Trying to track down a problem involving 2 BQ25896RTWRs on two separate boards (out of 50-100 produced).
Both ICs have literally smoked, as shown in picture.
Prior to smoking, a "clicking" noise was heard coming from battery charge circuit, presumably the inductor.
At the time, the charge circuit was being used to charge an on board Li-Ion 5000mah battery ... as well as a Samsung S23 phone that was in a very dead state.
In fact, several phones had been charged from this dead state, one at a time.
When charging the 5th phone, a faint high pitched whining started.
Stopped the process for 2 days then started with charging the 6th phone and heard the clicking noise when connected. It persisted for about 5 minutes before smoke.
Again, we have had this failure on one other board which we returned to our assembly house to have replaced. After replacing it has worked fine, as far as I know.
Scratching my head on this one ...
Bill
