Good 3.3V regulator

Discussion in 'General Electronics Chat' started by msr, Aug 12, 2010.

  1. msr

    Thread Starter Active Member

    Jul 8, 2008
    62
    1
    Hello,

    Can someone sugest me a good 3.3V regulator (step-down)?
    It will be used to power a OEM board with tolerance of -100mV and +200mV.

    Thanks!
     
  2. kingdano

    Member

    Apr 14, 2010
    377
    19
    use digikey's filtering to find a suitable part (or try to)

    if you run into problems finding one, come back and post again.
     
  3. msr

    Thread Starter Active Member

    Jul 8, 2008
    62
    1
    I can't found none until now. LM3940 seems nice but needs 5V at its input.

    Another important requirements:
    Input voltage: 3.7V (battery)
    Output current: > 200mA

    If it was trough-hole would be nice, but SMD is also ok.

    Thanks for the hint, I will keep searching!
     
  4. bertus

    Administrator

    Apr 5, 2008
    15,638
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  5. sage.radachowsky

    Member

    May 11, 2010
    241
    38
    For linear regulators, search for "LDO" == Low Drop Off.

    That is the term for a linear regulator that requires little overhead above the regulation voltage.

    But my other suggestion is that there are many switch-mode regulators that are designed for this conversion, that will allow the device to run even when the batteries get pretty low. They will take in for example, 2.8 - 4.2V and put out 3.3V. Disadvantages: generally use a coil and a couple caps for external components, and some added EMI.
     
  6. kingdano

    Member

    Apr 14, 2010
    377
    19
    not to be nit picky,

    but isnt LDO = low drop out?
     
  7. sage.radachowsky

    Member

    May 11, 2010
    241
    38
  8. jbeng

    Member

    Sep 10, 2006
    19
    1
  9. bertus

    Administrator

    Apr 5, 2008
    15,638
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    Hello,

    @jbeng:
    The parts you show in the links will NOT work.
    The input voltage needed is to high.
    The OP wants to run on a lithium battery of 3.7 Volts.

    Bertus
     
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