Stepping up 2.4V into 3.4V

Discussion in 'The Projects Forum' started by frustratednoob, Dec 21, 2012.

  1. frustratednoob

    Thread Starter New Member

    Dec 21, 2012
    Hey guys, this will be my first time posting in this forum.
    I was just wondering how do you step-up/boost a circuit from 2.4V to 3.4V using a boost converter?
    I was searching for that schematic online, but I have found many designs that are somewhat different.

    Please advise! :)

    *I'm using 2 x 1.2V AA NiMH Rechargeable Batteries, with a total current of 4600mAh, or 2300mAh each.
  2. t06afre

    AAC Fanatic!

    May 11, 2009
    How much current do you need? That is also important to know in order to help you:)
  3. Audioguru

    New Member

    Dec 20, 2007
    With two cells in series you get 2.4V at 2300mAh.
    2300mAh is not the total current, it is the time duration of a certain current which might be 2.3A for 1 hour. The total current might be 12A for a few minutes.
  4. ScottWang


    Aug 23, 2012
    If you use 1.2V x 3 then you will get 3.6V/2.3A.
    If you use boost converter may like this:
    W_in = 2.4V x 2.3A = 5.52W
    Assuming transfer effiency is 80%
    Iout = 5.52W/3.4V = 1.623A
    If you use pwm then the output current could be Iout_pwm = 1.623A / 2 = 0.812A
    absf likes this.