MP28262EL-LF-P

MP28262 2A, 21V, 1.1MHz Synchronous Step-down Converter The Future of Analog IC Technology DESCRIPTION FEATURES The MP28262 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 2A continuous output current over a wide input supply range with excellent load and line regulation. The MP28262 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. Wide 4.5V to 21V Operating Input Range 2A Output Current Low RDS(ON) Internal Power MOSFETs Proprietary Switching Loss Reduction Technique Fixed 1.1MHz Switching Frequency Sync from 400kHz to 2MHz External Clock Internal Compensation OCP Protection and Thermal Shutdown Output Adjustable from 0.8V Available in 14-pin QFN3x4 Package APPLICATIONS • • • • • • The MP28262 requires a minimum number of readily available standard external components and is available in a space saving 3mm x 4mm 14-pin QFN package. 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 Efficiency VOUT=1.2V IN BST 9 PG PG R3 100K 11 SW ON/OFF 2,3,4,5 MP28262 VCC FB 7 6 8 Rt 24.9K R1 4.99K R2 10K EN/SYNC NC 10 GND AGND 12,13 14 EFFICIENCY (%) 1 VIN 100 90 Vin=5V 80 70 60 Vin=12V 50 Vin=21V 40 30 20 10 0 0 0.5 1 1.5 2 OUTPUT CURRENT (A) MP28262 Rev. 0.92 4/28/2010 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. 1 MP28262 – 2A, 21V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS ORDERING INFORMATION Part Number* Package Top Marking Free Air Temperature (TA) MP28262EL 3x4 QFN14 28262 –20°C to +85°C * For Tape & Reel, add suffix –Z (e.g. MP28262EL–Z). For RoHS compliant packaging, add suffix –LF (e.g. MP28262EL–LF–Z) PACKAGE REFERENCE TOP VIEW PIN 1 ID IN AGND SW GND SW GND SW VCC SW NC BST PG EN/SYNC FB EXPOSED PAD ON BACKSIDE ABSOLUTE MAXIMUM RATINGS (1) Operating Junct. Temp (TJ) .....–20°C to +125°C 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 External BST Diode IN4148 BST MP28262 SW O 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. MP28262 Rev. 0.92 4/28/2010 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. 13 MP28262 – 2A, 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. MP28262 Rev. 0.92 4/28/2010 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. 14