MP28257 4A, Fast Transient, 4.2V-to-20V Input Synchronous Step-Down Converter 2mmx3mm QFN12 The Future of Analog IC Technology DESCRIPTION FEATURES The MP28257 is a fully-integrated, synchronous, Wide 4.2V-to-20V Operating Input Range step-down, switch-mode converter with a 4A Continuous Output Current programmable frequency. It offers a very Internal 120m High-Side, 50m Low- compact solution that can provide up to 4A of Side Power MOSFETs continuous output current over a wide input Stable with Ceramic Output Capacitors supply range with excellent load and line Proprietary Switching Loss-Reduction regulation, and can operate at high efficiency Technology over a wide output current load range. Power-Good Indicator Constant-on-time control mode provides fast Soft Startup/Shutdown transient response and eases loop stabilization. Programmable Switching Frequency SCP, OCP, OVP, UVP Protection and Protections include short-circuit protection, Thermal Shutdown over-current protection, over-voltage protection, Output Adjustable from 0.815V to 13V under-voltage protection, and thermal shut Available in a 2mmx3mm QFN12 down. Package The MP28257 requires a minimal number of APPLICATIONS readily-available standard external components. Networking Systems The device is available in a space saving Distributed Power Systems 2mmx3mm QFN12 package that complies with ROHS. All MPS parts are lead-free and adhere to the RoHS directive. 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. TYPICAL APPLICATION MP28257 Rev 1.01 www.MonolithicPower.com 1 4/13/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2020 MPS. All Rights Reserved. NOT RECOMMENDED FOR NEW DESIGNS REFER TO MP2384MP28257 4A, 4.2V-TO-20V, FAST TRANSIENT, SYNCHRONOUS STEP-DOWN CONVERTER ORDERING INFORMATION Part Number OCP Protection Package Top Marking Free Air Temperature (T ) A QFN12 (2x3mm) MP28257DD* Latch-off Mode ABF -40C to +85C * For Tape & Reel, add suffix Z (e.g. MP28257DDZ). For RoHS Compliant Packaging, add suffix LF (e.g. MP28257DDLFZ) PACKAGE REFERENCE TOP VIEW GND 12 GND 1 11 GND 10 SW 2 SW SW 9 BST 3 IN 4 8 VCC FREQ 7 5 EN FB 6 PG QFN12 (2x3mm) (4) (1) Thermal Resistance JA JC ABSOLUTE MAXIMUM RATINGS QFN12 (2x3mm) ..................... 70 ....... 15 ... C/W Supply Voltage V ........................................ 22V IN V ...................................... -0.3V to (V + 0.3V) SW IN Notes: 1) Exceeding these ratings may damage the device. V .......................................................... V +6V BST SW 2) The maximum allowable power dissipation is a function of the All other pins ................................... -0.3V to +6V maximum junction temperature TJ (MAX), the junction-to- (2) ambient thermal resistance JA, and the ambient temperature Continuous Power Dissipation (T = 25C) A TA. The maximum allowable continuous power dissipation at QFN12 (2x3mm) ......................................... 1.8W any ambient temperature is calculated by PD (MAX) = (TJ Junction Temperature .............................. 150C (MAX)-TA)/ JA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the Lead Temperature .................................... 260C regulator will go into thermal shutdown. Internal thermal Storage Temperature ................ -65C to +150C shutdown circuitry protects the device from permanent damage. (3) 3) The device is not guaranteed to function outside of its Recommended Operating Conditions operating conditions. Supply Voltage V ........................... 4.2V to 20V IN 4) Measured on JESD51-7, 4-layer PCB. Output Voltage V ..................... 0.815V to 13V OUT Maximum Junction Temp. (T ) .................. 125C J MP28257 Rev 1.01 www.MonolithicPower.com 2 4/13/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2020 MPS. All Rights Reserved. NOT RECOMMENDED FOR NEW DESIGNS REFER TO MP2384