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TPS56637: Marking naming formula of TPS56637

Part Number: TPS56637

Hi team,

My customer is building the board with our TPS56637 . They have some concern about the marking naming rule.

Please refer the below figure. In Ti.com, the marking number will be T56637 but it shows different characters in the received silicon.

May I have your help to understand the naming formula of TPS56637? Thanks.