In the selection table for inverting regulator it's specified that ADP5073 can deliver 1.375A.
Here is simulation setup where I check its capability to generate -30V from +5V.
The values of Rfb, Rft, L1, etc. I took from datasheet hint table.
I tried with two loads - 1k and 100Ohm
1k - Ok, whereas 100 Ohm failed.
Any comments ?