How to create footprint from IC diagram when no recommended layout is given?
Method #1:

Tools->IPC Footprint Wizard->QFN and go from there. 

This wizard is based on  IPC-7351 standard, the main standard for footprint creation. The standard is not straightforward if you want to calculate the footprint dimension by your own so it´s highly recommended to use the wizard.



Method #2:

Refer to AN-772. A Design and Manufacturing Guide for the Lead Frame Chip Scale Package (LFCSP)