MP38876DL-LF-P Monolithic Power Systems

MP38876 15A, 28V, High Frequency Step-Down Converter with Synchronous Gate Driver The Future of Analog IC Technology DESCRIPTION FEATURES The MP38876 is a monolithic step-down switch Wide 4.5V to 28V Operating Input Range mode converter with a built in internal power 15A Output Current MOSFET. It achieves 15A continuous output 25m Internal Power MOSFET Switch current over a wide input supply range with Synchronous Gate Driver excellent load and line regulation. Synch from 300kHz to > 1MHz External Clock or 400kHz Fixed Switching Frequency Current mode operation provides fast transient Synch Output to Drive Another Regulator in response and eases loop stabilization. Phase-Shift Operation Fault condition protection includes cycle-by-cycle Feedback Voltage Accuracy: 2% current limiting and thermal shutdown. Programmable Soft-Start The MP38876 requires a minimum number of Startup Tracking readily available standard external components EN and Power Good for Power Sequencing and is available in a 20-pin 3mm x 4mm QFN Cycle-by-Cycle Over Current Protection package. Thermal Shutdown Output Adjustable from 0.8V to 12V The MP38876 is ideal for a wide range of Stable with Low ESR Output Ceramic applications including distributed power systems, Capacitors pre-regulator for linear regulators, compact DC- DC regulators for PCB space limited platforms. Available in a 3mm x 4mm QFN Package APPLICATIONS Distributed Power Systems Pre-Regulator for Linear Regulators Compact DC-DC Regulator for PCB Space Limited Platforms MPS and The Future of Analog IC Technology are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION VCC Efficiency vs. Output Current V =12V,V =1.2V IN OUT System 95 V IN PG BST IN 90 85 V OUT SW 1.2V/15A COMP 80 M2 R3 VCC BG 75 MP38876 70 SS/TRK C6 C3 FB 65 60 OFF ON EN SYNCIN 55 SYNCOUT GND 50 0 2 4 6 8 10 12 14 16 OUTPUT CURRENT(A) MP38876 Rev. 0.91 www.MonolithicPower.com 1 11/4/2009 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. 2009 MPS. All Rights Reserved. EFFICIENCY (%)MP38876 15A, 28V, HIGH FREQUENCY STEP-DOWN WITH SYNCHRONOUS GATE DRIVER ORDERING INFORMATION Part Number* Package Top Marking Free Air Temperature (T ) A 3mm x 4mm QFN20 MP38876DL 38876 40 C to +85C * For Tape & Reel, add suffix Z (e.g. MP38876DLZ). For RoHS compliant packaging, add suffix LF (e.g. MP38876DLLFZ) PACKAGE REFERENCE TOP VIEW PIN 1 ID GND GATE VIN 20 19 18 VCC 1 17 SYNCOUT 2 16 15 SYNCIN 3 EN 4 VIN 14 SW SS/TRK 5 13 12 FB 6 11 COMP 7 89 10 PG BST VIN (4) (1) Thermal Resistance JA JC ABSOLUTE MAXIMUM RATINGS QFN20 (3mm x 4mm) .............48 ...... 11... C/W Supply Voltage V ....................................... 30V IN V ....................................... 0.3V to V + 0.3V Notes: SW IN 1) Exceeding these ratings may damage the device. V ....................................................... V + 6V BS SW 2) The maximum allowable power dissipation is a function of the All Other Pins.................................0.3V to +6V maximum junction temperature T (MAX), the junction-to- J (2) ambient thermal resistance , and the ambient temperature JA Continuous Power Dissipation (T = +25C) A T . The maximum allowable continuous power dissipation at A ....2.9W any ambient temperature is calculated by P (MAX) = (T D J (MAX)-T )/ . Exceeding the maximum allowable power A JA Junction Temperature...............................150C dissipation will cause excessive die temperature, and the Lead Temperature ....................................260C regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent Storage Temperature.............. 65 C to +150 C damage. (3) 3) The device is not guaranteed to function outside of its Recommended Operating Conditions operating conditions. 4) Measured on JESD51-7, 4-layer PCB. Supply Voltage V ...........................4.5V to 28V IN Output Voltage V ....................0.8V to V -4V OUT IN Operating Junct. Temp (T )..... 40 C to +125 C J MP38876 Rev. 0.91 www.MonolithicPower.com 2 11/4/2009 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. 2009 MPS. All Rights Reserved.