MP2238GD-Z

MP2238 High-Efficiency, 8A, 18V, Synchronous Step-Down Converter DESCRIPTION FEATURES The MP2238 is a high frequency, synchronous, rectified, step-down switch-mode converter. It offers a fully integrated solution to achieve an 8A continuous output current with excellent load and line regulation over a wide input supply range.    Constant-on-time (COT) control operation provides fast transient response. Full protection features include hiccup over-current protection and thermal shutdown. The MP2238 requires a minimal number of readily available, standard, external components with a space-saving 12-pin QFN 2mmx3mm package.        Wide 4.2V to 18V Operating Input Range 8A Continuous Output Current 22mΩ/10mΩ Low RDS(ON) Internal Power MOSFETs Default 600mV Reference Voltage Adjustable Output Voltage 600kHz Switching Frequency Ton Extension Hiccup OCP Protection Thermal Shutdown Protection Available in a 12-Pin QFN 2mmx3mm Package APPLICATIONS      Flat-Panel Television and Monitors Digital TV Power Supply Digital Set-Top Boxes Distributed Power Systems General Consumer All MPS parts are lead-free, halogen free, and adhere to the RoHS directive. For MPS green status, please visit the MPS website under Quality Assurance. “MPS”, the MPS logo, and “Simple, Easy Solutions” are trademarks of Monolithic Power Systems, Inc. or its subsidiaries. TYPICAL APPLICATION Efficiency EFFICIENCY (%) VOUT = 1V, L = 0.68μH, DCR = 3.1mΩ MP2238 Rev. 1.0 4/23/2019 100 95 90 85 80 75 70 65 60 55 50 0.01 Vin=5V Vin=12V Vin=18V 0.1 1 LOAD CURRENT (A) www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 10 1 MP2238 – 8A, 18V, SYNCHRONOUS STEP-DOWN CONVERTER ORDERING INFORMATION Part Number* MP2238GD Package QFN-12 (2mmx3mm) Top Marking See Below * For Tape & Reel, add suffix –Z (e.g. MP2238GD–Z). TOP MARKING BGB: Product code of MP2238GD Y: Year code WW: Week code LLL: Lot number PACKAGE REFERENCE TOP VIEW QFN-12 (2mmx3mm) MP2238 Rev. 1.0 4/23/2019 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 2 MP2238 – 8A, 18V, SYNCHRONOUS STEP-DOWN CONVERTER PIN FUNCTIONS PIN # Name Description 1 EN Enable pin. Pull EN high to enable the MP2238. EN has a 2MΩ pull-down resistor to GND. 2,8 SW Switch output. Connect using a wide PCB trace. 3 BST 4,5,6,7 GND 9 IN 10 AGND 11 FB 12 VCC Bootstrap. Requires a 0.1µF capacitor between SW and BST to form a floating supply across the high-side switch driver. System power ground. Reference ground of the regulated output voltage. Requires special consideration during PCB layout. Connect to ground plane with copper traces and vias. Supply voltage. The MP2238 operates from a 4.2V to 18V input rail. Requires a ceramic capacitor to decouple the input rail. Connect using a wide PCB trace. Analog ground. Connect AGND to GND. Feedback. Connect to the tap of an external resistor divider from output to GND to set the output voltage. Internal bias supply. Decouple with a 1µF capacitor. The VCC capacitor should be placed as close as possible to VCC and GND. ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance VIN …………………………….. ....... -0.3V to 20V VSW……………………… -0.3V (-6.5V for