Which one of these 2 dc-dc converters is better?

[sonicares]

$6.30 - VMP3203-5V High Efficiency DC-DC Module - DIY Parts & Components

$5.90 - VMP3202-5V High Efficiency DC-DC Module - DIY Parts & Components

AFAIK, one of them shoots out 3amp, the other 2 amps.

 

[Para]

How in the world would you connect those for ecigs?

 

[sonicares]

How in the world would you connect those for ecigs?

Well..that was going to be my next question..1 step at a time..or did i put the horse before the cart? LMAO

 

[Para]

Well..that was going to be my next question..1 step at a time..or did i put the horse before the cart? LMAO

You should probably stick with tried and true parts if you don't know what you are attempting to use and how to use it.

 

[sonicares]

You should probably stick with tried and true parts if you don't know what you are attempting to use and how to use it.

I was going to but unfortunately can't seem to find the digikey/TI parts in the UK

 

[VpnDrgn]

Those are the main chip and are supposed to be soldered to a pcb with other components.

See this lm2596 DC - DC step down converter? The lm2596 applies to the main chip component on the board.
LM2596 DC-DC Step Down Adjustable Power Supply Module | eBay

 

[breaktru]

Those are the main chip and are supposed to be soldered to a pcb with other components.

See this lm2596 DC - DC step down converter? The lm2596 applies to the main chip component on the board.
LM2596 DC-DC Step Down Adjustable Power Supply Module | eBay

VpnDrgn, that dang is big, ya need a big box for that.

Numbers a good though

 

[VpnDrgn]

What, it's only 2"x1"x1/2". Besides, I am not quite savvy enough to build my own board, and Mamu has proved this is an easy way to build
a VV box. I've tried asking the "experts" but they usually either don't answer or answer with tech speak. *cough*breaktru*cough*

 

[breaktru]

ohhh that hurt
Okay u win, no parts to add. I'm obsessed with putting things in tight spaces

 

[VWFringe]

I'd go with the one that's rated up to three amps, as I have figured I've gotten up to 2.24 amps using 5.2 volts with a 2.3 ohm atty

i know usually people only talk about up to 2 amps, but i'd use the one that's rated for three
prolly same thing with beefier heat sink anyway
if the soldering doesn't scare you, it looks pretty trick for a radio shack type part (i mean looks-wise, not judging the internals)

 

[AriM]

the chips in the original post are BGA, smd's.....they require a reflow station or oven. if you have never done BGA surface mount, I would stay far far away from those....you need about $400, worth of tools to properly/consistently solder those chips. It can be done with a heat gun and or toaster oven....but if you aren't willing to screw up a few times then forget it. Also you would need the correct pitch SMB pcb for them. I didn't bother to check the lead pitch, but trust me on this one. It's more trouble than it's worth, and there are better chips out there....for about the same money. Stick with through hole IC's.