I'm trying to make a IR laser diode driver which needs 1.9V and ~80-100 mA constant current. Most of laser driver circuits in web has LM317 as a current source but that design has always voltage drop around 2.5V. Since I have 3V supply, i'm trying to find an alternative way with low drop-out voltage. I have found LT3085 (Datasheet) which says 275mV dropout voltage.
In datasheet's typical application section there is a circuit for Current Source but Vin=10V. Since LT3085 has "Wide Input Voltage Range 1.2V to 36V". How can I use with 3V supply?