..........................31.4°C/W Input Voltage VIN ................................................... 20V1 Storage Temperature .............................. -65°C to 150°C Lead Temperature (Soldering, 5 sec) ..................... 260°C Note 1: Maximum positive supply voltage of 20V must be of limited duration (