What is µMAX IC package?
Whereas most packages are used by several manufacturers, \$\mu\$MAX seems to be a package solely used by Maxim. It's an 8 pin SMT package, about as wide as an SO-8, but just 3mm long instead of the 5mm of an SO-8. This is achieved by using a 0.65mm pitch instead of 1.27mm.
Other manufacturers also go to ever smaller packages, but most often choose for leadless packages like DFN (Dual Flat No Leads).  





Intersil has this list of packages.
NXP has this list.  

Unfortunately my experience is that recommended footprints for a certain package aren't always consistent between manufacturers.