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
    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
    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