The MP8864 is a high-frequency, synchronous, rectified, step-down, switch-mode converter with an I2 C control interface. It offers a very compact solution to achieve a 4 A continuous output current with excellent load and line regulation over a wide input supply range. The MP8864 has synchronous-mode operation for higher efficiency over the output load range. The reference voltage level is controlled, on-the-fly through a 3.4 Mbps I2 C serial interface. The voltage range can be adjusted from 0.6 V to 1.87 V in 10 mV steps. Also, the voltage slew rate, switching frequency, enable, and power-saving mode are selectable through the I2 C interface. Current-mode operation provides fast transient response and eases loop stabilization. Full protection features include over-current protection (OCP), over-voltage protection (OVP), and thermal shutdown (TSD). The MP8864 requires a minimal number of readily available, standard external components and is available in a 15-pin QFN15 (3mm x 3mm) package.Wide 4.5 V to 21 V Operation Input Range 50 m?/23 m? Low RDS(ON) Internal Power MOSFETs 1% VOUT Accuracy I2 C Programmable Reference Voltage Range from 0.6 V to 1.87 V in 10 mV Steps with Slew-Rate Control I2 C Selectable Switching Frequency. Default 600 kHz Switching Frequency Programmable Output Voltage Power-Saving Mode, OTP, and OCP via I2 C Power Good Indication 1-Bit I2 C Address Set Pin OCP in Hiccup Mode External Soft-Start Available in a QFN 3mm x 3mm Package