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BQ25629: Is the system output regulated when the device is running on battery?

Abbas Mehdi
Intellectual 580 points
Part Number: BQ25629


Hi there.

Looking at the block diagram in the datasheet, it is evident that the buck converter works only when the system is being powered by an external source (VBus) and not when it is being powered from the battery. Can you please confirm this? Would this require an additional buck converter to be added to the system output of this charging IC to ensure that the end system always receives a regulated supply? If so, then this makes this charging IC unfit for the applications mentioned on the first page of the datasheet.

  • 0
    TI__Guru 59501 points

    Hi,

    For charging mode, yes.  9.3.4.1 Narrow VDC Architecture only applies when valid VBUS source is present.

    For boost mode, the converter also switches to support boost output from VBAT.

    If only the battery is present and the VBAT is above depletion threshold (VBAT_UVLOZ), the BATFET is on to connect the battery to system. VSYS follows VBAT with the difference of BATFET voltage drop.

    Thanks,

    Ning.

  • 0 in reply to Ning T
    Intellectual 580 points

    Hmm. I thought so!

    I am slightly disappointed since it was a nice charging IC.

    I am looking for a part that offers buck operation on one line and boost operation on another line, both simultaneously while powered by a battery. The charging is expected through a 5V supply (USB), which can either be a buck or a linear operation. Would you like to suggest a part having similar capabilities?

  • 0 in reply to Abbas Mehdi
    TI__Guru 59501 points

    Hi,

    Please submit a new e2e inquiry for the charger suggestion to see if other teams have similar part.

    Thanks,

    Ning.