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LTC3623 - Simulation for negative output

Dear support team:

I'm trying to simulate the circuit from the figure 10 of the LTC3623 datasheet, as I need a negative output. Please refer to the following schematic:

After running the simulation, the SW node begins to oscillate and the output voltage starts to go under 0 V. At some point the inductor current increases indefinitely and it just stops working:

Can you please help me to figure out what's happening? We just bought the development kit and I would like to try the IC in this configuration.

Thanks in advance!

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