Hi ashahril170596,
To change the output on the LTC3588 you need to adjust the jumpers for D0 and D1 on the board. It comes pre-configured for 3.3V out. The logic table for setting the output voltage can be found on page 9 of the [LTC3588 Datasheet. Here’s a quick “logic table” for reference but the datasheet will have more information:
I hope this helps!](https://cdn.sparkfun.com/datasheets/BreakoutBoards/35881fc.pdf)