Tool/software: WEBENCH® Design Tools
Using Webbench my 5V to 3.3Vdc circuit puts out 4.1V. The resistor values suggested Rfbt= 232K in parallel with 12pf and Rfbb= 51.7K
What causes this error? Is there a minimum load for this part? There is 22uF on the output and it is lightly loaded. The mode pin is grounded.