I will use the adjustable LT3015 as an example. http://cds.linear.com/docs/en/datasheet/3015fb.pdf
You can set the output voltage based on the equation Vout=-1.22(1+R2/R1) + R2*Iadj where Iadj is 30nA nominally.
Now, the datasheet shows nominal R1 values for different output voltages. Most of these nominal R1 values are around 12K, giving us a resistor divider current of ~100uA. It also mentions that the R1 value should be less than 50K to help keep R2 value low enough so as to minimize errors from the adj pin current.
My question is, is there a specific reason they chose the nominal R1 values to have a 100uA divider current? Is there anything stopping me from using much lower values, lets say in the hundreds of ohms?
I understand that will increase the quiescent current(correct me if I'm wrong), but if I don't care about that, does it matter? Are there any pros and cons regarding transients or efficiency depending on what my resistor divider current is?
In their table of output voltage resistor divider values, for -5V they have R1 as 12.1Kohm and R2 as 37.4Kohm. Why not R1 as 1Kohm and R2 as 3.09Kohm?
Is this something I should contact LT about or is there an actual reasoning. Looking at other regulators, I don't think it specifies either.