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Original question:

BQ24166: Powerpath output when battery voltage is at extrmely low (<3.3V)

BQ24165: behaviour with low battery voltage when discharging

Paul Haines
Prodigy 40 points
Part Number: BQ24165

Hello, could you please clarify how the BQ24165 behaves when NOT charging in the event of low battery voltage. Does it isolate SYS from BAT (i.e. turn off Q4) when the Vbat drops below Vbatuvlo? If this is the case, what accuracy and hysteresis is there? The datasheet gives a figure of 2.5V for Vbatuvlo, but I can't see how this is used, and there is no comparator of Vbat and Vbatuvlo on the block diagram. Many thanks.

  • 0
    TI__Guru**** 161861 points

    Hi Paul,

    When charge is disabled (BATFET turned off), SYS is regulated to 4.33V typical regardless of BAT voltage. 

    When charge is enabled and V(BAT)<VMINSYS=3.7V typical, SYS is regulated to 3.7V typical.  There is little hysteresis.

    When charge is enabled and V(BAT)>MINSYS, SYS=VBAT+ICHRG*RDSonBATFET.

    When V(BAT) < 3.0V, charge current is reduced to 50mA.

    When V(BAT)<=2.5V, supplement mode is disabled.

    Datasheet figure 20 on page 14 shows operation when charge is enabled.

    Regards,

    Jeff