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LM7310: current monitor pin (Imon) design recommendation

Leo Chow
Expert 3120 points
Part Number: LM7310

Hi,

I have some queries with regards to current monitor pin settings on LM73100 & hope to get some clarification on it.

1. In the LM73100 datasheet, it is strongly requested to ground the Imon pin if not used. Is there any specific reason for this? I did look into datasheet section 7.3.5 for answers but I'm still unsure reason for this design recommendation.

2. Also I did encounter similar issue on eFuse application as well where there was no clear definition of Imon pin setup, will it be the same recommendation applied onto LM73100 as well?

3. What is the backward leakage current at Vout=10V if the IC input is open (OVLO= 0V)?

  • 0
    Intellectual 490 points

    Hi,

    1.See 6.1 Absolute Maximum Ratings. The maximum voltage on IMON pin is 1.8V, so to prevent damage, just connect it to ground to make sure about that.

    2.Which device are you talking about? I'm not an expert on eFuse product line.

    3.Please refer to below picture from the device datasheet.

    Thanks!

  • +1
    TI__Guru 50335 points

    Hi Leo,

    Leaving it open can cause the IMON pin to have a large spike during a short-circuit event and get damaged. It needs to be clamped below 1.8V using an external Zener. Otherwise, it’s best to keep it grounded.

     For eFuses, the OCP/SCP ensure the current is not allowed to build very high and cause the IMON pin voltage to shoot up so for eFuse you can keep it open.

    Regards

    Kunal Goel