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LM2852: Question regarding SGND in this LM2852

Jay Lee
Prodigy 10 points
Part Number: LM2852

Hi, since I am very new to this field, my question may be very trivial.

In this part, there are 2 ground pins (PGND, SGND).

As I read it, I am a bit confused about this ground.

The typical application schematic of this part shows an example connection of this part with external passive components and ground.

However, I have difficulty distinguishing ground. Which ground is SGND or PGND?

Also, could you please let me know if I have to distinguish two grounds? Is it possible to connect them together?

Thank you in advance for your help!

  • 0
    TI__Genius 17350 points

    Hi Jay,

    The PGND is the ground to be used for the power FETs and the SGND is the ground that is used by the AVIN pin and internal control circuits. Figure 1 on page 3 of the EVM-User Guide shows how to connect the PGND and SGND. Both are connected to the thermal pad.

    The PGND typically has a lot of noise from the switching currents it carries. It is important this current doesn't flow through the SGND to keep it noise free - so that the internal circuits are not affected.

    Best regards,

    Varun