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TPS737: N/C Pin Connection

KevinZhang123
Expert 5750 points
Part Number: TPS737

Hi, Team

My car infotainment customer want to make a compatible PCB design for both TPS73701DRB and TPS7A8101QDRB in their infotainment products.

So TPS737301 pin 2 (N/C) need to connect to pin 1 (OUT), and pin 7 (N/C) need to connect to pin 8 (IN). Is it OK to do that?

Thanks

Kevin

  • 0
    TI__Guru 55940 points
    Hi Kevin,

    The NC pins are not internally connected to the device, as such, you can connect these pins to any net for your application convenience. I did notice that your stated part numbers are not the automotive qualified part numbers for these families. Please note that both devices do have automotive qualified versions.

    Very Respectfully,
    Ryan
  • 0 in reply to Ryan Eslinger
    TI__Expert 3115 points

    From a thermal perspective I was think it would be better to connect these pins to the ground plane, correct?

    Thanks,

    Regards,

    Joe

  • 0 in reply to Joe DiBartolomeo
    TI__Guru 55940 points
    Hi Joe,

    Yes from a thermal perspective it is important to maximize the GND plane local to the LDO because the GND plane is the primary heatsink for the LDO. As such, from a thermal perspective it would be better to tie the NC pins to GND.

    Perhaps I misunderstood the original question, but my understand was that the layout needed to work for multiple regulators for this application. One of the regulators required the connections shown in the first post image. As the NC pins are not internally connected, it is possible to use the TPS737 as shown.

    Very Respectfully,
    Ryan