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BQ25756: BQ25756

Lynn Smith
Prodigy 20 points
Part Number: BQ25756

Tool/software:

I am incorporating a BQ25756 into a standalone charger only for 4 series 26650 Li-Ion cells, 3.2V, 9.6WH.  Charging set to 2A (ICHG = 24.9k).  Charging on/off controlled via CE line.  Charger is put into low power "dormant" mode by driving ILIM-HIZ to +5V otherwise this pin is tied to ground through a 3.92k resistor.

Issue: the charge current is only a clean DC during part of the final charge, otherwise the charge current appears to be ripple between near 0A and 2A and not a straight DC.

Can this part operate as a standalone charger or am I missing something?  Do I need to setup any registers in order to operate in standalone?  Can the charger be enabled and disabled via the CE line?  If I enable and disable charging using the ILIM-HIZ line, does that change any setup registers?  No matter what I try I can't to get it to give me a DC charge current.

  • 0
    TI__Genius 17230 points

    Hello Lynn,

    When the termination current is set to below 2A, we recommend setting EN_PFM=0. For a standalone application, you can use an EEPROM to do this. Keep in mind that the charger will go back to the default registers if the charger loses power.

    Lynn Smith said:
    Can the charger be enabled and disabled via the CE line?  If I enable and disable charging using the ILIM-HIZ line, does that change any setup registers? 

    Yes, you can control the charger through this line. Changing the ILIM_HIZ voltage does not change any of the setup registers.

    Let me know if that answers your questions.

    Best Regards,
    Ethan Galloway