LTC3621 max Vin is 17V.
We will double check this with the simulation group. Please update your LTspice library later on to get most recent model.
There is no ESD circuit in the LTSpice model.
Hi team,I have used the LTC3621IDCB-23.3#TRMPBF in my design and my input voltage is about 5v and configured to burst mode of operation.The feedback is bypassed to the SW pin(1) through the inductor.The output voltage at SW pin(1) is 3V and INTVCC pin