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'[EE]: Low Current Voltage Regulator -- where to ge'
2002\01\05@063803 by Roman Black

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(sorry! fixed topic tag)

John Hansen wrote:
>
> I'm looking for a 5 volt regulator that draws very little current when
> there is no load.  Mouser Electronics has a Seiko part (S-81250SGY) in a
> TO-92 package that looks like it would be just about perfect (1.2 uA and
> only ~60 cents) but they won't have any available until at least the end of
> April.  Does anyone know of either an alternative source for this part or
> an alternative part that is actually shipping?  (I'm looking for a
> thru-hole part.)

If you are willing to build it discrete
(couple of transistors, inductor) it might be
possible to adapt this 2-transistor SMPS
regulator, it will give better efficiency
when running and should be adaptable to very
low power "standby" when there is no load.

The circuit is already designed to have
everything off when there is no load, with the
exception of one resistor and zener which
is used as a voltage reference. Changing
this part of the circuit slightly will give
standby under 2uA. Of course if you don't
need efficiency when running it may not be worth
the complexity of even a simple SMPS regulator.
-Roman

Here's the 2-tran SMPS 5v regulator:
http://centauri.ezy.net.au/~fastvid/smps.htm

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2002\01\06@135157 by Dwayne Reid

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John Hansen wrote:
>
> I'm looking for a 5 volt regulator that draws very little current when
> there is no load.  Mouser Electronics has a Seiko part (S-81250SGY) in a
> TO-92 package that looks like it would be just about perfect (1.2 uA and
> only ~60 cents) but they won't have any available until at least the end of
> April.  Does anyone know of either an alternative source for this part or
> an alternative part that is actually shipping?  (I'm looking for a
> thru-hole part.)

Microchip bought Telcom Semi - I have used the TC-55 series low drop-out
regulators with good results.  Check the Microchip web site and get samples
from the same folks who give you PIC samples.

dwayne


Dwayne Reid   <.....dwaynerKILLspamspam@spam@planet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax

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