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BQ25303J: Circuit configuration of the BQ25303

kob
Prodigy 140 points
Part Number: BQ25303J

Tool/software:

Hi,
Let me confirm something in relation to sagar m's inquiry from over two years ago.
From the attached circuit diagram, the BQ25303 appears to be configured as Figure 10-1 on the datasheet, that is, a circuit for a standalone charger with no external power path.
However, the BAT-IN terminal to which the battery is connected is connected to the input of a power supply such as 3.3V, so taking this into consideration, it seems better to follow Figure 10-7 on the datasheet.
If it is not used as a standalone charger and it is also necessary to discharge the battery to other circuits, is it correct to understand that Figure 10-1 on the datasheet is fine?
Of course, I understand that when charging the battery while supplying power to other circuits, it is not possible to supply more power than the charging current set by the BQ25303.
Are there any other problems?
In particular, I am wondering whether there will be any problems when switching between the presence and absence of VBUS.
Regards,

  • 0
    TI__Guru 57541 points

    Hi,

    Please follow Figure 10-1. Typical Application Diagram.

    Thanks,

    Ning

  • 0 in reply to Ning T
    Prodigy 140 points

    Hi,
    Thank you for your answer.
    I understood that even with the configuration in Figure 10-1, VSYS can be supplied directly from the BAT of the BQ25303.
    Is it correct to understand that the configuration in Figure 10-7 is appropriate when the current supplied to the VSYS side is large?

    This changes the content, but please let me confirm it.
    How is the charging current controlled in the CV charging range?
    Does the BQ25303 control the charging current according to the BAT voltage value?
    Does the BQ25303 simply follow the gradual decrease in the current to the battery by fixing the charging voltage?
    Regards,

  • 0 in reply to kob
    TI__Guru 57541 points

    Hi,

    No, it's not.

    In CV mode, the charge current depends on the BAT pin voltage.

    Thanks,

    Ning.