Many thanks for Yours and all the Others' replies.

I need the linear vreg to get a clean +3.3V after a noisy buck SMPS a few
(as little as possible) volts above.

Efficiency is important and I don't want to ruin it with a LDO vreg that
draws 5-10 (!) mA by itself, as the load is at most only 20 mA.

It seems I can only find either vregs with high Iq or very low Iq, but
expensive.

Could anybody suggest a 1 or less mA Iq +3.3V vreg that is really cheap?

With kind regards,
Mario


At 23.54 2011.12.31, you wrote:
>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 thi=
s
>>> 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?
>>
>>
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