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The DIO6156 is a high-efficiency, high-frequency synchronous step-down DC-DC regulator IC capable of delivering more than 3 A output currents. The DIO6156 features a selection function that switches the device between the force pulse width modulation (FPWM) and auto mode. When the SEL pin is driven HIGH, the DIO6156 enters (FPWM) mode. The device enters the auto mode if the SEL pin is LOW. If the DIO6156 is selected to work under FPWM mode, the device works with ultra-low output ripple. Under auto mode, the DIO6156 works in PWM (Pulse Width Modulation) mode under medium to heavy load. In such conditions, the DIO6156 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 DIO6156 automatically enters PSM (Power Save Mode) for high efficiency. The DIO6156 has a fast transient response feature. The device operates over a wide input range from 2.1 V to 5.5 V with very low RDS(ON) to minimize the conduction loss. The DIO6156 is capable of delivering output down to 0.6 V with a feedback voltage of ±6 mV accuracy over -20°C to 85°C junction temperature.