LDO or DC-DC converter?

Discussion in 'General Electronics Chat' started by sudil99, Mar 28, 2012.

  1. sudil99

    Thread Starter New Member

    Mar 9, 2012
    15
    0
    I need a 5V and 1A supply for my portable device. I am thinking of using 5 * 1.2 V NiMH batteries.

    Which regulator shall I use: Low dropout regulator or DC-DC converter ?
     
  2. bountyhunter

    Well-Known Member

    Sep 7, 2009
    2,498
    507
    Depends on your design requirements. The LDO is way simpler and less noisy, but the buck switcher might be a little more efficient.... not a huge efficiency gain because when VIN and VOUT are close, bucks are not really efficient. The switch is on most of the time anyway. I would probably use the LDO.
     
  3. chimera

    Member

    Oct 21, 2010
    122
    2
    5V 1 A charger from ebay. BEST!
     
  4. jwilk13

    Member

    Jun 15, 2011
    228
    12
    If you use a LDO, your efficiency is going to be in the 83% range. That may or may not be good enough for your application. Also pointed out by bountyhunter is the fact that LDO's are much simpler (usually only a couple of capacitors), while a switcher is going to involve several more components (typically an inductance, a few capacitors, some resistors, maybe some diodes). And there's no guarantee that your efficiency is going to be much better with a switcher.

    I'd go with the LDO.
     
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