I used the TPS7A3301 in an application where i adjusted the feedback voltage using a DAC. Vin=-30 and Vout=-27 to -28. It worked nicely however i ran into a problem with this part at these voltages that made the solution non viable.
I would like to use the LT3090 in the same application where the output voltage can be changed by using a DAC or something similar. Vin = -30 and Vout=-27 to -28V.
Page 15 of the DS mentions the following:
For applications requiring higher accuracy
or an adjustable output voltage, the SET pin may
be actively driven by an external voltage source
capable of sourcing 50μA – the application limitations
are the creativity and ingenuity of the circuit designer.
Any thoughts how to achieve this without impacting on the noise performance of the LDO?