0
\$\begingroup\$

why we need power plane in PCB design, suppose i have 6 different supply rails like 1.2v,1.8v, 2.5v, 3.3v and 5v and 12v supply then how much power plane do i need , and how can arrange them Layer stack up

\$\endgroup\$
4
  • \$\begingroup\$ please give some suggestion .....your suggestion would be very helpful for me ....thanks \$\endgroup\$ Commented Dec 8, 2017 at 11:14
  • 1
    \$\begingroup\$ How many layers have you planned in your PCB? \$\endgroup\$ Commented Dec 8, 2017 at 11:29
  • 1
    \$\begingroup\$ Work out the requirements for each supply individually ... some may be low current or only to a few components; these won't usually need a power plane. You may be able to group all the 2.5V components and their regulator together for example. If you're still in doubt, add this info to the question. \$\endgroup\$
    – user16324
    Commented Dec 8, 2017 at 12:41
  • \$\begingroup\$ i planned for 12 layer. i need at least 8 layer to route my board bcoz high speed routing is involve in board.@flyerdragon. \$\endgroup\$ Commented Dec 11, 2017 at 4:24

1 Answer 1

3
\$\begingroup\$

It depends totally on where you need the power, how much power and on your power integrity requirements.

I have done things like that on a single plane, or on 4 planes, it just depends on what you are about.

I would note that running a split power plane with a closely coupled high speed signal layer is a bad idea from a return current perspective, so some care is advised, but there is nothing inherently wrong with split (even very split) planes if your part placement works with that.

\$\endgroup\$
0

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.