TPS650830 can support 24V vin?

We don't recommend operating the device with a VIN that is greater than 24V including input ripple. This means that basically ~21V is the max DC input voltage acceptable for the device.

A well laid out PCB will reduce the magnitude of the overshoot and ringing. See this application note for more detail: www.ti.com/.../slpa010.pdf

This is because of the SW overshoots and ringing that are typical with controllers. You must allow for enough margin to account for those overshoots on the SW node, DRV and BOOT pins. These overshoots can be quite large sometimes up to 2x. You can limit them with DRV and BOOT resistors to slow the switching time which will reduce the overshoots. Another technique is RC snubber on the SW node. All of these techniques reduce efficiency of the converter. Even with these techiques it is very difficult to eliminate all the overshoot thus, we recommend the margin for max VIN to abs max of the pins.

For more information please refer to http://www.ti.com/lit/an/slyt465/slyt465.pdf for more detail on gate resistors and snubbers.

Also, note if this is a Skylake S design, most systems require a 12V supply. May be they can pre-regulate down to 12V then run off that. The 12V would still be available for the other peripherals in the system.