LiPo charger with automatic load cutoff

Discussion in 'The Projects Forum' started by Ladvien, Aug 12, 2013.

  1. Ladvien

    Thread Starter New Member

    Sep 29, 2012
    16
    0
    I'm hacking my way through a LiPo charger that is sensitive to being plugged into a supply; I'm shooting to have it automatically disconnect from the load when in charge mode and automatically switch back to duty mode when unplugged from the charger. I'm not entirely sure I understand MOSFETs (I'm actively reading, don't worry). Especially whether or not I'm using the depletion MOSFET correctly.

    The circuit is around the MCP73213.

    Again; hack, and comfortable with it. But I'll take any criticism with thanks.

    :)
     
  2. Bernard

    AAC Fanatic!

    Aug 7, 2008
    4,172
    397
    Maybe this would do: Assumes that with AC adapter removed, the input will fall to 0V. From memory, FDS9435 RDS 80 mΩ @ - 4.5 V on gate., also it is SM , but just about any similar P- FET should do.
     
    Last edited: Aug 15, 2013
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