MP8718EN-LF Monolithic Power Systems

MP8718 High Efficiency 4A, 21V, 500kHz Synchronous Step-down Converter The Future of Analog IC Technology DESCRIPTION FEATURES The MP8718 is a high frequency synchronous Wide 4.5V to 21V Operating Input Range rectified step-down switch mode converter with 4A Output Current built in internal power MOSFETs. It offers a Low Rds(on) Internal Power MOSFETs very compact solution to achieve 4A continuous Proprietary Switching Loss Reduction output current over a wide input supply range Technique with excellent load and line regulation. The High Efficiency Synchronous Mode Operation MP8718 has synchronous mode operation for Fixed 500kHz Switching Frequency higher efficiency over output current load range. Sync from 300kHz to 2MHz External Clock Current mode operation provides fast transient 1.5ms Internal Soft-Start response and eases loop stabilization. Internal Compensation OCP Protection and Hiccup Full protection features include OCP and Thermal Shutdown thermal shut down. Output Adjustable from 0.8V The MP8718 requires a minimum number of Available in a Thermally Enhanced 8-pin SOIC readily available standard external components package and is available in a space saving 8-pin SOIC APPLICATIONS package with an exposed pad. Notebook Systems and I/O Power Networking Systems Digital Set Top Boxes Personal Video Recorders Flat Panel Television and Monitors Distributed Power Systems MPS and The Future of Analog IC Technology are Registered Trademarks of Monolithic Power Systems, Inc. The information in this datasheet about the product and its associated technologies are proprietary and intellectual property of Monolithic Power Systems and are protected by copyright and pending patent applications TYPICAL APPLICATION Efficiency V =1.2V OUT 100 21 V =5V 1 4 IN VIN IN BST 90 80 70 V =21V IN 2,3 SW VOUT 1.2V 60 V =12V 7 IN MP8718 VCC R1 50 4.99k 40 6 FB Rt 30 47k 5 R2 ON/OFF EN/SYNC 10k 20 GND 10 8 0 0 12 3 4 OUTPUT CURRENT (A) MP8718 Rev. 0.9 www.MonolithicPower.com 1 4/12/2016 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. 2016 MPS. All Rights Reserved. EFFICIENCY (%)MP8718 SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS ORDERING INFORMATION Part Number* Package Top Marking Free Air Temperature (T ) A MP8718EN SOIC8E MP8718EN -20 C to +85C * For Tape & Reel, add suffix Z (e.g. MP8718ENZ) For RoHS compliant packaging, add suffix LF (e.g. MP8718ENLFZ) PACKAGE REFERENCE TOP VIEW IN 1 8 GND SW 2 7 VCC SW 3 6 FB BST 4 5 EN/SYNC EXPOSED PAD ON BACKSIDE CONNECT TO GND (4) (1) Thermal Resistance JA JC ABSOLUTE MAXIMUM RATINGS SOIC8E (Exposed Pad) ..........50 ...... 10... C/W Supply Voltage V ....................................... 22V IN V ........................-0.3V (-5V for < 10ns) to 23V SW Notes: V ....................................................... V + 6V 1) Exceeding these ratings may damage the device. BS SW 2) The maximum allowable power dissipation is a function of the All Other Pins..................................-0.3V to +6V maximum junction temperature T(MAX), the junction-to- J Operating Temperature.............. -20C to +85 C ambient thermal resistance , and the ambient temperature JA (2) T . The maximum allowable continuous power dissipation at A Continuous Power Dissipation (T = +25C) A any ambient temperature is calculated by P (MAX)=(T (MAX)- D J ....2.5W T )/ . Exceeding the maximum allowable power dissipation A JA will cause excessive die temperature, and the regulator will go Junction Temperature...............................150C into thermal shutdown. Internal thermal shutdown circuitry Lead Temperature ....................................260C protects the device from permanent damage. 3) The device is not guaranteed to function outside of its Storage Temperature............... -65C to +150 C operating conditions. 4) Measured on JESD51-7, 4-layer PCB. (3) Recommended Operating Conditions Supply Voltage V ...........................4.5V to 21V IN Operating Junct. Temp (T )...... -20 C to +125 C J MP8718 Rev. 0.9 www.MonolithicPower.com 2 4/12/2016 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. 2016 MPS. All Rights Reserved.