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From: John Popelish
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X-Mailer: Mozilla 4.7 [en] (Win98; U)
Subject: Re: What is LDO ( regulator ) ?
Date: Sat, 11 Jan 2003 15:49:19 GMT
NNTP-Posting-Date: Sat, 11 Jan 2003 10:49:19 EST
> Sorry for a basic question.
> I guess it means = minimum voltage different between
> input and output at full load ?
> At high load current these IC require only low head room voltage, right ?
> 7809 require head room 2V
> LM317/350 require head room 5V
> LM1084 require head room 1.2V
> Am I correct ?
One other thing I should have mentioned: The high drop out types
(based on NPN darlington pass transistors) are inherently more stable
than the LDO types (based on PNP common emitter pass transistors).
Achieving good regulator stability and responsiveness over a wide load
current range is a little problematical with the LDO types, but is
pretty simple with the follower output types. This is one reason that
the LDO types have not become universal.
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