How to use LT1073 to provide 5V and 100mA output

[chesskin]

when i use the 120uH inductor and 470uF capacitor, the output can't provide 80mA.I follow the table 1 of the LT1073 data sheet

 

[justDIY]

try a bigger (higher value) inductor, and make sure your inductor has sufficient current handling abilities. if it's going into saturation, that will mess everything up. also make sure you have a lot of capacitance on the input and output.

 

[mneary]

Did you include the 68 ohm resistor from Vin to Ilim? It's important. See page 12 for the location of that resistor.

I'm assuming that you're using line 5 of the chart, and your input is a pair of Alkalines.