LTC2970CUFD-1#TRPBF

Please advise the difference between the 2 parts below.
LTC2970CUFD-1#TRPBF marking: 29701
LTC2970CUFD#TRPBF marking: 2970

Checking on this. Will let you know when I have an answer.

Hopping into the convo here, but I see from the Linear Tech Datasheet:

The LTC2970-1 adds a tracking feature that can be used to turn multiple power supplies on or off in a controlled manner (page 1).

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