Need help with QFN packaged IC for breadboard

Discussion in 'Electronic Projects' started by Hk316, Nov 14, 2017 at 5:36 PM.

  1. Hk316

    Hk316

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    I am currently working on a solar MPPT charger using LT8490 ic from Linear technology that comes in 64lead QFN package.

    I would like to implement this IC on a stripboard/veroboard but since its QFN package and also has an odd shape, I have been unable to find the correct socket for this type of IC.

    If anyone has any sort of input on how to go about this, please let me know ASAP!

    The IC chosen for this project :
    http://www.linear.com/product/LT8490?full=1

    Thanks in advance
     
    Hk316, Nov 14, 2017 at 5:36 PM
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  2. Hk316

    kellys_eye

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    kellys_eye, Nov 14, 2017 at 6:45 PM
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  3. Hk316

    Hk316

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    Thanks for the swift reply,

    But I don't think the ic will fit this board.

    The dimension for the ic is 7mmx11mm
     
    Hk316, Nov 15, 2017 at 1:34 AM
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  4. Hk316

    Hk316

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    Hk316, Nov 15, 2017 at 1:47 AM
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  5. Hk316

    Hk316

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    Also could you clarify what the 0.5pitch is referring to?
     
    Hk316, Nov 15, 2017 at 1:50 AM
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  6. Hk316

    kellys_eye

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    Inter-pin distance
     
    kellys_eye, Nov 15, 2017 at 12:01 PM
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  7. Hk316

    kellys_eye

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    It's not 'really' a QFN package you've got then, is it......?

    According to the document you link to it's actually a 'UKJ-type' package (with QFN pin spacing) which looks as if it will require a custom PCB to accommodate.

    Getting a PCB made for it will be an order of magnitude (or two!) cheaper than finding a socket, I can assure you!
     
    kellys_eye, Nov 15, 2017 at 12:09 PM
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  8. Hk316

    Hk316

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    Could you guide me on how to fabricate the PCB for this ic?
    What are the things I need to consider?
     
    Hk316, Nov 15, 2017 at 12:26 PM
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  9. Hk316

    kellys_eye

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    PCB design/fabrication is beyond the scope of this reply - try downloading one of the common 'free' online PCB software packages and following their basic tutorial.

    You should find a typical QFN footprint in the component library of many of the better software packages that can be edited in-place to 'stretch' the pin positions to the 'weirdness' that is the UKJ pinout. Dragging traces from the 0.5mm pitch pins to a standard 0.1" matrix layout should be straightforward enough.

    Some (many) online design packages allow you to simply 'design-and-click' and have the finished article sent straight to you.

    There may be someone on here with the time and knowledge to 'knock one out' (giggidy) for you but I'd be imposing on their generosity to assume so......
     
    kellys_eye, Nov 15, 2017 at 12:52 PM
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