The light load efficiency can be greatly improved by turning off the low side MOSFET upon reversal of inductor current. There is no need for a current sensing resistor because the MOSFET on resistance is used as the sensing element. Under extreme light load conditions, the device will operate in a pulse skip mode. The switching frequency can be dropped significantly to a level programmed by external resistors. The battery energy is better utilized with these efficiency enhancement schemes. The power sequencing is fully supported including independent start up and power good output. In shutdown mode the controller only draws 100nA from the supply. The controller also offers full protection features for the conditions of under voltage, over voltage, and over current. The switching frequency is adjustable from 100KHz to 300KHz. TSSOP-28-EDP package is offered.