Can a 3.7v LiPo battery Boosted to 5V provide 2A peaks?

Discussion in 'General Electronics Chat' started by mortonc, Jun 18, 2014.

  1. mortonc

    Thread Starter New Member

    Jun 6, 2014
    7
    0
    I have a GSM device which runs at around 100mA most of the time however during transmission it can have v. short peaks of up to 2A.

    It runs on 5V and I am planning on powering it with a 3.7v LiPo battery which is charged by a 6V Solar Panel.

    The supply would then be boosted up from 3.7v to 5V to power the device.

    What I would like to know is how I could ensure that I could power it from the LiPo. Perhaps through the use of a capacitor? Or will it be fine without interference?

    Thanks
     
  2. #12

    Expert

    Nov 30, 2010
    16,248
    6,745
    The devil is in the details. 2 amps for a millisecond? No problem for a capacitor.

    Get down and dirty with the "how much" and, "how fast" and we can do some math.

    Note to self: Must find out what a GSM is.
     
  3. BobTPH

    Active Member

    Jun 5, 2013
    782
    114
    A cellular modem.

    Bob
     
  4. #12

    Expert

    Nov 30, 2010
    16,248
    6,745
    So, mortonc want to fire bursts of information, probably from a picocell?
    Entirely doable, but we need numbers for the math.
     
  5. mortonc

    Thread Starter New Member

    Jun 6, 2014
    7
    0
    Don't have an oscilloscope so no way to give you a firm reading but I'm informed that it has 2A peaks for 477uS. Don't know how often.
     
  6. takao21203

    Distinguished Member

    Apr 28, 2012
    3,577
    463
    MCP 1640 should be fine, with an additional low ESR cap, and maybe also needs an additional small inductor inbetween.

    4.7uF ceramic from the booster is not enough for 500uSec or is it?
     
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