The MP8845C is a highly integrated and high frequency synchronous step-down switcher with I2C control interface. It is optimized to support up to 5A load current over an input supply range from 2.7V to 6V with excellent load and line regulation. Constant frequency hysteretic control mode provides extremely fast transient response without loop compensation and easily achieves high efficiency under light load condition. The output voltage level can be controlled, on-the fly through a 3.4Mbps I2C serial interface. Voltage range can be adjusted from 0.6V to 1.45V in 6.69mV steps. Voltage slew rate, switching frequency and power savings mode are also selectable through the I2C interface. Fully protection features includes internal soft start, over current protection and over temperature protection. The MP8845C requires a minimum number of readily available standard external components and is available in the compact WLCSP20-1.6mmx2mm package.