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From: John Popelish
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Subject: Re: Lowest voltage drop diode
Date: Wed, 25 Sep 2002 00:54:52 GMT
NNTP-Posting-Date: Tue, 24 Sep 2002 20:54:52 EDT
> 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 ?
> Oguz Murtezaoglu
> BiPOM Electronics
This one has a .2 volt drop at 100 ma:
In some cases, you can use a mosfet as an active rectifier by turning
the thing on when it has reverse voltage applied to the drain. At low
currents, the drop can be very close to zero. Even a tiny BZ170 would
only drop about 25 millivolts with its 5 ohms channel resistance.
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