I recently designed a board around the D12F200A buck converter; I use it to convert from 5V down to 1.4V. Earlier today, I increased the load on the converter beyond what I had ever done (still well below its limits), and a trace blew almost instantly. However, the trace that blew was a signal trace-not a power delivery one.
I have attached photos showing where the trace blew and the current path. The trace is 20mil and the board was manufactured using 1oz copper. Could a crack in the trace or a manufacturing defect have caused this? I have used this board for a total of ~20 hours across the past few weeks.