SMPS in parallel with linear reg

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

  1. stoopkid

    Thread Starter Active Member

    Mar 3, 2011
    146
    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

    Expert

    Sep 20, 2005
    5,166
    966
    You should take the linear reg out.
     
  3. #12

    Expert

    Nov 30, 2010
    18,073
    9,577
    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 Active Member

    Mar 3, 2011
    146
    1
    Thanks guys
     
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