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LMR36015-Q1: LMR36015FSCQRNXRQ1 : Iq

BJ Han
Expert 2035 points
Part Number: LMR36015-Q1

Dear TI,

I am using LMR36015FSCQRNXRQ1 to test.
I have a problem with the test and I would like to ask for help.
When in sleep mode, the leakage current of the part is generated considerably. (㎃)

What is the Iq value of this product?
Only PFM variant only is indicated on the datasheet.

The current circuit design is shown below.

Please review and let us have your feedback soon.

If you have any question, please feel free to contact me.

 

Thank you.

  • 0
    TI__Expert 4555 points

    Hello BJ Han,

    I understand your question.

    LMR36015FSCQRNXRQ1 is FPWM variant and we do expect relatively large quiescent current proablably in the range of few miliamps particularly when you are running the part in high frequency range.

    Can you please let me know what VIN and load your are testing this product?

    Can you please tell me more about your application case, just trying to understand what is more important fixed frequency operation or low quiescent current for your application.

    Best Regards,

    Ankit Gupta

    Application Engineer, Power Solutions

  • 0 in reply to Ankit Gupta95
    Expert 2035 points

    Dear Ankit Gupta,

    Thank you for your attention and support.

    Below is a brief project information.

    ▶Application : PTC Heater
    ▶Device : LMR36015FSCQRNXRQ1
    -. Vin (Min, Typ , Max) :  29V
    -. Vout : 12V
    -. Iout (Min, Typ , Max) : 500㎂ / 400㎃ / 1A
    -. Application : Commercial vehicles Smart Junction box

    For your reference, the data sheet says:
    Isn't it all PFM supported now?


    If parts need to be changed, we recommend you to recommend Step down converter.

     

  • 0 in reply to BJ Han
    TI__Expert 4555 points

    Hello BJ Han,

    The Variant that you are using is LMR36015FSCQRNXRQ1 which is a FPWM option, which is a factory option made available for cases when constant frequency operation is more important than light load efficiency, and to have better control on EMI. You cannot have PFM and FPWM (which is CCM operation in light load) at same time. Please refer to Page 17 in datasheet., attaching screenshot below:

    PS:

    It depends on your application, If you want constant frequency option you can go ahead with the variant that you have right now but if you are concerned about light load efficeincy and low quiscent current you can opt for the Variant which has FPWM option disabled (which means an AUTO mode operation). You can choose any variants of same part from screenshot attached below, or you can always visit our Webench design tool to choose the best part for your application.

    Please close the thread if you think my response answered your question. Thanks!

    Best Regards,

    Ankit Gupta 

    Application Engineer