Question about a VV mod.

[Akya2120]

Could this chip be used in a dual 18650 VV mod?

Digi-Key - LTM4609EV#PBF-ND (Manufacturer - LTM4609EV#PBF)

It's 98% efficient. The hard part seemingly would be soldering. Maybe I'd have to get them produced?

Thanks for your help.

 

[MasterofChaos]

Dude, its virtually impossible to solder BGAs (that's the package this chip comes in) by hand.

I'm pretty experienced (not to toot my own horn or anything), but I wouldn't even attempt it.

Try to use a chip that has leads on it, otherwise a the very least your are going to need a microscope.

 

[Akya2120]

If I have them produced in a factory though this would work? I can't find anything with leads that does what I'm looking for. I emailed TI, so hopefully they can help me find the chip I'm looking for.

 

[drewk302]

very expensive

 

[breaktru]

Did you check out the price of that chip??? After looking at the price, I went no further. Didn't even view the spec's.

 

[Java_Az]

IT would work but soldering is going to be a issue. To do it at home you would need a hot air rework station. A board pre warmer is also going to be needed. Even then it is not a easy package to work with because the pads are so small and not hand solderable since all the pads are on the bottom of the chip. You will also have to design the circuit that chip requires some added components. Learn how to make your own circuit boards with your designed circuit is also a must if you want to do it all at home. So it can be done but it for sure is not going to be easy starting from scratch. Submitting your design to a company will make and solder on your components is pretty expensive but not too bad. the more boards you buy the cheaper it gets. But your still going to have to learn a PCB circuit design program which that in it self can take quite a bit of time. You could get a place to design the circuit too. But thats going to make it even more pricey. Having said all that you might want to look at other options out there in packages that are easier to solder.

 

[drewk302]

I like my free samples.....that is a good price for me!

 

[Akya2120]

Ok been looking around. How about this IC?

Digi-Key - LM5118MH-ND (Manufacturer - LM5118MH/NOPB)

Would that work for a VV mod with two 18650s?