MP1584 3A, 1.5MHz, 28V Step-Down Converter The Future of Analog IC Technology DESCRIPTION FEATURES The MP1584 is a high frequency step-down Wide 4.5V to 28V Operating Input Range switching regulator with an integrated internal Programmable Switching Frequency from high-side high voltage power MOSFET. It 100kHz to 1.5MHz provides 3A output with current mode control for High-Efficiency Pulse Skipping Mode for fast loop response and easy compensation. Light Load Ceramic Capacitor Stable The wide 4.5V to 28V input range accommodates Internal Soft-Start a variety of step-down applications, including Internally Set Current Limit without a those in an automotive input environment. A Current Sensing Resistor 100A operational quiescent current allows use in battery-powered applications. Available in SOIC8E Package. High power conversion efficiency over a wide APPLICATIONS load range is achieved by scaling down the High Voltage Power Conversion switching frequency at light load condition to Automotive Systems reduce the switching and gate driving losses. Industrial Power Systems The frequency foldback helps prevent inductor Distributed Power Systems current runaway during startup and thermal Battery Powered Systems shutdown provides reliable, fault tolerant MPS and The Future of Analog IC Technology are Registered Trademarks of operation. Monolithic Power Systems, Inc. By switching at 1.5MHz, the MP1584 is able to prevent EMI (Electromagnetic Interference) noise problems, such as those found in AM radio and ADSL applications. The MP1584 is available in a thermally enhanced SOIC8E package. TYPICAL APPLICATION Efficiency Curve C4 100nF (f =500kHz) SW 100 V =12V IN 8 90 7 1 BST V OUT 80 SW V VIN IN 3.3V 70 D1 V =24V IN 60 2 4 FB EN EN 50 MP1584 40 30 6 3 COMP FREQ 20 C3 GND 220pF 10 C6 5 NS 0 0.01 0.1 1 10 OUTPUT CURRENT (A) MP1584 Rev. 1.0 www.MonolithicPower.com 1 8/8/2011 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. 2011 MPS. All Rights Reserved. NOT RECOMMENDED FOR NEW DESIGNS REFER TO MP2338 EFFICIENCY (%)MP1584 3A, 1.5MHz, 28V STEP-DOWN CONVERTER ORDERING INFORMATION Part Number* Package Top Marking Free Air Temperature (T ) A MP1584EN SOIC8E MP1584EN 20 C to +85C * For Tape & Reel, add suffix Z (e.g. MP1584ENZ) For RoHS Compliant Packaging, add suffix LF. (e.g. MP1584ENLFZ) PACKAGE REFERENCE TOP VIEW SW 1 8 BST EN 2 7 VIN COMP 3 6 FREQ FB 4 5 GND Operating Junct. Temp (T ) ..... 20 C to +125 C (1) J ABSOLUTE MAXIMUM RATINGS (4) Supply Voltage (V ) ..................... 0.3V to +30V Thermal Resistance IN JA JC Switch Voltage (V ) ............ 0.3V to V + 0.3V SW IN SOIC8E .................................. 50 ...... 10 ... C/W BST to SW ..................................... 0.3V to +6V Notes: All Other Pins ................................. 0.3V to +6V 1) Exceeding these ratings may damage the device. Continuous Power Dissipation (T = A 2) The maximum allowable power dissipation is a function of the (2) +25C) maximum junction temperature T(MAX), the junction-to- J ambient thermal resistance , and the ambient temperature JA ............................................................. 2.5W T . The maximum allowable continuous power dissipation at A Junction Temperature ............................... 150 C any ambient temperature is calculated by P (MAX)=(T (MAX)- D J T )/ . Exceeding the maximum allowable power dissipation A JA Lead Temperature .................................... 260 C will cause excessive die temperature, and the regulator will go Storage Temperature .............. 65C to +150C into thermal shutdown. Internal thermal shutdown circuitry (3) protects the device from permanent damage. Recommended Operating Conditions 3) The device is not guaranteed to function outside of its Supply Voltage V ........................... 4.5V to 28V operating conditions. IN 4) Measured on JESD51-7, 4-layer PCB. Output Voltage V ......................... 0.8V to 25V OUT MP1584 Rev. 1.0 www.MonolithicPower.com 2 8/8/2011 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. 2011 MPS. All Rights Reserved. NOT RECOMMENDED FOR NEW DESIGNS REFER TO MP2338