Highest efficiency IC available on the market - step-up boost converter?

Discussion in 'General Electronics Chat' started by stepas, Feb 26, 2010.

  1. stepas

    Thread Starter New Member

    Feb 24, 2010
    Can some please recommend a DC to DC converter boosting the voltage of 2 x AA batteries up to 5 V?

    I am interested in IC which would have highest efficiency at around 1A output current.

    Thanks ;)
  2. bertus


    Apr 5, 2008
  3. Audioguru

    New Member

    Dec 20, 2007
    5V at 1A is 5W. If the efficiency of the stepup converter is perfect (impossible) then two 1.5V alkaline AA cells would need an output of 1.67A if the cells are new and would need an output of 2.5A when they are run down a little to 1V each.

    Here is a graph from Duracell that shows two alkaline AA cells produce 1.5V each for only a few seconds when the current is only 1A and drop to 1V each in a few minutes.

    Here is a graph from Energizer showing than AA Ni-MH rechargeable cells delivers high current much better than alkaline.