[time-nuts] Linear voltage regulator hints...

Tim Shoppa tshoppa at gmail.com
Mon Dec 8 14:30:23 EST 2014

Dan -
  Almost all the 3-terminal 7805-style regulators are going to have tempcos
near -100 or -120PPM/DegC.

  Bare 5.6V zener has a tempco closer to 40PPM/DEGC.

  I don't know anything that combines the reference with the pass device in
the same package and gets to a few PPM/degC. Obviously few-PPM references
are readily available.

Tim N3QE

On Mon, Dec 8, 2014 at 1:18 PM, Dan Kemppainen <dan at irtelemetrics.com>

> Hi,
> In playing with some oscillators and a GPSDO here, I think I'm seeing a
> voltage sensitivity issue.
> So, I started looking at the output voltage of various regulators vs.
> temp. Using standard LM/UA type linear regulators and some LDO's, they all
> appear to be pretty sensitive to temperature. (millivolt / few degrees
> Fahrenheit sort of sensitivity). Most of the datasheets seem to ignore temp
> sensitivity. Almost like they are so bad they don't want to publish it...
> Does anyone have hints on TO-220 or D-Pak type regulators that have really
> good temp coefficients and good line regulation? A few PPM/Deg C might be
> nice, if possible. Or am I into a 'roll you own' type design...
> Dan
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