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TPS62869EVM-118: Is it necessary to separate AGND and PGND with TPS62869?

Jerry Shen
Prodigy 40 points
Part Number: TPS62869EVM-118
Other Parts Discussed in Thread: TPS62869

Tool/software:

Hi Team, 

I noticed that the TPS62869 datasheet does not  recommend separating AGND.
Can I directly connect AGND and PGND, or is a small net-tie trace still necessary?

  • 0
    TI__Guru**** 150650 points

    Hi,

    A net tie is one method of organizing the various GNDs to connect them properly in the PCB layout.  It is the layout that ultimately matters, not the schematic.

    For this IC, the PGND and AGND pins are right next to each other, so this makes an excellent point for a star/common GND.  As well, the only small-signal component which should connect to AGND would be the VSET resistor, which should be located immediately adjacent to the AGND and VSET pins.

    So no, it is not necessary to use a net tie with this IC's GNDs.

    Thanks,

    Chris