MP1482 2A, 18V Synchronous Rectified Step-Down Converter The Future of Analog IC Technology FEATURES DESCRIPTION 2A Output Current The MP1482 is a monolithic synchronous buck Wide 4.75V to 18V Operating Input Range regulator. The device integrates two 130m Integrated 130m Power MOSFET Switches MOSFETs, and provides 2A of continuous load Output Adjustable from 0.923V to 15V current over a wide input voltage of 4.75V to Up to 93% Efficiency 18V. Current mode control provides fast Programmable Soft-Start transient response and cycle-by-cycle current Stable with Low ESR Ceramic Output Capacitors limit. Fixed 340kHz Frequency An adjustable soft-start prevents inrush current Cycle-by-Cycle Over Current Protection at turn-on, and in shutdown mode the supply Input Under Voltage Lockout current drops to 1A. 8Pin SOIC This device, available in an 8-pin SOIC APPLICATIONS package, provides a very compact solution with minimal external components. Distributed Power Systems Networking Systems FPGA, DSP, ASIC Power Supplies Green Electronics/ Appliances Notebook Computers All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Products, Quality Assurance page. MPS and The Future of Analog IC Technology are registered trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION Efficiency vs INPUT Load Current 100 95 V = 3.3V OUT 2 1 90 IN BS 7 3 85 V = 2.5V EN SW OUT 80 MP1482 5 8 75 SS FB GND COMP 70 4 6 65 60 55 50 0 0.5 1.0 1.5 2.0 2.5 LOAD CURRENT (A) MP1482 Rev. 1.31 www.MonolithicPower.com 1 7/9/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2012 MPS. All Rights Reserved. NOT RECOMMENDED FOR NEW DESIGNS REFER TO MP1476 EFFICIENCY (%)MP1482 2A, 18V SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER ORDERING INFORMATION Part Number Package Top Marking Free Air Temperature (T ) A MP1482DS* SOIC8 MP1482DS -40 C to +85C * For Tape & Reel, add suffix Z (e.g. MP1482DSZ) For RoHS Compliant Packaging, add suffix LF (e.g. MP1482DSLFZ) PACKAGE REFERENCE TOP VIEW BS 1 8 SS IN 2 7 EN SW 3 6 COMP GND 4 5 FB SOIC8 (1) (4) ABSOLUTE MAXIMUM RATINGS Thermal Resistance JA JC Supply Voltage V ........................-0.3V to +20V IN SOIC8..................................... 90...... 45... C/W Switch Node Voltage V ............................ 21V SW Notes: Boost Voltage V ..........V 0.3V to V + 6V BS SW SW 1) Exceeding these ratings may damage the device All Other Pins..................................-0.3V to +6V 2) The maximum allowable power dissipation is a function of the maximum junction temperature T(MAX), the junction-to- Junction Temperature...............................150C J (2) ambient thermal resistance , and the ambient temperature JA Continuous Power Dissipation (T = +25C) A T . The maximum allowable continuous power dissipation at A SOIC8.1.38W any ambient temperature is calculated by P (MAX)=(T (MAX)-T )/ . Exceeding the maximum D J A JA Lead Temperature ....................................260C allowable power dissipation will cause excessive die Storage Temperature .............. -65C to +150C temperature, and the regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device from (3) Recommended Operating Conditions permanent damage.. 3) The device is not guaranteed to function outside of its Input Voltage V ............................4.75V to 18V IN operating conditions. Output Voltage V .....................0.923V to 15V OUT 4) Measured on JESD51-7, 4-layer board. Operating Junct. Temp (T )........-40C to +125C J MP1482 Rev. 1.31 www.MonolithicPower.com 2 7/9/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2012 MPS. All Rights Reserved. NOT RECOMMENDED FOR NEW DESIGNS REFER TO MP1476