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BQ25505: Maximum Input Current and Power

Art Mecina
Genius 16655 points
Part Number: BQ25505

Hello Guys,

Good day.

Our customer is asking about the maximum input current of BQ25505. I can’t seem to find it on the datasheet.
But the maximum input power of 510mW and maximum input voltage of 5.5V were provided under Absolute Maximum Ratings on the datasheet. Using these values, is it safe to provide ~100mA to the customer?

In addition, if the input has more power available than the chip can handle, will the chip automatically limit the power and current coming in?

Thanks to confirm.

Art

  • 0
    TI__Guru**** 166576 points

    Hi Art,

    The BQ25505 operates in DCM with the inductor current going from 0 to the cycle by cycle current limit of 230mA typical, 285mA max.  If the solar panel consistently provides power and the MPP circuit regulates the input voltage to VMPP, the maximum average input is 50% of the 230mA=115mA.  The cycle by cycle current automatically limits the input power.

    The BQ25505 is a boost charger so VBAT_OV must be set higher than the MPP voltage.

    Regards,

    Jeff

  • 0 in reply to Jeff F
    TI__Genius 16655 points

    Hi Jeff,

    Thank you very much for the detailed response!

    Art