Is the exposed pad of ADP2120 internally connected to GND pin? Or floating ?
The exposed pad of ADP2120 is NOT internally connected to GND pin. It say in the datasheet " The exposed pad should be soldered to an external ground plane underneath the IC for thermal dissipation."
Thank you for your reply. I'd like to know more. From what terms can we understand that it is internally unconnected?
I believed that even the exposed pad internally connected to GND pin needs to connect external ground plane.
Usually it is not specified in the datasheet whether the exposed pad is internally connected to GND pin or not. As you mentioned, the exposed pad needs to be connected to the GND pin and the external ground plane regardless whether it is internally connected or not. For some ICs, the exposed pad are internally connected to GND pin, however, some others are not. If you measure the resistance between the exposed pad and the GND pin of the ADP2120, you will find out that they are not internally connected.
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