I am about to order my first driver.
I am a bit confused on the LVP option.
Low Voltage Protection (LVP):
1. No LVP
2. 2S LVP (for 2S cells) - ~6V Ramp
3. 3S LVP (for 3S cells) - ~9V Ramp
4. 4S LVP (for 4S cells) - ~12V Ramp
I am creating a Single CR123/RCR Light… If I wanted LVP. Which profile should I use?
Thanks!
if a driver is labled as such it is 2-4S
so likely wont even run on 1S
Could you provide a link to the driver?
Sure!
It’s: http://www.mtnelectronics.com/index.php?route=product/product&product_id=525
Here is my build so far:
22mm MTN-MAX 1A-6A Buck Driver - 5V-18V
- Output Current: 1A
- Driver Program: MTN-MAX Standard
- Inductor Type: Coilcraft
- LVP: ~6V Ramp
- LED Type: 3V
- Input Voltage: 2S (~8.4V)
- Memory: Yes
That is for a 2 cell setup. This is the driver you will want for the light. You will want to subtract 5 chips off the circuit for a 1A drive current.
Yep, the driver you listed is a buck driver; buck referring to needing to drop the voltage a considerable amount. Buck is the opposite of Boost.
Running a “normal” 3 volt led off a single lithium rechargable just needs a simple linear driver. Any driver using 7135 regulators would do.
What diameter do you need? There are a few different linear drivers that would work. 7135’s can always be removed or added and Richard usually has an option for that.
Thanks for the info! Learning so much 
It seems like I need a 22mm. I saw what @nitroz posted at 20mm just a hair smaller from the original driver but I think it will work