Dude, the info is all there....I could not be anymore help if I tried...bar making it for you...
the AMC7135 is prufect for the job, as I said...
Put 5 (320ma version) in parallel & you got 1600ma...on a nice D heatsink you will have no problem...
But most, 1 cr123A cells won't cut it for current...use two in parallel or a 3.7v 18650 li-lion cell...
Enjoy
Ktronik