Need Output 3.3V from input of 1.8V to 2.0V

Discussion in 'General Electronics Chat' started by mpcotuong, Aug 27, 2010.

  1. mpcotuong

    Thread Starter Member

    Aug 26, 2010
    170
    0
    Hi All,

    Please help me to make the circuit ouput 3.3V to 5VDC from input 1.8V to 2.V. I have the circuit output only 1.8V but my Nail replay need min 2.9V to work. Please let me know how to solve this problem.

    Thanks,
    Kevin
     
  2. AMIT_GOHEL

    Member

    Jul 13, 2010
    67
    7
    mpcotuong likes this.
  3. sage.radachowsky

    Member

    May 11, 2010
    241
    38
    The part for you is TPS60211 from TI.
    Very good little charge pump chip.
    Very low quiescent and up to 100 mA output.
    1.8 to 2.0V is its sweet spot for input voltages.
    http://focus.ti.com/docs/prod/folders/print/tps60211.html

    Only thing difficult is it's an MSOP so a bit hard to solder.
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Without knowing your output current requirements, it will be difficult to make a recommendation.

    You should also specify what the input current is, or if battery powered, what the AH or mAH rating of the battery is.
     
  5. mpcotuong

    Thread Starter Member

    Aug 26, 2010
    170
    0

    Please let me know what is the input and output of your diagram? Why you are using transformer? Is that transformer?

    Thanks,
    Kevin
     
  6. mpcotuong

    Thread Starter Member

    Aug 26, 2010
    170
    0

    Thanks, for your sugguestion

    Kevin
     
  7. mpcotuong

    Thread Starter Member

    Aug 26, 2010
    170
    0

    I don't know what the output current. But the relay has not take 2.0V. My project output is only 2.0V and need at least 2.9 to 5V to operating the circuit.

    Thanks,
    Kevin
     
  8. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    OK, then.
    How much current do you need at 2.9v to 5v?

    How much current is available at your project output without it sinking below 2v?

    Unless you can tell us what kind of current is available, and what current you require, we cannot make a very good recommendation.

    If your current requirement at 2.9v to 5v is low (say, <10mA), something like an ICL7660S may work well for you.

    Keep in mind that to get 4v from 2v, you will need more than twice the current from the 2v supply than you can output, as no boost circuit is 100% efficient. Some are very close. About the best you can hope for is 90% efficiency from a typical boost circuit. Many are much less efficient.
     
  9. AMIT_GOHEL

    Member

    Jul 13, 2010
    67
    7

    No u not need to use transformer,i'm talking abt ckt after transformer..

    In a pic
    Left-input ,Right-output.
    At output side voltage will be doubled and fan-out will be half..
     
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  10. tom66

    Senior Member

    May 9, 2009
    2,613
    214
    You need an AC input for the voltage doubler to work. The OP said they wanted a DC to DC converter, if I read their post correctly.
     
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  11. mpcotuong

    Thread Starter Member

    Aug 26, 2010
    170
    0

    I need 100mA output

    Thanks,
    Kevin
     
  12. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    If you need 100mA output at 4v, you will need at least 220mA input at 2v.

    Is that available? If not, good luck.
     
  13. AMIT_GOHEL

    Member

    Jul 13, 2010
    67
    7
    hello kevin,

    will you tell me what you actualy suppose to do ?
    mean to say why you need this conversion ?
    if you explain your project we can help you in better way...

    Regards..:)
     
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