MP28255EL-LF-Z

MP28255 21V, 4A, 500kHz Synchronous Step-down Converter The Future of Analog IC Technology DESCRIPTION FEATURES The MP28255 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 4A continuous output current over a wide input supply range with excellent load and line regulation. The MP28255 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 MP28255 requires a minimum number of readily available standard external components and is available in a space saving 3mm x 4mm 14-pin QFN package. Wide 4.5V to 21V Operating Input Range 4A Output Current Low RDS(ON) Internal Power MOSFETs Proprietary Switching Loss Reduction Technique Fixed 500kHz Switching Frequency External Soft-Start Sync from 300kHz to 2MHz External Clock Internal Compensation Integrated Bootstrap Diode Over-Current Protection and Hiccup Thermal Shutdown Output Adjustable from 0.8V Available in 14-pin QFN3x4 Package APPLICATIONS • • • • • Networking Systems Digital Set Top Boxes Personal Video Recorders Flat Panel Television and Monitors Distributed Power Systems For MPS green status, please visit MPS website under Quality Assurance. “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 4.5V-21V 1 VIN IN BST 6 C1 22uF PG C4 0.1uF 9 PG R3 100K 11 C3 0.1uF ON/OFF 7 SW L1 2uH 2,3,4,5 1.2V/4A MP28255 VCC FB EN/SYNC SS GND 12,13 Rt 24K 8 10 C5 47nF R1 4.99K C2 47uF R2 10K AGND 14 MP28255 Rev. 1.02 www.MonolithicPower.com 9/16/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 1 MP28255 – 4A, 21V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS ORDERING INFORMATION Part Number* Package Top Marking Free Air Temperature (TA) MP28255EL 3x4 QFN14 28255 -20°C to +85°C * For Tape & Reel, add suffix –Z (e.g. MP28255EL–Z). For RoHS compliant packaging, add suffix –LF (e.g. MP28255EL–LF–Z) PACKAGE REFERENCE SS ABSOLUTE MAXIMUM RATINGS (1) Supply Voltage VIN .......................................22V 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 MP28255 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. MP28255 Rev. 1.02 www.MonolithicPower.com 9/16/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 13 MP28255 – 4A, 21V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS PACKAGE INFORMATION 3mm x 4mm QFN14 2.90 3.10 1.60 1.80 0.30 0.50 PIN 1 ID SEE DETAIL A PIN 1 ID MARKING 1 14 0.18 0.30 3.20 3.40 3.90 4.10 PIN 1 ID INDEX AREA 0.50 BSC 7 8 TOP VIEW BOTTOM VIEW 0.80 1.00 0.20 REF PIN 1 ID OPTION A 0.30x45º TYP. PIN 1 ID OPTION B R0.20 TYP. 0.00 0.05 SIDE VIEW DETAIL A 2.90 0.70 NOTE: 1.70 1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH. 3) LEAD COPLANARITY SHALL BE 0.10 MILLIMETER MAX. 4) JEDEC REFERENCE IS MO-229, VARIATION VGED-3. 5) DRAWING IS NOT TO SCALE. 0.25 3.30 0.50 RECOMMENDED LAND PATTERN 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. MP28255 Rev. 1.02 www.MonolithicPower.com 9/16/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 14