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TPS63070: Forgot resistor on enable pin

Bernd Brot
Prodigy 50 points
Part Number: TPS63070

Hello.

I recently finished a design using the TPS63070 regulator. Unfortunately I forgot to add the resistor on the enable pin and tied it directly to the input. Do I have to expect any problems with my design?

Best regards

  • 0
    TI__Intellectual 1700 points

    Hi Bernd,


    Thank you for using our device!

    Can you please share your schematic?

    regards,

    Moritz

  • 0 in reply to Moritz.
    Prodigy 50 points

    Hello,

    thanks for the fast reply. Unfortunately I don't have access to my CAD files at the moment, so I have to come back here tomorrow, butI can provide a picture of the regulator pcb layout.

  • 0 in reply to Bernd Brot
    Prodigy 50 points

    its a 4-layer pcb with dedicated ground and power planes.

  • 0 in reply to Bernd Brot
    Prodigy 50 points

    As it turned aout, I won't be able to upload the schematic in the next days, I reuploaded the picture from above and added all the additional information that could have been found in the schematic, hope this helps. 

    Regarding the PCB layout: I was restrcited in terms of minimal drill diameter, which prevented me from adding additional vias near the PGND pin and making the fancy connection to the inductor as can be seen in the EVM board layout. Further more, the manufacturer of the inductor recommends to keep the area between the terminals free from any ground poor. So I tried to make a proper PGND connection using a copper pour covering the VSEL, FB2 and PS/S pins, which needed to be grounded anyways. In order to keep GND offset low I connected the AGND and PGND directly on the GND pin of the device, To be honest, I'm not sure if this is a reasonable approach. Any advice would be highly appreciated.

    Best regards

  • 0 in reply to Bernd Brot
    TI__Intellectual 1700 points

    The EN-Pin can be sensitive to high-frequency glitches. therefore the 10k resistor is recommended. You have, however, the 10uF input cap between VIN and GND and very close to the device, so you should be fine.

    Your layout looks ok to me, the GND connections are reasonable, the 10uF CIN/COUT are very close to the device and the traces are short.

    Best Regards,

    Moritz

  • 0 in reply to Moritz.
    Prodigy 50 points

    Hello Moritz,

    thank you for the reply. I will proceed and populate a board to see if everything works as expected.

    Have a nice day!