Operating current of 5.5V to 3.3v LDO regulator

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Hello

I am doing 5V to 3.3V linear regulator with LM2937.

The load on the 3.3V is 33mA.

LM2937 Datasheet:
http://www.datasheetcatalog.org/datasheet/nationalsemiconductor/LM2937-2.5.pdf


From page 3 of the datasheet, it looks like there should be around 66mA of operating current , for this low dropout regulator,

-but I measured it, and its in fact only 3mA of operating current.

-so who is right…my measurement , or the datasheet?
 

The data sheet is probably right. The specification you are reading is quiescent current when the regulator is delivering Imax 400mA or 500mA output. You are not loading it that much, I assume. With no load the quiescent current is only 2mA.

Keith.
 

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