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Old 08-01-2011, 04:17 PM #1
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Default Need 4V 1.8A From 3.0V Source in a Small Package

I am afraid I am in search of a perfect but non existent 445nm boost driver.

I would like to drive a 445nm at 1.8A with a 3V source capable of 5A continuous discharge. I dont have room for dual microflex or anything like that.

Any ideas?



Last edited by Helios; 08-01-2011 at 04:17 PM.
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Old 08-01-2011, 04:21 PM #2
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Default Re: Need 4V 1.8A From 3.0V Source in a Small Package

3V. I dont even think that is Possible. Even with Duel Flexdrives.

What about Jib77 New Boost Driver.? Have you talked to him about that.?

What are the Dimension of your Host or Project.?
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Last edited by lazeerer; 08-01-2011 at 04:21 PM.
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Old 08-01-2011, 04:31 PM #3
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Default Re: Need 4V 1.8A From 3.0V Source in a Small Package

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Originally Posted by lazeerer View Post
3V. I dont even think that is Possible. Even with Duel Flexdrives.

What about Jib77 New Boost Driver.? Have you talked to him about that.?

What are the Dimension of your Host or Project.?
I didnt know jib was making a boost. I will have to check that out thanks.

The working voltage is 3-3.3V Max charge of 3.6 BUT I am sure it doesnt sustain this while operating.

The host will be the same as the one I used for this build.
Pocket 12x for my own collection - Full Build Pics

I can make the heatsink in a different way to try and maximize space. Actually there will be more room because I will not be using the 3XAAA holder as seen in that build and the battery is a cr123a package so it will give me another half inch or so I think.

Last edited by Helios; 08-01-2011 at 04:35 PM.
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Old 08-01-2011, 04:39 PM #4
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Default Re: Need 4V 1.8A From 3.0V Source in a Small Package

Yep Ricks New Boost Drive Is Here:

FS: Jibs Linear Drivers

He Got it Working. You can See it in later posts. I think he is waiting on Parts too. The Board is a 17mm Board. I thnk he is also working on a smaller size too.

Send him a PM he Will Have better details then i can give you.

Why does it have to be 3v-3.3v.? Why cant you use a 3.7v (4.2v) 18500 if it fits or 16340 and or those 18340 cells.? Or run those 3 10440 cells in Parallel to keep the voltage the same but increase the capacity.?

Cool Host by the way. But very small for 1.8A. Thats going to be a Pocket Rocket for sure.
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Last edited by lazeerer; 08-01-2011 at 04:43 PM.
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Old 08-01-2011, 04:59 PM #5
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Default Re: Need 4V 1.8A From 3.0V Source in a Small Package

Quote:
Originally Posted by lazeerer View Post
Yep Ricks New Boost Drive Is Here:

FS: Jibs Linear Drivers

He Got it Working. You can See it in later posts. I think he is waiting on Parts too. The Board is a 17mm Board. I thnk he is also working on a smaller size too.

Send him a PM he Will Have better details then i can give you.

Why does it have to be 3v-3.3v.? Why cant you use a 3.7v (4.2v) 18500 if it fits or 16340 and or those 18340 cells.? Or run those 3 10440 cells in Parallel to keep the voltage the same but increase the capacity.?

Cool Host by the way. But very small for 1.8A. Thats going to be a Pocket Rocket for sure.
I bought some LiFePO4 16340s that are rated 750mAh and 10C so I hoped I could use them for some very small high power builds. A 18500 li-ion rated at 1400mAh can only provide 2.8A max where as these much smaller 16340s can provide 7.5A no problem. I guess thats a bit overkill but seemed like a good idea at the time.

Also just as an fyi I will be selling these hosts soon. Just need to find some time to get out of work and onto my lathe.

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Old 08-01-2011, 05:09 PM #6
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Default Re: Need 4V 1.8A From 3.0V Source in a Small Package

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Originally Posted by Helios View Post
I bought some LiFePO4 16340s that are rated 750mAh and 10C so I hoped I could use them for some very small high power builds. A 18500 li-ion rated at 1400mAh can only provide 2.8A max where as these much smaller 16340s can provide 7.5A no problem. I guess thats a bit overkill but seemed like a good idea at the time.

Also just as an fyi I will be selling these hosts soon. Just need to find some time to get out of work and onto my lathe.
Why not just use the AW IMR16340. 4A max discharge rate and 4.2V fully charged. They are 550mAh but when draining them @ 2A are you really going to tell that much of a difference between 550mAh and 750mAh. Both are short lived.


AW's LiIon Batteries Sales Thread *Part 12*

And if you don't want to wait for AW to send them from overseas you can get them @ lighthound.
http://www.lighthound.com/AW-IMR1634...ry_p_2626.html

Last edited by DTR; 08-01-2011 at 05:12 PM.
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Old 08-01-2011, 05:17 PM #7
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Default Re: Need 4V 1.8A From 3.0V Source in a Small Package

Quote:
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Why not just use the AW IMR16340. 4A max discharge rate and 4.2V fully charged. They are 550mAh but when draining them @ 2A are you really going to tell that much of a difference between 550mAh and 750mAh. Both are short lived.


