Lt8613 parallel application

Hi All,

I`m Giacomo. I kindly would know if two or more parallel LT8613 switching regulators could be implemented together for providing higher power and if so, are there any problems with this configuration? Which type of precautions do I have to consider for this topology?

Thank you for your help.

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  • 0
    •  Analog Employees 
    on Feb 9, 2021 11:12 AM

    Hello,

    to parallel two buck regulators you would need direct access to the compensation pin (VC or ITH) which enables accurate current sharing. This is not the case for the LT8613.

    LT8650S offers two outputs which can be paralleled (VC pins accessible). using two two LT8650S to generate one output with 4 phases is doable as well (page 29)

    kind regards

    Markus

  • Hello Markus,

    thanks a lot for your answer. Let`s say that I`m obliged to use an LT8613, so even if there are a lot of other solutions for my application, I cannot use them. Is it possible to add any discrete components in order to allow a good operation of the two parallel LT8613? Moreover, I take this opportunity to ask you if the LT8613 buck converter can be implemented with a coupled inductor or transformer for generating an isolated output voltage. I know that LT8613 is not designed for an isolated output, but, maybe, with your experience, you can tell me if there are any problems with this kind of solution. 

    Thanking you in advance for your help.

    Kind regards

    Giacomo

  • +1
    •  Analog Employees 
    on Feb 11, 2021 7:52 AM in reply to Power_Jack

    Hello,

    to abtain the necessary current sharing you can add this nice part:
    https://www.analog.com/en/products/ltc4370.html
    The LTC4370 takes care for the unavoidable small differences of two DC/DC supplies who should deliver the same nominal output voltage.

    You can use nearly every buck regulator with this approach:
    https://www.youtube.com/watch?v=hyTyl2xoRns

    Yes another large vendor of buck parts is mentioned, but we can 'tolerate' this ;-)

    I have not done it before, so no further inputs to this from me.

    Markus

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