Haven't done the math....

[SurvivorMcGyver]

Haven't done the math but what are your thoughts?

This has been sitting in my "things to evaluate" pile.....

Puuuuuuleeeeeze DON'T link from here. copy and paste in a seperate window if you will -- too much abuse for here and you'll probably find us cut off from samples. I never request ANYTHING unless it "fits" -- and I have quite a bit of stuff laying around just waiting (for time, intuition, circumstance...... and motivation..?? - with LOTS for real world use's other than e-cigs) -- thanks

http://focus.ti.com/lit/ds/symlink/uc2577-adj.pdf

Cheers (and happy vaping and modding)

McGyver

or (should have started a poll eh?) Over rated perhaps - and yes the efficiency sucks (but maybe as a 12v powered pass-through? - who knows)

PS: Disregard the test paramters -- they ARE NOT limits (to the imagination)

 

[UberDuper]

Smaller then the PTN04050C but looks like requires some external components. Looks like it might fit in a AAA box tho. Supports Vout as low as you wanna go. I've been thinking about building a box with a switch to select 3.7v, 5v and 6v. That might do what I want fairly easily.

The PTN04050C only goes down to 5v so I'd have to use a second switch to bypass the booster all together to get to ~3.7v (unboosted/unregulated battery voltage).

I might have to get me a sample.

UD.

 

[SurvivorMcGyver]

Smaller then the PTN04050C but looks like requires some external components. Looks like it might fit in a AAA box tho. Supports Vout as low as you wanna go. I've been thinking about building a box with a switch to select 3.7v, 5v and 6v. That might do what I want fairly easily.

The PTN04050C only goes down to 5v so I'd have to use a second switch to bypass the booster all together to get to ~3.7v (unboosted/unregulated battery voltage).

I might have to get me a sample.

UD.

Yep -- Great thinking. And fairly easy to accommodate. The 4050c has too many limitations (but there are work arounds). Max Vin is too low (for my design purposes) Voltage out is supurb (except, as you say, only 5V min). A by-pass system (or one in series) could help to get what we want

The boost AND flyback fuctions are key to obtaining my utlimate mod: Any Vin - Any Vout - With (any volt) charging circuit for any battery (1 or 2) - for any atti with the full range of "any in/out" in the pass through/charging mode. A watt control feature would be wonderful but is illusive to me. One can limit it VERY easily - but controlling (being able to set it) at a constant with variable (diminishing) voltage input -- Hmmmmm? Perhaps simply maintaing a constant yet adjustable rail (at the variable input) then adjust the wattage would simplify it......

Almost there........... (I think )

 

[SurvivorMcGyver]

BTW Keeping the efficiency in the 85-90% range is a true challenge....

 

[UberDuper]

Has anyone used one of these yet?
I don't use the 5v box I made with the ptn0405c and 2 14500s in parallel cause it's hotter then any 6v mod I've tried. Makes me wonder if the normal 5v and 6v mod with batteries in series aren't able to supply enough current. So I'm thinking about using one of these to make a 4.2v box instead. Or I could add a diode to the current box.

UD.

 

[SurvivorMcGyver]

{dig, dig, dig, dig........} Yup I have a couple! Still in my "to do pile" (IE: Parts bin) Moved on in thought, planning, and overall effort to a few designs with a bit more complexity -- but this STILL looks like a good one to move up on the list and perhaps utilize

Again folks -- Best NOT link from here (ooops?) -- you'll spoil it for when you may REALLY need it and then we are cut off.

Lately, I just purchase mine.

Couldn't remove thin link or I would have -- seems, if it an older post, edits are turned off