In datasheet ADP7182，it said ‘’The exposed pad is electrically connected to VIN inside the package. and must be connected to the VIN plane on the board for proper operation‘.
But I tested the chip and found they are not connected.
Why？ And in my PCB，exposed Pad is not connected to any net . Is there any problem for noise or other performance?
The same question is for ADM7151. Is the exposed pad must connected to ground?