MP4459 1.5A, 4MHz, 36V Step-Down Converter The Future of Analog IC Technology DESCRIPTION FEATURES The MP4459 is a high frequency step-down 120 A Quiescent Current switching regulator with an integrated internal Wide 3.8V to 36V Operating Input Range high-side high voltage power MOSFET. It 150m Internal Power MOSFET provides 1.5A output with current mode control Up to 4MHz Programmable Switching for fast loop response and easy compensation. Frequency Ceramic Capacitor Stable The wide 3.8V to 36V input range Internal Soft-Start accommodates a variety of step-down Precision Current Limit without a Current applications, including those in automotive Sensing Resistor systems. A 120A operational quiescent current is suitable for use in battery-powered Up to 95% Efficiency applications. Output Adjustable from 0.8V to 30V Available in 10-Pin 3x3mm TQFN Package The frequency foldback helps prevent inductor current runaway during startup and thermal APPLICATIONS shutdown provides reliable, fault tolerant High Voltage Power Conversion operation. Automotive Systems In some applications, such as AM radio and Industrial Power Systems ADSL applications, in which the device is Distributed Power Systems sensitive to frequency band, the MP4459 can Battery Powered Systems avoid the related EMI problem by setting the All MPS parts are lead-free and adhere to the RoHS directive. For MPS green frequency at 4MHz. status, please visit MPS website under Products, Quality Assurance page. MPS and The Future of Analog IC Technology are registered trademarks of The MP4459 is available in thin 10-pin 3mm x 3mm Monolithic Power Systems, Inc. TQFN package. TYPICAL APPLICATION Efficiency vs Load Current 100 V =5V C3 I 150pF 90 4 8, 9 COMP VIN V IN 80 3.8V to 36V V =24V I 3 10 V =12V 70 I EN BST CONTROL C4 MP4459 100nF 60 7 1, 2 V FREQ SW OUT 50 5V 1.5A 10MQ100N 5 6 FB GND 40 V =3.3V 30 O 20 0 500 1000 1500 LOAD CURRENT (mA) MP4459 Rev. 1.03 www.MonolithicPower.com 1 4/9/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2014 MPS. All Rights Reserved. EFFICIENCY (%)MP4459 1.5A, 4MHz, 36V STEP-DOWN CONVERTER ORDERING INFORMATION Part Number* Package Top Marking MP4459DQT 3x3mm TQFN10 N4 * For Tape & Reel, add suffix Z (e.g. MP4459DQTZ) For RoHS, compliant packaging, add suffix LF (e.g. MP4459DQTLFZ). PACKAGE REFERENCE TOP VIEW SW 1 10 BST SW 2 9 VIN EN 3 8 VIN COMP 4 7 FREQ FB 5 6 GND EXPOSED PAD ON BACKSIDE (1) (4) ABSOLUTE MAXIMUM RATINGS Thermal Resistance JA JC Supply Voltage (V ).....................0.3V to +40V 3x3mm TQFN10 ..................... 50...... 12... C/W IN Switch Voltage (V )............ 0.3V to V + 0.3V SW IN Notes: BST to SW .....................................0.3V to +6V 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) (MAX), the junction-to- maximum junction temperature T J Continuous Power Dissipation (T = +25C) A ambient thermal resistance , and the ambient temperature JA 3x3mm TQFN10 ........................................ 2.5W 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.............. 65C to +150C shutdown circuitry protects the device from permanent (3) damage. Recommended Operating Conditions 3) The device is not guaranteed to function outside of its Supply Voltage V ...........................3.8V to 36V operating conditions. IN 4) Measured on JESD51-7, 4-layer PCB. Output Voltage V .........................0.8V to 30V OUT Operating Junct. Temp......... 40C to +125 C MP4459 Rev. 1.03 www.MonolithicPower.com 2 4/9/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2014 MPS. All Rights Reserved.