LT8335Production
The LT8335 is a current mode DC/DC converter capable of generating either positive or negative output voltages using a single feedback pin. It can be configured...
Datasheet LT8335 on Analog.com
it seems that the FBX-control voltage is automatically selected for positive/negative voltage to it. So just connect voltage divider from Vout to it and it will work - regardless of pos. or neg. output!
