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BQ25303J: Minimum Charge Current Allowed

Matt Mottier
Prodigy 220 points
Part Number: BQ25303J

For the BQ25303J, is there a minimum charge current that can be set with the external resistor.

For example, if I had a 250mAh battery and I wanted to charge at 125mA (C/2), could I set my resistor to 320kOhms (40k/0.125) to achieve this?  Is there any issues with low charge currents such as this?

Matt Mottier

  • 0
    TI__Mastermind 24075 points

    Hi Matt,

      I would recommend using this part for above 300mA charging. With a switching converter, the accuracy goes down at lower charge currents because it gets harder for the converter to sense such low ripple currents. It isn't feasible to use a switching charger for such a low charge current of 125mA. I would recommend you selecting a linear charger for your application. You can view our portfolio through the parametric search tool on TI.com and selecting the linear topology: www.ti.com/.../overview.html