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BQ24100: IC getting damaged when battery (cell) is mounted to the end device

Expert 6370 points
Part Number: BQ24100

Team,

in our application with bq24100 (single 18650 cell), it sometimes occurs that both the IC itself and also the output current sense resistor (100mOhm) are getting damaged in the moment when the battery (cell) is being soldered to the PCB. This happened already a few times on the production (initial batch production).

It seems that in the moment when the battery is mounted (and there's no power from the line) the bottom transistor of the integrated buck converter turns on and it causes the damages. 

In our case, the order in which the boards are initially turned on and when the battery cell is mounted can be random.

Thanks for your advice.

Kind regards
TI Customer