Post Go back to editing

ADuM4223 Internal structure

Hi,

I would like to use ADuM4223.

So, I have a question. Please help me.

Question:

I am experimenting with ADuM4223.

In this situation, the phenomenon that the IC that supplies power to the ADuM4223 broke down (supplying power to VDDA and VDDB) occurred.

We are investigating the internal structure of ADuM4223 to investigate the cause.

For example, do you have CMOS inside?
We consider the possibility of power supply short circuit when a negative bias is applied to the pin.

I would like to know if there are other possible causes.
The ADuM4223 was not out of order.

Best Regards,

Naohisa

  • Hello, everyone.

    Could you answer my question?
    It's very troubled.

    Thank you for your consideration.

    Best Regards,

    Naohisa

  • Hello,

    Sorry for the late reply, I just returned from the year end break.

    The ADuM4223 is comprised of 3 separate silicon dice. One silicon die connects to pins 1-8, the second die is pins 9-11, and the third is 14-16. Each of these die are CMOS process silicon. Each power rail ("VDD1 to GND1", "VDDA to GNDA", and "VDDB to GNDB") power a separate silicon die of the part. As this part is isolated with iCoupler technology, each silicon region can be placed at different voltage potentials as long as the isolation constraints are met.

    One thing to consider is that if the power rails are given a negative voltage, body diodes will conduct, and the part can suffer damage. This is shown in the datasheet in the abs. max table.

    VDD1 to GND1 must not go below -0.5 V.

    VDDA to GNDA must not go below -0.5 V.

    VDDB to GNDB must not go below -0.5 V.

    The individual regions may have hundreds of volts between them without issue.

    Do you have a schematic that is shareable?

    What is the possible source of negative voltage on the part?

    When the issue shows up, which pins are shorted?

    RSchnell