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Hi Shen,
You are absolutely correct.
The GND terminal is the reference for all internal signals and must be isolated from any bounce due to large switching currents in the system power ground plane. It is recommended to connect the device GND to a signal ground island on the board, which in turn is connected to the system power GND plane at one point.
Can you share your system requirements? voltage, current, telemetry etc ?
Please also have look at LM5066i, TPS25982.
Best Regards, Rakesh