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