Synchronous boost converter
For convergence issues try/play around with different simulation parameters to allow more error/tolerance in your simulation results (minimise tolerance parameters. Here is screenshot of simulation settings of LTSpice.
 

I have not used multisim, but it should have something similar.

Anyway, it is highly likely that the mosfet driver IC model is your source of error. Before you go any further I suggest you do an simple analog open circuit simulation of your circuit (dont use that driver). Use a comparator and triangular wave to generate your PWM with the right duty cycle and see if your "Boost" works. Always resort to using very less IC models. Try to keep it analog as much as possible.







simulate this circuit &ndash; Schematic created using CircuitLab

Edit the schematic and try with your values. I don't know Fsw, Vout, Iout, etc.
This schematic editor looks legit, try this one. Pro tip, always use a simulation software that has good community support.
Cheers.