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BQ24780S: Bonding Wire Fusing

Kenyo Tobita
Prodigy 20 points
Part Number: BQ24780S

Tool/software:

The battery charger BQ24780S is applied in our products. 

Attached file is a photo of defective BQ24780S in our PCB returned from customer.

Wire of #2pin is fused.

Please teach me the possible cause of failure.

BQ24780SRUYR_BondingWireFusing.xlsx

Thanks,

Kenyo Tobita

Fujikura Ltd.