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Original question:

BQ24160A: system functions for dual supply

BQ24160A: About the SYS voltage

Liu Yang
Expert 5945 points
Part Number: BQ24160A

Hi Team,

Please help me answer the follow question, thank you so much.

The typical value at the time of Battery FET turned off of VSYS(REG) is described in datesheet, but when the FET is off, does min (VBATREG + 1.5%) means min 3.5 V +1.5%?
Could you tell me the difference between VSYS(REG) and VMINSYS?
Is VSYS(REG) the typical value when the Isys max is 3A on the load of SYS side?
The SYS side is also branched to battery charge and discharge, but is Isys max 3A the sum of SYS side load and battery?
Could you tell me the relationship (distribution?) of the current charge/discharge between the load on the SYS side and the battery?


Best Regards,
Tom.Liu

  • 0
    TI__Guru*** 148655 points

    Hi Liu,

    The SYS output is the output of the buck converter.  Any system load attached at SYS is in parallel with the battery at BAT so the 3-A max buck converter output is split between the loads with the system taking priority.  The battery FET can be prevent charge current going into the battery but cannot be turned off to prevent discharge current as needed to supplement the load.  When charge is disabled/terminated, V(SYS) = VBATREG register value + 3.0% typical.  When charge is active, V(BAT)<MINSYS and no DPM loop is active, V(SYS) = 3.7V typical.  When charge is active, V(BAT)<MINSYS and DPM loop is active, V(SYS) = 3.5V typical.   When V(BAT)<MINSYS, the battery FET linearly regulates the charge current into the battery.

    Regards,

    Jeff