You are looking at the wrong product mjteix.
The processors in the MBA are most comparable to the L7500 and L7700 (in special packages), so that's what you should look at.
Intel Specs (choose "Processor Numbers" then "Low Voltage Processors")
The special small package the MBA CPU is in necessitates a compromise on the voltage requirement, making them 20W TDP parts instead of the 17W of the L7[5|7]00 parts.
http://www.anandtech.com/mac/showdoc.aspx?i=3203