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BQ25616: No Battery condition

Revanth A1
Intellectual 300 points
Part Number: BQ25616

Hi, 

Iam planning to use BQ25616 battery management IC in my design with input volatge 5 - 12V at 2A, In my design sometimes there wont be battery available but input power supply will be there in that case will I get output from the SYS Pin? what will be the voltage i will be getting as output if battery is not there?

  • 0
    TI__Mastermind 24075 points

    Hi Revanth,

       When there is no battery connected AND charge is enabled, the device tries to regulate VBAT to charging voltage (VREG) then terminate. After certain time, VBAT may drop below recharge threshold and the device charges VBAT to charging voltage again. So the charger status switches between charging in progress and charging complete and STAT pin blinks. As battery is absent, the output capacitor is being charged, so the cyclic transition is a function of recharge and termination deglitch timers, as the small output capacitance will charge quickly compared to a real battery. 

    Section 9.3.6.1 Narrow VDC Architecture describes behavior of VSYS w.r.t VBAT. As VBAT (when battery is floating) is around the VREG voltage (> VSYSMIN) BATFET is fully on and the voltage difference between the system and battery is the VDS of the BATFET, so VSYS will also track VBAT as VBAT behavior is described above.