03-23-2021 08:43 AM
I see that UG583 (PCB Design) show max current for VCCINT.
I also see that DS925 (DC& AC Switching Characteristics) show max current for I_DC and I_RMS = 20mA [For I/O's]
I'm trying to find what spec mentions the max current for the power pins and can't find it.
03-24-2021 01:56 PM
There is no such manual. We expect the current to be driven roughly equally divided between each of the supply balls otherwise that defeats the purpose of power delivery and integrity. So in your case for the ZU4G_FBVB with 29 VCCINT balls that would be 52A/29Balls = ~1.8A max per ball.
03-24-2021 02:11 PM
I know somebody mentioned in one of your previous posts that you will need a robust thermal solution if you are using anywhere near 52 amps of Vccint. You might also want to consider using more than one plane to deliver the Vccint. All of the vias in a big package will break up the plane. At that power draw, I wouldn't be surprised of the inner Vccint pins could be seeing a lower voltage.