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From: Robert Baer
X-Mailer: Mozilla 4.75 [en] (Win98; U)
Subject: Re: Ultra low power precision voltage reference ?
Date: Thu, 07 Nov 2002 17:33:01 GMT
NNTP-Posting-Date: Thu, 07 Nov 2002 09:33:01 PST
Organization: EarthLink Inc. -- http://www.EarthLink.net
> Anyone know of any of these ?
> Ideally I'd like something between 4 and 8 volts. 1% using less than 50uA.
> Anything available or any preferences ?
The LM431 is an adjustable zener shunt regulator settable from 2.5V to
36V and is stable from 400uA to 10mA.
The LM4040 is a fixed shunt regulator available in 2.5V, 4.096V, 5V,
8.192V and 10V values; operating range from 60uA to 15mA (the 8.192V
and 10V units require more current - up to 100uA minimum).
The LM4040 is the closest to what you are asking about; output voltage
spec to 0.1 percent at rated drive.
Datasheet curves indicate the 2.5V unit regulates down to 45uA
(approximately); one might have to select units to have some operating
The curves show the 4.096V unit regulates down to about 50uA; again
unit selection would seem to be needed.
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