Thanks, that’s what I was afraid of (the cost in dollars, not the peg layout).
How about:
PSMN4R2-30MLD
or SiS414DN
I’d call SiS414DN the clear winner for this application except for the fact that it’s in a flat-no-leads package. I expect that it will be very difficult to solder for most people. (Actually reflow only for most people I think…). It’s also “Package Limited” to 20A, but I don’t think that’s very relevant here. PSMN4R2-30MLD has more exposed leads and should be a bit easier to hand solder.
EDIT: Clearly I made a mistake. PSMN4R2-30MLD is not that great.
EDIT 2: Clearly I can’t read a datasheet. SiS414DN isn’t that great. I made an error with units (ohms vs milliohms).
I have not evaluated the following FETs beyond Rds(on). Listed in order of Rds(on) performance at our voltage levels:
PSMN2R4-30MLD
PSMN2R8-25MLC
PSMN3R0-30MLC
PSMN3R9-25MLC
Possibly functional, but not characterized well by the datasheet (for our purposes):
PSMN1R5-30YL
PSMN1R5-25YL
Not considered due to high Vgs threshold:
PSMN4R0-40YS
PSMN3R3-40YS
PSMN2R6-40YS
Ok I just added some PSMN2R4-30MLD to my order. hopefully they end up working for our purposes. Just to confirm, other than the FET and the 22k resistor, everything else is stock from a 105c, correct?
I was wondering when/if anyone would incorporate the smaller LFPAK size but resisted suggesting it because of the tight pin spacing(I barely get by on attiny’s and 7135’s). Curious to see how much better it might be than the 2502 or it’s successor(you listening Dale?).
I agree, the pin spacing is very tight. Fortunately only one pin actually needs to be separated from it’s neighbors. Still, if a person is a beginner at reflow soldering I’d say that this is not the place to start their journey. The same thing applies doubly to hand soldering.
PSMN2R4-30MLD vs AO3400? Single LED performance is what matters for this driver I think, and that should restrict us to looking at higher Vgs numbers vs triples & etc. At 3v Vgs it seems like we’d have around a >20milliohm difference in favor of the PSMN2R4-30MLD, which translates to maybe a 0.08v difference in voltage dropped over the FET. To me that looks like approximately half an amp. As you know, all this napkin math doesn’t get us very far. We’ll have to wait for them to be built and tested. (of course it should beat the 2502 by a wider margin)
You’re trying to make me rebuild the Texas Poker yet again, aren’t you?
I would order a stencil if I were to do this one, I’ve been finding the re-flow is so much neater with a stencil and Kester E256 paste.
Edit: I don’t have many (if any) 15mm driver lights. The TP is 10mm and I’m pretty happy with the way it’s performing. That said, I do have a little stainless steel light on the way that I believe uses a 15mm driver…
With stencils I’ve found it very helpful to have a piece of cardboard or something the same thickness as the board or mcpcb with a hole to drop the board into. This lets the stencil lay in place flat and is easier to keep aligned.
Anyone built these yet? I think I have 3 blanks in, but didn't build one yet.
Gunga - Sorry so late to reply, but I could I suppose, but not sure bout Canada shipping - if it's too costly. Haven't built one my self yet, but want to for a SolarStorm SC02 mod. With the LFPAK33, I would think I'd get more power (lower resistance) than the old style BLF 15 DD that uses that tiny IRLML2502 FET. Not sure if I have LFPAK33's though - have to order, and have to find out what would be the best.
Any ideas on the FET? Is the PSMN2R4-30MLD the best around? Crap - just saw RMM has them (MtnE LFPAK33). Added them to my cart.
Got the LFPAK33's in from RMM, so building one and trimming it down to fit nice in a SolarStorm SC02. Think it's a good match-up for this light. The SC02 here from fasttech is a nice quality small 18650 light, of course with an e-switch. The SC02 is a step-up from my normal e-switch EDC: the ZY-T11 clone from banggood. The ZY-T11 has the advantage of a taking a 26mm DTP MCPCB, and can fit a full size 17mm driver piggyback'ed in, but the overall quality of the SC02 is much better.
“This driver should sand down to 14mm w/out issue. 13mm is too much.”