Connect with us

High side switching.

Discussion in 'Electronic Basics' started by Jim, Feb 2, 2004.

Scroll to continue with content
  1. Jim

    Jim Guest

    Hi,

    I have a radio module that I need to high side switch. (10mA)

    Any methods I have used so far have drawn alot of current in their own right
    (2mA).

    Can anyone offer suggestions or tips for high side switching this module?

    I was hoping to use 2uA in the switch. The unit runs from 3v supply.

    It needs to be a solid state solution.

    Thanks

    Jim
     

  2. How about using a low threshold voltage P-channel MOSFET. Sounds like the
    perfect type of part to meet your requirements. Any product of a great
    number would surely work, but for one possible example perhaps the IRLML6402
    (Digikey carries them):

    http://www.irf.com/product-info/datasheets/data/irlml6402.pdf

    With this kind of voltage level and current demand you could also probably
    use 74AC type logic gates or suitably beefy tiny logic parts.
     
  3. Use a PNP (2N3906) as the series switch, driven by an NPN (2N3904) to
    ground.
    A resistor (24K) in series with the bases is indicated. This will have a
    burden of .1uA
    plus the base drive for the NPN.
    --
    *
    | __O Thomas C. Sefranek
    |_-\<,_ Amateur Radio Operator: WA1RHP
    (*)/ (*) Bicycle mobile on 145.41, 448.625 MHz

    http://hamradio.cmcorp.com/inventory/Inventory.html
    http://www.harvardrepeater.org
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-