BQ24259: Confirm ISYS problem

Terry Tseng

Expert 1075 points

Part Number: BQ24259

Dear TI sir

BQ24259 Isys show 3.5A. Dose it mean BATFET Q4 ?

over 7 years ago

0 Jeff F over 7 years ago

TI__Guru**** 165886 points

Hi Terry,

ISYS is the maximum output current (to system and battery) from the buck converter (Q2, Q3 and inductor). IBAT discharging (5.5A) is the maximum current out of the battery.

0 Terry Tseng over 7 years ago in reply to Jeff F

Expert 1075 points

Hi Sir
IBAT 5.5A means Q4 ?

0 Jeff F over 7 years ago in reply to Terry Tseng

TI__Guru**** 165886 points

Yes, Q4 is the BATFET with battery charge current flowing into the battery and discharge current flowing out of the battery from/to SYS.

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BQ24259: Confirm ISYS problem