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I am using Microchip SOM module in my project. Not using all the things in the SOM.

So we are redesigning the board with necessary components for my application.

Below is block diagram shows the main power flow. Output from PMIC1 (MIC23451) is connected to PMIC2 (MIC2800).

The input voltage range of PMIC1 is 2.7 to 5.5 V and in my board a 3.8 V 5 A rail is free.

As per my knowledge I can use the 3.8 V 5 A rail as an input for PMIC1.

In the reference design (page 12) PMIC1 is powered with a 5 V.

May I know can I go ahead with 3.8 V input for PMIC1?

enter image description here

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  • \$\begingroup\$ Why wouldn’t you be? Where lies your doubts? \$\endgroup\$
    – winny
    Commented May 29, 2023 at 7:00
  • \$\begingroup\$ No doubts. As per my understanding I can run it on 3.8V 5A,but just double confirming from experts whether I can run at 3.8V 5A input or not.May I know your thoughts \$\endgroup\$
    – Confused
    Commented May 29, 2023 at 7:03
  • \$\begingroup\$ As long as the logic levels are the same as the supply... But 3.8V is a weird one, you might end up with a lot of extra buffers just to translate the logic levels to 3.3V/5V. \$\endgroup\$
    – Lundin
    Commented May 29, 2023 at 7:50
  • \$\begingroup\$ Why does it say 180R below the coils, is it ESR? What are those for anyway, are they actually ferrites or such? \$\endgroup\$
    – Lundin
    Commented May 29, 2023 at 7:53
  • \$\begingroup\$ @Lundin,the main IC(SAMA5D27C-D1G-CU) is working at 3.3V rail \$\endgroup\$
    – Confused
    Commented May 29, 2023 at 8:10

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