MPQ4459 Industrial Grade,1.5A, 4MHz, 36V Step-Down Converter The Future of Analog IC Technology DESCRIPTION FEATURES The MPQ4459 is a high frequency step-down Guaranteed Industrial Temp Range switching regulator with an integrated internal 120 A Quiescent Current high-side high voltage power MOSFET. It Wide 3.8V to 36V Operating Input Range provides 1.5A output with current mode control 150m Internal Power MOSFET for fast loop response and easy compensation. Up to 4MHz Programmable Switching Frequency The wide 3.8V to 36V input range Ceramic Capacitor Stable accommodates a variety of step-down Internal Soft-Start applications, including those in automotive systems. A 120A operational quiescent current Precision Current Limit without a Current is suitable for use in battery-powered Sensing Resistor applications. Up to 95% Efficiency Output Adjustable from 0.8V to 30V The frequency foldback helps prevent inductor Available in 10-Pin 3x3 TQFN Package current runaway during startup and thermal shutdown provides reliable, fault tolerant APPLICATIONS operation. High Voltage Power Conversion By switching at 4MHz, the MPQ4459 prevents Automotive Systems EMI (Electromagnetic Interference) noise Industrial Power Systems problems, such as those found in AM radio and Distributed Power Systems ADSL applications. Battery Powered Systems The MPQ4459 is available in thin 10-pin 3mm x All MPS parts are lead-free and adhere to the RoHS directive. For MPS green 3mm TQFN package. status, please visit MPS website under Quality Assurance. MPS and The Future of Analog IC Technology are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION Efficiency vs Load Current C3 100 V =5V 150pF I 4 8, 9 90 COMP VIN V IN 4.5V to 36V 80 V =24V I 3 10 V =12V EN BST 70 I CONTROL C4 MPQ4459 100nF 60 7 1, 2 FREQ SW V OUT 50 5V 1.5A 10MQ100N 40 5 6 FB GND V =3.3V 30 O 20 0 500 1000 1500 LOAD CURRENT (mA) MPQ4459 Rev. 1.01 www.MonolithicPower.com 1 1/24/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2014 MPS. All Rights Reserved. EFFICIENCY (%)MPQ4459 INDUSTRIAL GRADE, 1.5A, 4MHz, 36V STEP-DOWN CONVERTER ORDERING INFORMATION Part Number* Package Top Marking MPQ4459DQT TQFN10(3mm x 3mm) N4 * For Tape & Reel, add suffix Z (eg. MPQ4459DQTZ) For RoHS compliant packaging, add suffix LF(eg. MPQ4459DQTLFZ) 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 3x3 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) maximum junction temperature T(MAX), the junction-to- J Continuous Power Dissipation (T = +25C) A ambient thermal resistance , and the ambient temperature JA .2.5W T . The maximum allowable continuous power dissipation at A Junction Temperature...............................150C any ambient temperature is calculated by P (MAX)=(TJ(MAX)-TA)/ . Exceeding the maximum D 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) permanent damage. Recommended Operating Conditions 3) The device is not guaranteed to function outside of its Supply Voltage V ...........................3.8V to 36V IN operating conditions. 4) Measured on JESD51-7, 4-layer PCB. Output Voltage V .........................0.8V to 30V OUT Operating Junct. Temp (T )..... 40 C to +125 C J MPQ4459 Rev. 1.01 www.MonolithicPower.com 2 1/24/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2014 MPS. All Rights Reserved.