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Initial observations:

* Input power is on a polarized connector and verified the right way around
* Input came from a DC lab power supply with a 50ms soft start, so input dV/dt should not have been a problem
* Double checked pinout against the datasheet, looks OK
* Checked for shorts between gate and channel of Q1, none found
* VIN to ground (with the fried chip still on the board) measures 49.8 ohms. This is obviously not good, it would cause almost 1 amp to flow through whatever the fault path is.
* There is no evidence of any solder defects visible on U1.