MP8642 Dual 3A, 23V, 600kHz Step-Down Converter with Frequency Synchronization The Future of Analog IC Technology DESCRIPTION FEATURES The MP8642 is a dual monolithic step-down 3A Current for Each Output switch mode converter with built-in internal 80m Internal Power MOSFET Switch power MOSFETs. It achieves 3A continuous Stable with Low ESR Output Ceramic output current for each output over a wide input Capacitors supply range with excellent load and line Up to 95% Efficiency regulation. Power Good Indicator Fixed 600kHz Frequency Current mode operation provides fast transient Synchronizable to >1MHz External Clock response and eases loop stabilization. Thermal Shutdown Fault condition protection includes cycle-by-cycle Cycle-by-Cycle Over Current Protection current limiting and thermal shutdown. Wide 4.5V to 23V Operating Input Range The MP8642 requires a minimum number of Each Output Adjustable from 0.8V to 20V readily available standard external components. Available in a 5mm x 5mm 32-Pin QFN Package APPLICATIONS Point of Load Regulator in Distributed Power Systems Digital Set Top Boxes Personal Video Recorders Broadband Communications Flat Panel Television and Monitors 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 V IN 29,30,31 21,22,23,24 IN1 IN2 5 16 BST1 BST2 1,2,3,4 25,26,27 V SW1 SW2 OUT1 V OUT2 MP8642 2.5V 3A 7 14 M2 BG1 BG2 M3 17 11 FB1 FB2 10 18 PG1 PG2 15 6 VCC1 VCC2 V CC VCC 9 19 EN/SYNC1 EN/SYNC2 OFF ON ON OFF GND1 GND2 8 12,13 MP8642 Rev. 1.0 www.MonolithicPower.com 1 9/13/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2012 MPS. All Rights Reserved. SW2 BST2 SW2 VCC2 SW2 BG2 N/C GND2 IN1 GND2 IN1 FB1 IN1 PG1 N/C EN/SYNC1 MP8642 DUAL 3A, 23V, 600kHz STEP-DOWN CONVERTER ORDERING INFORMATION Part Number* Package Top Marking Free Air Temperature (T ) A MP8642DU QFN32 (5mm x5mm) M8642DU 40 C to +85C * For Tape & Reel, add suffix Z (e.g. MP MP8642DUZ) For RoHS compliant packaging, add suffix LF (e.g. MP8642DULFZ) PACKAGE REFERENCE 32 31 30 29 28 27 26 25 SW1 1 24 IN2 2 23 SW1 IN2 SW1 3 22 IN2 4 21 SW1 IN2 BST1 5 20 N/C 6 19 VCC1 EN/SYNC2 BG1 7 18 PG2 8 17 GND1 FB2 910 11 12 13 14 15 16 (1) (4) ABSOLUTE MAXIMUM RATINGS Thermal Resistance JA JC Supply Voltage V ....................................... 25V IN 5x5 QFN32 368C/W V .........................-0.3V(-5V for < 10ns) to 26V SW Notes: V ....................................................... V + 6V BS 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 (2) maximum junction temperature T (MAX), the junction-to- J Continuous Power Dissipation (T = +25C) A ambient thermal resistance , and the ambient temperature JA ...........................................................3.47W T . The maximum allowable continuous power dissipation at A any ambient temperature is calculated by P (MAX) = (T D J Junction Temperature...............................150C (MAX)-T )/ . Exceeding the maximum allowable power A JA Lead Temperature ....................................260C dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal Storage Temperature.............. 65 C to +150 C shutdown circuitry protects the device from permanent (3) damage. Recommended Operating Conditions 3) The device is not guaranteed to function outside of its operating conditions. Supply Voltage V ...........................4.5V to 23V IN 4) Measured on JESD51-7, 4-layer PCB. Output Voltage V .........................0.8V to 20V OUT Operating Junct. Temp (T )..... 40 C to +125 C J MP8642 Rev. 1.0 www.MonolithicPower.com 2 9/13/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2012 MPS. All Rights Reserved.