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BQ25886: Could you review schematic for BQ25886?

Downey Kim
Expert 2675 points
Part Number: BQ25886

Hi TI expert,

We designed the circuit by referring to the BQ25886EVM. I want to limit the input current 3A by applying the Input Current Optimizer (ICO). (short D+ to D-)

The charging current is set to 1.5A.

Could you review schematic for BQ25886?

(BQ25886)EMSONIC_0120.pdf

Thanks!

Downey Kim.

  • 0
    TI__Guru*** 143980 points

    Hi Downey,

    A few notes on the schematic:

    1. REGN capacitor minimum is 4.7uF, preferably 16V rated to account for DC bias effects.

    2. Minimum recommended capacitance on SYS is 44uF so that is two 22uF in parallel, also at least 16V rated for DC bias effects.

    3. I recommend adding at least a footprint for the additional, labelled optional in the datasheet, capacitance on PMID.  This device is sensitive to input line impedance and so needs additional capacitance to mitigate the inductance.  Additional capacitance on VBUS is also recommended.  These capacitors need to be placed as close as possible between IC PMID and GND pins.

    4.  /CE pin resistor to ground is shown as NC.  It should be 0ohm if you want the charger to operate in charge mode all the time.

    Regards,

    Jeff