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TPS63060 GND and PGND Internal Connection?

Brian Sueppel
Prodigy 55 points
Other Parts Discussed in Thread: TPS63060

There is an error in my PCB layout concerning TPS63060 that leaves Pin 7(GND) open. The PGND pad is connected to system ground. I measure a low resistance from Pin 7(GND) to PGND which I assume the two are connected internally. The circuit functions as expected. Are the grounds internally connected and do you think it is OK not grounding Pin 7 externally? 

  • 0
    TI__Expert 8420 points

    I need to take a look at your layout. Can you please share your layout (each layer separately with the silk screen) and schematic?

  • 0 in reply to Sabrina
    Prodigy 55 points

    Hi Sabrina,


    The layout is identical to Fig 34 of the datasheet except pin 7 (GND) is unconnected and floating.  The circuit works as expected.  Does that mean GND is internally connected to the PowerPad GND and it is OK to have it disconnected?

  • 0 in reply to Brian Sueppel
    TI__Expert 8420 points

    In the TPS63060 the PGND and GND are internally connected, but the connection is weak.

    I would recommend you not to leave the pin 7 floating to have a reliable design. I can help you to review the layout of your circuit. What are your operating conditions? Vin, Vout Iout,  

    What is the end application?

  • 0 in reply to Sabrina
    Prodigy 55 points

    This design is in production and in the field.  Can you give me a reason why this weak connection is not reliable?

  • 0 in reply to Brian Sueppel
    TI__Expert 8420 points
    In my opinion, leaving pin 7 open will not damage the device because you definitely connected the FB divider GND somewhere else, but with a longer trace. Pin 7 is the internal reference GND, if the potential is different from the feedback divider GND it could lead to some inaccuracy in Vout depending on the load and in your end application. I did not review your layout, I don't know how good are the GND connections.
    I can help you with reviewing the schematic and layout.