Can we generate 3.3V output with 3.3V input using Buck Regulator?

Discussion in 'General Electronics Chat' started by sharath_412, Dec 24, 2007.

  1. sharath_412

    Thread Starter Active Member

    May 7, 2007
    32
    0
    Hi All,
    I was using a buck regulator to generate 2.8 Volts from 3.3 volts. Now i need 3.3 volts output. Can I use the same buck regulator with the same input voltage of 3.3 volts.

    regards
    sharath
     
  2. nanovate

    Distinguished Member

    May 7, 2007
    665
    1
    Not really, any real switch will some small voltage drop across it. What is the reason you need a regulator? At those small voltage differentials you can often use an LDO (still has a small V drop from input to output).
     
  3. mrmeval

    Distinguished Member

    Jun 30, 2006
    833
    2
  4. Papabravo

    Expert

    Feb 24, 2006
    10,137
    1,786
    A SEPIC converter has the possibility to have its input either above or below the output voltage. Is it right for you? Hard to say without knowing your requirements.

    A 3.3 Volt LDO will need at about 3.45 V on the input for 150 mV LDO. Your mileage may vary.
     
  5. sharath_412

    Thread Starter Active Member

    May 7, 2007
    32
    0
    Thanks for the sugesions:
    Actually I am using Power Management unit which takes 3.3 volts. This PMU gives out other supplies. As mrmeval said I think we can use the 3.3 volts directly from the source.

    regards
    sharath
     
  6. n9352527

    AAC Fanatic!

    Oct 14, 2005
    1,198
    4
    Or a buck boost could do it.
     
  7. cooloo

    New Member

    Sep 28, 2007
    4
    0
    Charge pump regulator can do it . Sometime we can't use 3.3V directly due to locked up on the digital circuit if for some reasons it falls out of V specs. The regulator can help it stay in 3.3V . Sorry for my English . Kinda to old to learn to write it correct .
     
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