Hello

Check out the Infineon TLE 4264 G.  45V input voltage.  400ua max current
consumption.  It is also very well protected against short and reverse
voltage.  It comes in a SOT223.  Infineon has a whole family of related
parts in different packages.

David Geier
Spectra Precision

-----Original Message-----
From: Chris Eddy [mailto:ceddy@NB.NET]
Sent: Friday, October 15, 1999 10:30 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Low current power for a PIC


Associates;

I have a PIC that must live off of a 220uF cap for 7 seconds.  I can get
the PIC to consume low power, but I am having trouble getting the
regulator designed.  The 78L05 sucks 2-3mA Q current, way too much.
Looking for 50-100uA.  The low dropout regs are neat, but they have a
very limitted Vin max.  I need 30V.  I built a pass regulator with a
res, zener, and NPN trans, which meets my goals, but since the current
through the zener is low, then as the V on the C drops off, then the V
on the zener drops off, and the V on the PIC droops as well.  This
causes the RC osc to skew, and my highly important timer gives me
predictable garbage!

Any great ideas?

Chris Eddy
Pioneer Microsystems, Inc.