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LM5164-Q1EVM: high low side FET difference on EVM board

Part Number: LM5164-Q1EVM
Other Parts Discussed in Thread: LM5164-Q1, LM5146-Q1

hi Team,

our customer has a question that on the LM5164-Q1 EVM board

we see that the high/low side FET, Q1 and Q2. are two different part numbers with Q1 at 22mohm and Q2 at 10mohm.

may we check on what's the consideration on this design?