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Original question:

BQ25890 / Floating ILIM pin

BQ25890H: Input current limit of less than 500 mA is not support on ILIM pin.

Dong Shen
Prodigy 400 points
Part Number: BQ25890H

Hi, Team

There is following comment at description of pin function. Could you help to explain what does it mean? Thanks.

Input current limit of less than 500 mA is not support on ILIM pin.

  • 0
    TI__Guru**** 167116 points

    Hi Daniel,

    The ILIM pin resistor sets a maximum input current limit clamp which supercedes the IINDPM register.  In other words, the input current limit is the lower of the IINDPM register or the ILIM pin resistor setting.  However, the ILIM pin resistor cannot be used to clamp the input current limit lower than 500mA.  But the IINPDM register can be set to values below 500mA.

    Regards,

    Jeff

  • 0 in reply to Jeff F
    TI__Prodigy 400 points

    Hi, Jeff

    IINMAX = KILIM/RILIM, KILIM=350 A*Ohm typical, for IINMAX = 500mA, RILIM = 700 Ohm typical. 

    So what will happen if customer sets RILIM > 700 Ohm? 

    Thank you.

  • 0 in reply to Dong Shen
    TI__Guru**** 167116 points

    Hi Daniel,

    When clamped below 500mA using ILIM, the input current could potentially oscillate.  Therefore, we do not recommend such operation.

    Regards,

    Jeff