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BQ24133 BATFET turn on

Lucifer
Expert 2600 points
Other Parts Discussed in Thread: BQ24133

Dear sir,

I am coping with the problem of BQ24133 at this moment. for my application, 3Cel (12v) Vin=16v.

when I plug-in the adapter, the vacc=16v, vref=3.3v,Vregn=6v, VSYS=15.56V but the VBAT=15.56v as well ( it should be 12V) . I checked the voltage (Q1414)of  BATFET,  BATGATE =15.56V. once I remove (Q1414)  BATFET, the VBT becomes 12v(correct voltage level ).  is anything wrong? please kindly help me, Thanks.