LT3652 Inductor saturation current
From context (and having used a lot of parts from LT), \$\Delta I_{(MAX)}\$ is the peak to peak ripple current in the inductor, so it should really read \$\Delta I_{L{(MAX)}}\$

Normally, this is around 30% of maximum nominal current (maximum charge current in this case), and assuming you have figured out the inductor value for that value, choose an inductor that has a saturation rating of 1.15 \$I_{CHG{(MAX)}}\$; i.e. Peak charge current + peak ripple current.

Note the words on the V•μS rating (reproduced below):


  Inductors must also meet a maximum voltsecond product requirement. If
  this specification is not in the data sheet of an inductor, consult
  the vendor to make sure the maximum volt-second product is not being
  exceeded by your design. The minimum required volt-second product is:


See page 14 for the formula.

If you have an inductor where the datasheet does not specify the V•μS rating, I would try a different manufacturer. Coilcraft usually does a really good job here.