From: Fred Bloggs
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Subject: Re: lowest current regulator
Date: Sat, 21 Dec 2002 02:28:38 GMT
NNTP-Posting-Date: Fri, 20 Dec 2002 18:28:38 PST
Organization: EarthLink Inc. -- http://www.EarthLink.net
> what is the lowest quiescent current linear reg?
The lowest quiescent current for the CMOS LDO's is running in the
vicinity of 1-2uA. Some of the state of the art offerings are supplied
by Seiko Instruments, Torex, Ricoh, National Semiconductor, Linear
Technology, Baylinear, and Maxim. Most of the products have 2% accuracy
standard, current limiting, electronic shutdown, 100mV dropout at rated
current, 100ppm/oC or less tempco, and 20-35uVrms total output noise.
The Seiko S-812 series is obsolete and replaced by the improved S-812C.
One aspect of the Seiko S-8XX line is that it's available off-the-shelf
from Mouser at reasonable pricing. There seems to be a conflict between
achieving reasonable dropout voltage and maximum input voltage, but if
you need up to 30V input handling capability, then the MAX1615/16 are an
option at Iq=8uA. LTC has the 1761 with Iq at 2uA, Torex has the
XC6201/6 with Iq=1-2uA, Seiko has the S-812C at Iq=1uA, Ricoh has the
RN5RZ at 20uA ( there may be more- take a look), ON Semi has the NCP502
series at Iq=40uA, National has a very wide range of offerings like the
LP398X at higher output currents with Iq=70uA IIRC, and last but not
least is the Baylinear BA1XX line.