BCCs: Nice LDO

LM78LCxx looks like a very nice regulator family.

I've never used an MC78LCxx regulator BUT from ON Semiconductor it's
about certain that you can rely on what the datasheet says. Care needs
to be taken that you know how o interpret a given datasheet figure.
Many people often don't.

The question with reputable manufacturers is usually not "are they
telling the truth" but "do I understand what they are saying".

In this case the spec seems clear enough

   http://www.onsemi.com/pub_link/Collateral/MC78LC00-D.PDF

1.1 uA typical qiesecent, under 4 uA worst case,.

BUT
there is a "scare" in the words where they say Io=3D 1 mA to Ionom,
which makes the Iq spec rubbish.
BUT
figs 10 & 12 remedy this by specifiying I0 =3D 0 mA.
Note that figs 11 & 13 DO NOT specify Iout so could be playing games
but, given figs 10 & 12 "you'd hope" [tm] that in fact Iq was with I0
~=3D 0 mA in all cases.

Looks like a very useful regulator.
I used to use the nice LM2936, TO92, 5V 50 mA Io max.
>From memory typical Iq was 14 uA and it used to better claimed values usef=
ully.
(Gaggles ... 15 uA at 0 uA. Rises with Io of course).

> I conducted a quick survey of LDO regulators. I picked the first three
> on Farnell that matched these characteristics:
>
> - max 50mV dropout
> - min 50mA output current
> - 3.3v fixed output
>
> (I also excluded any items out of stock or not available in the UK).
> All three of the results I picked were =A31 or less.
>
> The typical quiescent currents were 400uA (Texas TPS73133), 170uA
> (Texas TPS79133) and 1.1uA (ON Semi MC78LC00[1]).
>
> What I would like to know is how realistic the 1.1uA quiescent current
> is. =A0This seems low compared to most other devices. =A0For a battery
> powered device, this thing could power a circuit in sleep state for an
> awfully long time and hence it is interesting. =A0Yes, I could just
> order one up and test it, but I thought I would ask for opinions first
> and I seriously doubt my meter is accurate enough!
>

> 1 - http://www.farnell.com/datasheets/87792.pdf

--=20
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