Problem with boost converter
There are a few design flaws overlooked from the datasheet.


Output is 11.6V = Vdd =Bootstrap which exceeds > 5.5V  and 
Ipk inductor = 1.5 output may exceed L rating 2.9A which may be caused by 1.) and
Switch Current up to 2.85A "spec"  = is not same as = I out max at a 11.6V boost voltage.  
Your heater load RX is not given.