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BQ24600: Current Path Implementation

Iker Del Campo Merlos
Prodigy 10 points
Part Number: BQ24600
Other Parts Discussed in Thread: BQ25306, BQ24610

Tool/software:

Hi everyone,

I am planning to use the BQ24600 to charge a 4-cell Li-Ion battery pack at 14.4–14.8V. To power the system load, we plan to use a buck converter to step down this voltage to 12V.

I already know that many other TI chargers, such as the BQ25306RTER, include a VSYS pin to provide a direct current path from the adapter to the system load, bypassing the battery. However, I noticed that the BQ24600 does not have such a feature. How could I implement a similar current path with this IC?

Any advice would be highly appreciated!

Thanks in advance.

  • 0
    TI__Guru**** 152756 points

    HI Iker,

    The circuit from BQ25306 datasheet works here too with VSYS connected to cathode of D2 above.  

    Or you can move to BQ24610 which has the additional drive pins for better soft start and smoother hand off from battery to input source and vice versa:

    Regards,

    Jeff

  • 0 in reply to Jeff F
    Prodigy 10 points

    Hello Jeff,

    I really appreciate your support and the suggestions.

    We’ve decided to proceed with the BQ24610 for our design. We understand that this IC can be configured to supply power directly from the input source when the adapter is connected and switch to the battery when the adapter is not available. However, we would like to clarify whether the power provided by the IC when the adapter is connected is the same as the input voltage or the battery charging voltage.

    To elaborate, we are planning to charge a 4S Li-Ion battery (14.4V) using a 24V input. We also need a 12V output that can be supplied either by the adapter or the battery, depending on whether the adapter is connected. Could you please confirm the best way to implement this behavior (see the schematic attached for reference)?

    Best,
    Iker

  • 0 in reply to Iker Del Campo Merlos
    TI__Guru** 103795 points

    Hello,

    Due to the U.S. holiday our responses will be delayed, sorry for the inconvenience.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Iker Del Campo Merlos
    TI__Guru**** 152756 points

    Hi Iker,

    The system voltage is the input power voltage not the battery voltage. Your block diagram is what I recommend, adding a dc/dc converter after the charger.

    Regards,

    Jeff

    Regards,

    Jeff

  • 0 in reply to Jeff F
    Prodigy 10 points

    Perfect, thank you so much Jeff!