A DC to DC boost converter or step-up converter aids in stepping up a DC voltage from the input to the output. The conduction state of the switch dictates the operation of the circuit. During the on-state, the current flowing through the inductor increases linearly.
DC-DC step-down converters basically take a higher input voltage and converts it to a lower output voltage by chopping it up by rapidly switching the output power transistor on and off so that the output essentially looks like a square wave and then using an LC filter to smooth it back into a DC voltage on the output ...
For low-power DC/DC conversion-based applications, most modern power conversion is accomplished using three major types of power converters – buck, boost, and buck-boost. However, some specific electronic circuits require power sources with the negative voltage at the output side.