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TPS62730: Do not see expected voltage (2.1V) at output

Tushar Bhattacharyya2
Intellectual 825 points
Part Number: TPS62730
Other Parts Discussed in Thread: CC2640

Hi I am using the TPS62730 to step down from 3V to 2.1V in an effort to reduce current consumption while powering my CC2640 and a few sensors.

The circuit for TPS62730 that I am using is below:

So, ideally I would expect 2.1V at LDO_OUT_2p1 but I am getting 0.85V. I am not able to understand why. Can someone please help me understand?

Thanks.

  • 0
    TI__Expert 8420 points

    Hi Tushar,

    Could you share the layout and a picture of your measurement setup?

    what is the load profile at the output of the DCDC converter?

    Regards

    Sabrina

  • 0 in reply to Sabrina
    Intellectual 825 points

    Hi Sabrina

    Below is the picture of the section of layout we are dealing with. Did you want the actual files?

    Below is a picture of my setup albeit modified (I have been experimenting)

    The output of the converter sees a load of 2.6uF

  • 0 in reply to Tushar Bhattacharyya2
    TI__Expert 8420 points

    Hi Tushar,

    It is critical to have a good layout to ensure a reliable operation of the DCDC converter. On your current layout the input and output capacitors are placed too far away, please place them as close as possible to the IC you have a big loop that adds parasitic inductance to the circuit.The resistor can be placed further away to the IC. 

    I would strongly recommend to modify the layout of the DCDC converter and follow the recommendation of the datasheet shown on section 12.2. this is most probably the reason of a bad output regulation

    By the way, I did not understand how much current is drawn at the output of the converter

    please feel free to post the layout after reworking it for reviewing it.

    Regards

    Sabrina