stpd01 self destructs at 15V

[mroszkobt]

I am using a STPD01 in a design for USB PD. Neat little part but I'm finding during testing that setting 15V output on this part immediately causes it's internal switching FET that most be located near the PVIN/VCC pins of the package to self destruct and short. The result is package damage and enough current is drawn to vaporize the large copper pour next to it. For values below, say 13V, it has been fine.

 

Is there anything non-obvious I missing in the schematic here? The chip should be fairly straight forward.

The PPOWER_P input is 21V during testing and there is no load on the output.

[mroszkobt]

Found the problem. There are two STPD01 in this design and the second i2c bus was being initialized to i2c peripheral of the first one by accident.

 

It appears if the STPD01 has its voltage reconfigured from say 5V (that its sitting at by default) to 15V (first write) and then back to 5V (second erroneous write) all within a millisecond, the result is the STPD01 becomes either damaged partially (in one test case, it started outputting 5.7V at default state) or it completely explodes