DRV8323 input voltage questions

When using a DRV8323 gate driver, do I need to keep its input voltage under the maximum gate voltage of my driver?

My target voltage for my board is 30v but the mosfet gates I plan to use can only tolerate around 20v.

I am unfamiliar with working with gate drivers or mosfets and I can’t really find an answer in the documentation.

No, you don’t.
The DRV8323 has internal voltage regulators to keep the gate voltage at around 11V.

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