MP28275EL-LF-P

MP28275 7V, 5A, 1.1MHz Synchronous Step-down Converter The Future of Analog IC Technology DESCRIPTION FEATURES The MP28275 is a high frequency synchronous rectified step-down switch mode converter with built-in internal power MOSFETs. It offers a very compact solution to achieve 5A continuous output current with excellent load and line regulation. The MP28275 operates at high efficiency over a wide output current load range.     Current mode operation provides fast transient response and eases loop stabilization. Full protection features include OCP and thermal shut down. The MP28275 requires a minimum number of readily available standard external components and is available in a space saving 3mm x 4mm 14-pin QFN package.        4.5V to 7V Operating Input Range 5A Output Current Low RDS(ON) Internal Power MOSFETs Proprietary Switching Loss Reduction Technique Fixed 1.1MHz Switching Frequency Sync from 300kHz to 2MHz External Clock Internal Compensation Thermal Shutdown Over-Current-Protection and Hiccup Output Adjustable from 0.8V Available in 3x4mm QFN14 Package APPLICATIONS       Notebook Systems and I/O Power Networking Systems Digital Set Top Boxes Personal Video Recorders Flat Panel Television and Monitors Distributed Power Systems “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. The information in this datasheet about the product and its associated technologies are proprietary and intellectual property of Monolithic Power Systems and are protected by copyright and pending patent applications. TYPICAL APPLICATION （FOR NOTEBOOK） Efficiency VOUT=1.2V IN BST C4 0.1uF C1 22uF 11 C3 0.1uF PG EN 100 6 VCC R3 100K 9 7 MP28275 2, 3 SW 4, 5 PG EN/SYNC GND 12, 13, 14 80 L1 1.2uH VOUT 1.2V@5A R1 5K FB V IN=5V 90 C2 47uF 8 Rt 25K R2 10K EFFICIENCY (%) 1 70 V IN=7V 60 50 40 30 20 10 0 0 1 2 3 4 5 OUTPUT CURRENT (A) MP28275 Rev. 1.0 5/29/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 1 MP28275 – 5A, 7V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS ORDERING INFORMATION Part Number* Package Top Marking Free Air Temperature (TA) MP28275EL 3x4 QFN14 MP28275 -20C to +85C * For Tape & Reel, add suffix –Z (e.g.MP28275EL–Z). For RoHS compliant packaging, add suffix –LF (e.g.MP28275EL–LF–Z) PACKAGE REFERENCE TOP VIEW PIN 1 ID IN GND SW GND SW GND SW VCC SW NC BST PG EN/SYNC FB EXPOSED PAD ON BACKSIDE ABSOLUTE MAXIMUM RATINGS (1) Supply Voltage VIN ......................................... 9V VSW ..........................-0.3V (-5V for65% VIN In this case, an external BST diode is recommended from the VCC pin to BST pin, as shown in Figure 8 BST MP28275 SW External BST Diode IN4148 VCC CBST L COUT Figure 8—Add Optional External Bootstrap Diode to Enhance Efficiency The recommended external BST diode is IN4148, and the BST cap is 0.1~1µF. MP28275 Rev. 1.0 5/29/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 13 MP28275 – 5A, 7V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS PACKAGE INFORMATION 3mm x 4mm QFN14 NOTICE: The information in this document is subject to change without notice. Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. MP28275 Rev. 1.0 5/29/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 14