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LM5164: VIN and VOUT relationship

Genius 16065 points
Part Number: LM5164

Hello,

I have a question for LM5164.

I checked LM5164-Q1 EVM user's guide and found this EVM supports VOUT=12V with VIN > 15V.

LM5164's minimum OFF time is relatively short, 50nsec, I think 3V dropout is not actually needed. Maybe around 1V is enough.
Is there any special reason that this EVM require over 15VIN for 12V OUT?

Regards,
Oba