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[FAQ] TPS63001: Current Consumption issue without connecting load

Prodigy 170 points

Replies: 9

Views: 585

Part Number: TPS63001

Hi all,

    Currently we are using TPS63001 fixed 3.3V output DC-DC Converter. As per the TPS63001 DC-DC converter datasheet, module taking Quiescent current (Iq) is less than 50uA. This quiescent current is applicable for without load?. In my design the module is taking 6mA current without connecting load. This 6mA current taking the module is correct for the without load?. If it is correct, can you please suggest me alternative Buck/Boost DC-DC converter for same footprint. I have attached the reference circuit also, this circuit i took it from datasheet.

Thanks

Yusuf Siddik S

  • Hello Yusuf,

    In the above schematic, the PS/SYNC pin is connected to VIN. If this is the case, the device is not allowed to go into power save mode. This means the converter needs to switch with a fixed frequency hence dissipates more power causing higher input current.

    Please connect the PS/SYNC pin to GND and check if the converter then works as you expect it.

    In addition these app notes might be interesting according to your question:

    IQ: What it is, what it isn’t, and how to use it

    Performing Accurate PFM Mode Efficiency Measurements

    Best regards,
    Brigitte

    For more information on buck-boost devices have a look at www.ti.com/buckboost

  • In reply to Brigitte:

    Hi Brigitte,

        Thanks for your reply. I will check.

    Thanks

    Yusuf Siddik S

  • In reply to Brigitte:

    Still i have the same issue. Please let me know the
    any other different DC-DC converter with low current consumption.
  • In reply to yusufs siddik:

    Hello Yusuf,

    Please explain what you mean with "I have the same issue"? If you connect PS/SYNC to GND, the input current with no load attached should reduce.

    If you still observe a high power consumption, it is possible that the power dissipation in the used inductor is causing higher current than expected.

    The lowest quiescent current we have in our portfolio is TPS63802.

    Best regards,
    Brigitte

    For more information on buck-boost devices have a look at www.ti.com/buckboost

  • In reply to Brigitte:

    Hi Brigitte,

           Sorry for the delay. I was ordered TPS63000 Evaluation board. From this eval board i got the Iq is 50uA as per the data sheet without load connection. Same circuit i was used in my own board, i got the Iq is 1mA without connecting load. One thing is tps63000 evaluation board they are used LPS3015-222ML (coil craft) inductor. But this coil craft inductor is not available in digikey and mouser. Can you please suggest alternate 2.2uH inductor available in mouser and digikey. Currently we have using below the inductor. This inductor is correct one? Or can I change any other inductor?

  • In reply to yusufs siddik:

    Hi Yusuf,

    The inductor you are using now should be fine. You can find the guideline for choosing the inductor in theTPS63000 datasheet, section 8.2.2.2 Inductor Selection. Another recommended inductor that is available on Digikey is NR3015T2R2M.

    Check for any differences between your design and the EVM, especially the PCB layout. Be also careful when soldering the inductor, excessive heat can damage it permanently. If you are following the recommendations for the layout and the component sizing, the result you get with your circuit should be the same as for the EVM.

    Best regards,
    Milos

    ti.com/buckboost

  • In reply to yusufs siddik:

    Hi Yusuf,

    We haven’t heard back so we're assuming this resolves your issue. If not, just post a reply below, or create a new thread if the thread has locked due to time-out.

    Thanks and regards,
    Milos

    ti.com/buckboost

  • In reply to Milos:

    Hi Milos,

          Issue resolved ☺️. Thanks for your support.

    Thanks

    Yusuf Siddik S

  • In reply to yusufs siddik:

    Thanks Yusuf,

    Then I will close this thread.

    Best regards,
    Milos

    ti.com/buckboost