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Using bq24650 as system supply

David Petticord
Prodigy 100 points
Other Parts Discussed in Thread: BQ24650

I am designing a system that intermittently draws around two amps from a 3.3v LiFePo4 battery.

The system has a solar panel attached in order to charge the battery.

The solar panel may or may not have sufficient power to power the system.

For other BQ241xx Battery Charger ICs , TI indicates that system power can be tapped from the "up side" of the current sense resistor.

In the bq24650, that point is connected to the SRP pin.

Do you see a problem with using the bq24650 in this fashion?

Thank you

 

  • 0
    TI__Guru 56650 points

    bq241xx is an average current control IC. But, bq246xx is a cycle-by-cycle current control IC. If put a system load and system cap on SRP, the bq246xx can not sense the inductor current very well. It will affect the peak current protection and inductor under current protection.

  • 0
    TI__Guru 56650 points

    bq241xx is an average current control IC. But, bq246xx is a cycle-by-cycle current control IC. If put a system load and system cap on SRP, the bq246xx can not sense the inductor current very well. It will affect the peak current protection and inductor under current protection.

  • 0 in reply to Wang5577
    Prodigy 100 points

    Thank you for your reply, Wang.

    What you said makes sense.

    I guess the default is to switch the battery between powering the system and getting charged.