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LTC3601 switching reg issue


We are testing 5 sets of PCB containing 2 LTC3601EMSE ICs each.

One of them seems burn out during out long term test.
The test was signaling to pin 12(RUN, 3.3V) 6-hour on-and-off every 3 sec.

It was hot and output 0V when it was out-of-order.

Note that pin 6 (INTVCC) output 5V when it comes to out-of-order. It should out 3.3V.

I want to get advised relating our schematics in terms of safty and protection.



edited title
[edited by: JValeriani at 7:18 PM (GMT 0) on 8 Jul 2019]