A buck converter is a simple converter that is used to step down the voltage and step up the current. It is a high efficiency step-down DC/DC switching converter. Buck converters works 95% or with more higher efficiency for integrated circuits.

Duty-cycle is one key to measure the buck converters' output current capability. Duty cycle is the time period during which a device is said to be operated. Here, is the equation to find the duty cycle for buck converter.