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TPS2041C Back Conduction

David Wang11
Expert 7400 points
Other Parts Discussed in Thread: TPS2041C, TPD4S214, TPS2041B, TPS2065C-2

A USB OTG within a device is being used to charge the device but also act as a host to communicate with other USB peripherals. Would like to know if a USB host is plugged into the USB OTG port (providing 5V), will the TPS2041C  back conduct from OUT pin to IN pin if the power is off on the input side?

  • 0
    TI__Expert 5275 points

    Hey David,

     

    I cannot speak to this part specifically, but back conduct is an issue that must be dealt with in USB OTG system.  Not only could this happen if the power if off on the input, but also if there is a voltage difference.  Ex. 4.5V going out, with 5.5V comming in.  You might want to take a look at TPD4S214 for this application.

    It is a switch with adjustable current limit.  Also provides back conduction, FLT, and ESD protection for OTG devices.

     

    Best Regards,

    Adam

  • 0 in reply to Adam Hoover
    TI__Expert 7990 points

    The TPS2041C will not conduct current from OUT to IN when IN is unpowered.  If IN is powered, pulling /EN high will also disable reverse current.  However, when disabled with the input powered, an output discharge will draw current.  Within the "C" family, the TPS2065C-2 will not have an output discharge.  Another alternative for a 0.5A part is to use the TPS2041B which does not have an output discharge.