Isolated Mosfet Gate in DC to DC converter

Hello,

To give you a adequate answer to your question I am going to need a lot more information.

If your dc/dc is of high enough voltage an isolated gate drive could be used to protect lower voltage circuitry from higher voltages coupling in or isolating certain sensitive parts of a system or a physical UI.

There is a whole list of potential reasons. If you can describe your system it will be easier for you to get help to determine if and possibly why you would want an isolated gate driver for your converter