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ADP2302ARDZ-5 burns in unclear circumstances

Question asked by dim.nvt on Dec 30, 2015
Latest reply on Jan 7, 2016 by hyao

Hello all,


Here is the thing. On one of recent projects there are few pieces returned with burned ADP2302 voltage regulator (about 10 from 500 shipped). We're trying to investigate the root cause but still unable to reproduce it. All chips show physical/thermal damage going from inside, please see attached picture.

Components used with ADP2302, see attached schematic:

B330B as catch diode

VLF10040T-6R8N4R5 as power inductor

C3225X7R1C226M x2 as output capacitors

C3216X7R1E106M as input capacitor

GRM188R71E104KA01D on BST line

Any input will be greatly appreciated!