--- David VanHorn <dvanhorn@CEDAR.NET> wrote:
> >
>
> What is the Vth of the fet?
>
> You have to get the gate above Vth, to turn it fully on.
> For very low voltage designs, you end up needing either some
> mechanism to
> create a gate voltage supply, or just use bipolars.

Another way to do it is to use a dedicated MOSFET driver which contains
a charge pump to create the necessary high gate drive voltage. One such
circuit is the MAX622 (see http://www.maxim-ic.com).

I seen recommendations for it on some pages, but never used it as it's
not available from any retailer here in Romania.



=====
ing. Andrei Boros
Centrul pt. Tehnologia Informatiei
Societatea Romana de Radiodifuziune

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