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Operation of the BATFET in NVDC designs

Jagadish Singh1
Prodigy 50 points

Hi ,

I'm looking at the sizing of the body diode for the BATFET, but did not see any literature for this.

Could you please point  out whether the body diode is required at all for the design (suppose the design could be done with a power JFET).. and if the diode is definitely required, how to go ahead with the sizing?

I'm assuming that the only time the body diode is functionally useful is when the wall adaptor is removed from a system that is ON and the power is now delivered by the battery alone.

thanks, 

  • 0
    TI__Mastermind 18200 points
    Jagadish,
    All of the MOSFETs that TI offers include the inherent body diode so back to back FETs will be required for a TI solution.

    The current the body diode can handle is in theory the same as the MOSFET current rating. The only thing to watch out for is you will be practically limited by the thermal limits of the device, and the power dissipation through the FET that comes from the finite voltage drop (usually 0.6-0.8V) across the diode.