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LM5113: How to connect VDD and HS pin with BGA package

Part Number: LM5113
Other Parts Discussed in Thread: LMG1205

Hi team,

I have a customer design in LM5113 and confuse with how to connect the VDD and HS pin.

There have two pins of VDD and HS and should they open another one or they can short them.

  • Hi Len,

    Thanks for reaching out!

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    Yes, the corresponding pins should be shorted on the board.  Below is a layout example from our LMG1205 EVM.  The LMG1205 is pin-to-pin with LM5113.  The LM5113 is not recommended for new designs and I would suggest pushing our customer towards our new device (LMG1205).

    This layout example is in the Altium files located on the LMG1205 EVM page (along with the PCB layers given in a PDF form as well).  You can see the SW node is connected through several vias here, and the VDD is shorted together on the top layer.

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    Both of the datasheets also have some layout suggestions as well:

    I hope this helps!

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    If I answered your question, please press the green button; otherwise, feel free to follow up!

    Thanks!

    Aaron Grgurich

  • Hi Aaron,

    Thanks for your reply.

    Another question, Why LM5113 is not recommended for new designs? Is there any issue? or need to be notice?

  • Hi Aaron,

    And what's the different with these two part number?

  • Hi,

    Our expert is currently out of office, but will get back to you within the next couple days. Thank you for your patience.

    Best regards,

    Andy Robles

  • Hi Len,

    Thanks for asking!  The LM5113 is not recommended for new designs because it is an older device with a new, pin-to-pin replacement, the LMG1205.  (Be sure to use the correct package)

    Most of the specs are very similar or the same.  Drive current it the same, etc.  Going through the datasheets / comparing them should be a solid start.

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    I hope this helps!  Feel free to follow up with additional questions!

    Thanks,

    Aaron Grgurich