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The DIO62864 are high-efficiency, high-frequency synchronous step-down converter IC capable of delivering up to 4 A output currents. With I2C, the device features a selection function that switches the device between forced pulse width modulation (FPWM) and auto mode by the CONTROL register. If the device is selected to work in FPWM mode, the device works with ultra-low output ripple. Under auto mode, the device works in PWM (Pulse Width Modulation) mode under medium to heavy load. In such conditions, the device functions with a 2 MHz switching frequency to minimize the size of the inductor and output capacitor. If the load drops to meet the light load condition, the device automatically enters PSM (Power Save Mode) for high efficiency. The device has a fast transient response feature. The device operates over a wide input range from 2.4 V to 5 V with very low RDS(ON) to minimize the conduction loss.