Also beware of much higher quiescent current if the regulator is in=20
dropout.  This may or may not be in the spec sheet.  You can have a=20
situation whereby as a battery approaches fully discharged, and its=20
output voltage goes into the dropout voltage of the regulator, the=20
regulator then draws much higher quiescent, and the battery drains much=20
faster in this last 15% (or whatever) of its useful range.

J

Bob Blick wrote:
> Hi Mario,
>
> Each part design has its own characteristics, so you need to look at the
> graphs in the data sheet. But in general most regulators add the
> quiescent current to the load current, plus a percentage of the load
> current.
>
> With PNP-output low-dropout regulators the additional can be a fairly
> high percentage, up to five percent.
>
> Cheers,
>
> Bob
>
> On Sat, Dec 31, 2011, at 06:28 PM, Electron wrote:
>>
>> Hello,
>> talking about quiescent current of a fixed voltage linear vreg, say this
>> vreg's
>> quiescent current is e.g. 5mA, and the load is 20mA: will it draw 25mA,
>> or the
>> quiescent current is the minimum absorbed, but if the load is>  Iq then
>> no more
>> will be absorbed? i.e. it will still draw 20mA?
>
>
--=20
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