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The DIO61300 is a high-efficiency, 1.8 MHz synchronous step-down DC-DC regulator IC capable of delivering an up to 3 A output current. The device provides high-efficiency step-down DC-DC conversion with an 80 mΩ high-side power MOSFET and a 50 mΩ low-side power MOSFET. To achieve fast transient response, easy loop stabilization, and low output voltage ripple, the DIO61300 minimizes the external component count by adopting constant on-time (COT) control. The DIO61300 operates over a wide input voltage ranging from 2.4 V to 5.5 V and integrate with a main switch and a synchronous switch with very low RDS(ON) to minimize the conduction loss. Low output voltage ripple and small external inductor and capacitor sizes are achieved with a 1.8 MHz switching frequency.