AW's LiIon Batteries Sales Thread *Part 12*
Because I have 4 LiFePO4 16340s sitting next to me damn it.

In truth I wanted to try out these LiFePO4 cells so I bought 4 16340 and 8 18650 (18650s are for a 100W LED build)

I didnt realize the voltage difference would be such an issue since they can supply lots of current to boost it higher. Are you guys sure that this voltage will not work? I am trying to load the Microflex PDF so I can see what its min Vin is but it wont display for some reason.


EDIT: It finally loaded. The microflex claims a min Vin of 2V so it should work. I would imagine there is a good chance that other boost drivers out there have similar specs...hopefully.

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Old 08-01-2011, 05:24 PM #8
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Default Re: Need 4V 1.8A From 3.0V Source in a Small Package

Iam Pretty sure that the Voltage will not work. That is too low regardless how much Amps there rated.

I think your best bet is go with a 18500 cell. People use them all the time for High Power builds.

Use the Lifepo4 cells for another project. There not going anywhere.

Edit: Just seen your Edit. Good Luck. But i still dont think it will work at 1.8A with those cells. If it does it will only hold for a couple runs.

But iam interested to see your results. keep us Updated.
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Old 08-01-2011, 05:33 PM #9
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Default Re: Need 4V 1.8A From 3.0V Source in a Small Package

Ok I see what you are saying. Using the (Vout (Volts) * Iout (Amps) ) / Vin (Volts) < 1.2 found in the PDF I get 1.8 so im SOL for that driver at least. So I will probably just have to come up with some other crazy high drain project to use these in...

Thanks for the help guys


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Old 08-01-2011, 05:42 PM #10
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Default Re: Need 4V 1.8A From 3.0V Source in a Small Package

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Originally Posted by Helios View Post
I am afraid I am in search of a perfect but non existent 445nm boost driver.

I would like to drive a 445nm at 1.8A with a 3V source capable of 5A continuous discharge. I dont have room for dual microflex or anything like that.

Any ideas?
you don't have room for 2 micro flexes? creating a nano size laser or something?
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Old 08-01-2011, 05:44 PM #11
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Default Re: Need 4V 1.8A From 3.0V Source in a Small Package

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you don't have room for 2 micro flexes? creating a nano size laser or something?
I *Might* be able to using a 16340. Did you click on the link to the host. It was tricky fitting just one Jib77 driver.

EDIT: I could probably get away with 2 microflex as far as boosting from 3V. Using that same formula I get 1.125 which is < 2 if the dual microflex are set at 900mA each. For cheaper than the price of 2 microflex I just buy one of those AW cells DTR suggested though if there was a 1.8A boost driver out there.

Last edited by Helios; 08-01-2011 at 05:51 PM.
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Old 08-01-2011, 05:52 PM #12
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Default Re: Need 4V 1.8A From 3.0V Source in a Small Package

If your Going to use a 16340 cell Why not Use 18350.?

UltraFire 18350 3.7V 1200mAh Batteries (Pair) - Free Shipping - DealExtreme

They are A tab Longer then a 16340 Maybe 1-2mm and as wide as a 18650 is.

They will have more Mah then a 16340 and should give you a little more run time.
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Old 08-01-2011, 05:57 PM #13
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Default Re: Need 4V 1.8A From 3.0V Source in a Small Package

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Originally Posted by lazeerer View Post
If your Going to use a 16340 cell Why not Use 18350.?

UltraFire 18350 3.7V 1200mAh Batteries (Pair) - Free Shipping - DealExtreme

They are A tab Longer then a 16340 Maybe 1-2mm and as wide as a 18650 is.

They will have more Mah then a 16340 and should give you a little more run time.
With boosting the voltage and average driver losses will a max discharge of 2.4A be enough for 1.8A output? Thats also assuming that the 1200mAh rating is accurate which the Chinese cells rarely are... this is why I was so interested in the LiFePO4.

If it will be enough than I may take that suggestion I was just under the impression it would not be.

Last edited by Helios; 08-01-2011 at 05:59 PM.
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Old 08-02-2011, 03:03 PM #14
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Default Re: Need 4V 1.8A From 3.0V Source in a Small Package

he's choosing the AW IMR 16340 because of the higher discharge current of ~4.4A of the 16340 vs the 2.4A that the 18500 can supply. Also, 18500 won't fit in the space that a 16340 fits.

Last edited by BShanahan14rulz; 08-02-2011 at 03:04 PM.
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Old 08-10-2011, 04:57 PM #15
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Default Re: Need 4V 1.8A From 3.0V Source in a Small Package

What if I went with a small lipo? They are 3.7V nominal and 20C so even a 250mAh cell could do the job for a short while in theory.
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