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High side switching.

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

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  1. Jim

    Jim Guest


    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

    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.



  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):

    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
    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
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