about INTVCC of LTM4630?

hello,

Recently I make LTM4630 to output 1V to FPGA VCCINT for 18A.During my design,I find a question about INTVCC with different connect between LTM4630fa datasheet and DS2081-a as following:

the datgasheet tells that INTVCC should connect PGND ,but the DS2081-a connect it to SGND,and there is a 0 ohm between SGND and GND,which is right?

thanks.

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  • +1
    •  Analog Employees 
    on Aug 21, 2019 10:47 PM

    Please following the layout of the DC2081a board. Datasheet graphs sometimes don't differentiate SGND and PGND. For uModules with higher current, we usually ask the customer to use a separated SGND ground copper area, and connect the SGND to PGND underneath the unit. SGND is more quiet than PGND and INTVCC can be decoupled to SGND. THANKS!

Reply
  • +1
    •  Analog Employees 
    on Aug 21, 2019 10:47 PM

    Please following the layout of the DC2081a board. Datasheet graphs sometimes don't differentiate SGND and PGND. For uModules with higher current, we usually ask the customer to use a separated SGND ground copper area, and connect the SGND to PGND underneath the unit. SGND is more quiet than PGND and INTVCC can be decoupled to SGND. THANKS!

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