For our OP's application, out of the regulators you mentioned only the LM317L will get close to what they need to do; regulate current at 5mA. The rest won't regulate at lower than 10mA.yea bro it depends in wich lm317 regulator ur choosing ! u have 4 series L,M,T,K
the LM 317 T can handle upt 1.5 ampere ,or if u want u can use the M one it can handle arround 1 ...
Sgt, I don't see how that's gonna work. Have you tried simulating it with a variable load? The constant-current will work, of course, but when the load is greater than 1k, it does not look like a good voltage source. A good current-limited voltage source should cross over from constant voltage to constant current fairly crisply.Here's a schematic on how it should be wired up:
Note that the model in the SPICE library simulation had a Vref close to the extreme limit; I had to increase the 270 Ohm resistor to 280 Ohms in order to achieve the desired limitation.
Note that the two LM317's will have at least 1.7v+3v = 4.7v dropout across the both of them; so you should use a 10v supply.
"Rload" simply indicates where you should connect your load.