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Using BQ24620 to power load without battery

Abhishek Mathur
Prodigy 60 points
Other Parts Discussed in Thread: BQ24620, BQ24610, BQ24617

I am using the BQ24620 to power a 4 cell battery pack based load. (upto 14.4v). However, I would like the unit to be powered up at a constant voltage even the battery is not detected.(Battery is optional for this application)

Is it possible to modify the circuit to allow this? So far, the way to do this is exceeding CMAX on the load (Equation 8 on page 22 of the datasheet) This comes out to be around 700uF for my circuit. Is there any other way?

  • 0
    TI__Prodigy 260 points

    Hi Abhishek,

    The bq24620 does not provide the feature you are looking for. You would need to trick the charger into believing that there is a battery available by adding capacitance. The problem of max capacitance in the d/s can be avoided by switching this bank of capacitors in and out depending on the presence of a battery pack. Needless to say, you would need to figure out if there is a battery present based on some other technique (the battery detection circuit in the bq24620 would always think there is a battery).
    This seems like an expensive solution because you would need to add enough capacitance to fool the bq24620 into thinking there is a battery connected all the time.

    Update:

    You might want to look into parts with Power Path management (such as bq24610 or bq24617), which allow you to power the system directly from the adapter with no battery. This will NOT regulate the system voltage, it will simply short your adapter voltage to your system.  

    Regards,
    Alvaro