LMZ34002: Output capacitor derating

Part Number: LMZ34002

Hello,

I am using LMZ34002 to go from 24V to -12V @ 1A.  I see different capacitors in the datasheet but most are rated at 16V and I usually derate higher but I am having a hard time finding cermics above 16V in the large densities recommended in the datasheet.

Is there a derating guideline that should be used for the inverting configuration that is different than a traditional buck configuration?

-Jason