LiPo to 3.3V

Discussion in 'The Projects Forum' started by Pootworm, Dec 4, 2007.

  1. Pootworm

    Thread Starter Member

    May 18, 2007
    29
    0
    Hey all,

    I'm trying to regulate a LiPo down to 3.3V. I'm also trying to minimize battery impact. The voltage difference is too low for a linear regulator, so I'm thinking my only options are a zener and a switching regulator.

    I'm not experienced with either. The part count involved in a buck reg is a turn-off. I'm a little confused about how an MCU would interact with a zener - I'd need to maintain 10mA across the zener, and the MCU would draw varying levels of current...

    Any suggestions/pointers?

    Thanks in advance.
     
  2. eeboy

    Active Member

    Sep 27, 2007
    90
    1
    I may have misunderstood but...

    Considering a discharged lithium ion polymer cell is 2.7V you are going to have to use a buck/boost type switcher if you wish to take advantage of a full charge.
     
  3. Pootworm

    Thread Starter Member

    May 18, 2007
    29
    0
    I'm okay with hitting the recharge station once it sags below 3.3v and my system shuts down, so I'm not worried about the low end. I _am_ worried about keeping the voltage supplied to the rest of the circuit under 3.6v though (meddlesome max operating conditions and all).
     
  4. Pootworm

    Thread Starter Member

    May 18, 2007
    29
    0
    Oop, stumbled across LDOs online. Sounds like exactly what I'm looking for.
     
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