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BQ25882: current and peak current, output capacitor

Hori Shota
Expert 1470 points

Part Number: BQ25882

Hi team,

For BQ25882, when VBUS is not supplied and current flows from BAT to SYS, could you please provide the maximum current that can be delivered in this state, both for continuous current and peak current?

I have seen in other E2E threads that the maximum discharge current is 5A, but the datasheet states a maximum of 4A. Are these values referring to continuous current?Please clarify the continuous current and peak current specifications.
Also, regarding the output capacitor, the datasheet recommends 44µF, but what is the maximum allowed value?

 

Best Regards,

Shota

  • 0
    TI__Mastermind 43185 points

    Hello Shota,

    Thank you for reaching out. The first question is answered by Section 7.3 of the datasheet. The RMS discharge current is 4A, and the peak is 8A.

    As stated above, the max RMS current is 4A.

    Your battery will have a large equivalent bulk capacitance, this is for ceramic decoupling capacitor near the converter. Please use at least the minimum recommended.

    Regards,

    Mike Emanuel

  • 0 in reply to Michael Emanuel35
    Expert 1470 points

    Hi Mike Emanuel,

    Thank you for your response.

    Regarding the output capacitor, I would like to know the maximum capacitance that guarantees proper operation of the IC, rather than the minimum value. What is the maximum capacitance in farads? The output is connected to a DC-DC converter, and the input capacitor of the DC-DC converter is 0.1 µF.

    Best Regards,

    Shota

  • +1 in reply to Hori Shota
    TI__Mastermind 43185 points

    Hi Shota,

    As said before, you will have a large bulk capacitance from the battery that will drown out the ceramic capacitor. However, the higher the ceramic capacitor, the more inrush current the device may see upon plugin. Please design according to your application. The minimum is the minimum ceramic capacitor needed.

    Regards,

    Mike Emanuel