Working with microchip MCP73831T chip to charge a single LiPo cell. We are producing by the 1000 unit and getting significant failure of the charger IC. I suspect we need ESD protection on the 5V for hotswap events, or maybe backfeed somehow from the L1 inductor hurting the IC? Does anyone have any clue what could be wrong with my circuit below?
Not sure what that guy meant by non legible.
Product is failing on customers, after 1-3 months of repeated usage. Maybe 5-10% unit failure rate.
USB plug/unplug to charge an 18650 LiIon cell, 2000mAH, at 500mAH per the charger spec sheet. Symptom would be charger IC no longer lights up status LED and does not charge battery or output voltage. Replace IC and works OK again.
If unable to figure out, maybe just dump microchip brand charger for a comparable texas instruments...