MP4458DQT-LF-P Monolithic Power Systems

MP4458 1A, 4MHz, 36V Step-Down Converter The Future of Analog IC Technology FEATURES DESCRIPTION 120 A Quiescent Current The MP4458 is a high frequency step-down Wide 3.8V to 36V Operating Input Range switching regulator with an integrated internal 300m Internal Power MOSFET high-side high voltage power MOSFET. It Up to 4MHz Programmable Switching provides 1 A output with current mode control Frequency for fast loop response and easy compensation. 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 Up to 95% Efficiency is suitable for use in battery-powered Output Adjustable from 0.8V to 30V applications. Available in 10-Pin 3x3mm TQFN Package The frequency foldback helps prevent inductor APPLICATIONS current runaway during startup and thermal shutdown provides reliable, fault tolerant High Voltage Power Conversion operation. Automotive Systems Industrial Power Systems In some applications, such as AM radio and Distributed Power Systems ADSL applications, in which the device is sensitive to frequency band, the MP4458 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 MP4458 is available in thin 10-pin 3mm x 3mm Monolithic Power Systems, Inc. TQFN package. TYPICAL APPLICATION Efficiency vs Load Current 100 V =5V I C3 90 150pF 4 8, 9 COMP VIN V IN 80 36V Max V =24V I 3 10 V =12V 70 I CONTROL EN BST C4 MP4458 100nF 60 7 1, 2 FREQ SW V OUT 50 5V 1A 10MQ100N 5 6 FB GND 40 V =3.3V 30 O 20 0 500 1000 LOAD CURRENT (mA) MP4458 Rev. 1.03 www.MonolithicPower.com 1 2/26/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2014 MPS. All Rights Reserved. EFFICIENCY (%)MP4458 1A, 4MHz, 36V STEP-DOWN CONVERTER ORDERING INFORMATION Part Number* Package Top Marking MP4458DQT 3x3mm TQFN10 T2 * For Tape & Reel, add suffix Z (e.g. MP4458DQTZ) For RoHS, compliant packaging, add suffix LF (e.g. MP4458DQTLFZ). 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 maximum junction temperature T (MAX), the junction-to- J Junction Temperature...............................150C ambient thermal resistance , and the ambient temperature JA (2) Continuous Power Dissipation (T = +25C) T . The maximum allowable continuous power dissipation at A A any ambient temperature is calculated by P (MAX) = (T D J 3x3 TQFN10 .............................................. 2.5W (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 board. Output Voltage V .........................0.8V to 30V OUT Operating Junct. Temp......... 40C to +125 C MP4458 Rev. 1.03 www.MonolithicPower.com 2 2/26/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2014 MPS. All Rights Reserved.