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Subject: Re: Lowest voltage drop diode
Date: Wed, 25 Sep 2002 11:12:41 +0100
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"Bob Wilson" wrote in message
> In article ,
> firstname.lastname@example.org says...
> >"oguz" wrote in message
> >> I am looking for a very low voltage drop diode ( or equivalent circuit
> >> ) that has a forward voltage drop of 0.2 Volts or less. Maximum
> >> current to be conducted will be less than 5mA.
> >> Currently, I am using a BAT85 Schottky diode from Philips. This has a
> >> forward voltage drop of 0.3-0.4 Volts maximum. I have looked at some
> >> Germanium diodes that have a drop of 0.3 Volts.
> >> Is there a way to do this with a MOSFET or Transistor ?
> >> Is a one-way conducting device of 0.2 Volt drop or less achievable by
> >> any means ?
> >Is this for reverse voltage protection? If so you can use a P-channel
> >enhancement mode MOSFET wired 'backwards', i.e. gate to 0V, drain to +ve
> >supply and source to load.
> ....providing your Vin is less than the gate breakdown voltage of the FET.
Indeed, or use a resistor divider on the gate with zener protection if not.
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