SMPS in parallel with linear reg

Discussion in 'General Electronics Chat' started by stoopkid, Aug 26, 2012.

  1. stoopkid

    Thread Starter Member

    Mar 3, 2011
    136
    1
    I want to completely bypass the micro USB plug and linear regulator on my Raspberry Pi and replace it with a SMPS and barrel jack. Can I simply put the SMPS in parallel with the linear reg or do I have to remove the linear reg? I'm just wondering if having no higher voltage but a capacitor to bleed into if the linear reg would bleed backwards or something.

    Thanks.
     
  2. kubeek

    AAC Fanatic!

    Sep 20, 2005
    4,670
    804
    You should take the linear reg out.
     
  3. #12

    Expert

    Nov 30, 2010
    16,284
    6,797
    The right way is to isolate them from each other with diodes but, that is going to mess with the voltage available by a significant amount. Do what kubeek said.
     
  4. stoopkid

    Thread Starter Member

    Mar 3, 2011
    136
    1
    Thanks guys
     
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