Driving two leds with PAM2803
If you look at the curves on the PAM you will see the thing does not regulate the current till closer to 1.8V.

For the LED you are talking about you need a load resistor closer to 4.7R, not 2R.

Also, the diode is a Schottky diode, not a Zener diode.



If you plan on driving two of those LEDs in series with one PAM you are out of luck. The PAM can only go up to 6V, two of those LEDs at 700mA would require 6.6V.