Hi,

I conducted a quick survey of LDO regulators. I picked the first three =20
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).  =20
All three of the results I picked were =A31 or less.

The typical quiescent currents were 400uA (Texas TPS73133), 170uA =20
(Texas TPS79133) and 1.1uA (ON Semi MC78LC00[1]).

What I would like to know is how realistic the 1.1uA quiescent current =20
is.  This seems low compared to most other devices.  For a battery =20
powered device, this thing could power a circuit in sleep state for an =20
awfully long time and hence it is interesting.  Yes, I could just =20
order one up and test it, but I thought I would ask for opinions first =20
and I seriously doubt my meter is accurate enough!

David

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

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