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TPSM82810: PCB layout question

Sam Ting
Intellectual 2720 points
Part Number: TPSM82810

Hi team,

Could you comment whether the extended land pattern and solder paste design of PIN5 is necessary? Thanks!
The PCB layout engineers of my customer have some concern on the clearance between PIN5 & PIN6.

Best regards,
Sam Ting

  • 0
    TI__Guru*** 142860 points

    Hi Sam,

    Let me check on the reason for making pin 5's land pad larger.  It will likely be next week before I can give an answer.

    I calculate a pad separation of 250 um between pin 5 and pin 6.  Does this match what you calculate?  How is this an issue?  (I think there is less separation between pins 5 and 12, for example.)

  • 0 in reply to Chris Glaser
    TI__Guru*** 142860 points

    Hi Sam,

    I confirmed that you can choose to not extend pin 5's pad so close to pin 6, if you need to.  In most applications, pin 5 is connected to a large copper pour to carry the output current.  So, you will likely have copper there anyways from the Vout plane.  

    I am still curious what issue the spacing between pin 5 and 6 caused for you?

  • 0 in reply to Chris Glaser
    Prodigy 10 points

    Hi Chris and Sam,

    Got it. Thanks for the support. 

    The PCB layout engineer is concern about whether the distance is too short that increase the risk of shorting.

    However, after evaluating the process ability, we will convince him to built the footprint as TI suggestion.

    Thanks!

    Best regards,

    Kilo Wu