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BQ24074: Solar Panel Charger with >1.6A Input Current

Rob Frizzell
Prodigy 50 points
Part Number: BQ24074

Tool/software:

We're looking at using a solar panel as the input source and it may provide 2A or more.  We want the panel to be able to provide full system power and possibly charge on cloudy days.  We see the 1.6A max input current spec for the device.  Do you have any recommendations for current limiting to use with the BQ24074?  Goal is to use a single LiPo battery (18650 or similar) and our system can draw ~400mA at 5V.

  • 0
    TI__Mastermind 26385 points

    Hi Rob, 

    Thank you for reaching out via E2E. The BQ24074 will not attempt to draw more current than 1.6A max. Additional current limiting shouldn't be necessary for situation where solar panel is capable of providing > 1.6A. 

    Although on the other hand I recommend you consider how you will handle the situation of a weak solar panel (cloudy day, sun setting, etc). For that situation you ideally want to lower the current and input voltage limit on the BQ24074 so charger IC does not attempt to draw more current than the solar panel can provide. 

    Rob Frizzell said:
    our system can draw ~400mA at 5V.

    For your information system output (OUT pin) of BQ24074 is regulated to 4.4V not 5V. 

    Best Regards,

    Garrett