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BQ25504: BQ25504 charger

Part Number: BQ25504

Dear Sir,

 I am using BQ25504 pv harvester as our charger and the specification is Vin=1.7V Iin=200mA, Vstor=VBAT=4.2V, UV=2.7V, OV=4.2V.

 So far we have 10kts sample boards, all the condition are the same. 5 kits function are good which Vstor=4.2v. the other 5 kits are malfunction which Vstor=1.6V. it can't be boosted to 4.2V.

 After checking the Vin , it dropped to 0.6V.  is there any thing wrong? may give me some suggestion? Thanks.