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Old 07-31-2013, 04:07 PM #1
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Default BlitzPump: An Open-Source, Buck/Boost for Red Diodes!

Hey everyone. So I was taking a look at some ICs over at Linear Technology and noticed that no one had ever introduced a charge pump driver into the forum. I experimented with them a while back but decided that they probably wouldn't be wanted enough by the forum to warrant the effort of selling them. Then I decided that I should just make them open-source! After all, I am taking the driver basically directly from the datasheet xD

The method of operation of this type of driver is not your typical buck/boost driver. Instead of using an inductor to store energy, it uses something called a "flying capacitor" (sounds like something you'd hear a scientist swear in a cheesy sci-fi movie!) to store energy. Essentially, the driver itself acts as a linear driver, but it increases the input voltage to the necessary amount to drive the load. On the off-state of the driver, the IC draws current enough to charge the capacitor and power the load - it puts the load and flying capacitor in parallel. Then, when it switches on, the capacitor goes in series with the battery, effectively doubling the voltage of the input. With a capacitor on the output, the ripple is smoothed and you get a nice, doubled voltage.

This particular IC is capable of outputting 1x the input voltage, 1.5x the input voltage (clamped at 4.6V) and 2x the input voltage, clamped at 5.1V. That means that, even if you're making your li-ions take a beating and draining them all the way down to 2.7V, it'll still be able to feed 5.1V to whatever diode you need (the remaining voltage will be dropped like in a normal linear driver).

This particular design will be capable of outputting up to 5.1V at 500mA. They are not continuous on the GND path, but most diodes aren't case negative anymore anyways, so I figured that would be fine. This is great for the new Osram 635s and our old 660s because none of those need more than 500mA! Unfortunately, this can't be used to drive a PHR or 12x BR because it can't output enough voltage, but that's okay. We have boosts for those!

Do note that these are not nearly as efficient as standard buck/boost drivers. This is as efficient as a linear driver if you bumped up the voltage to 1x/1.5x/2x the input voltage. But for those that don't care much about efficiency (and who does, with such low-current builds?), these should be great. Tiny foot-print and cheap part list I think will make it a great addition to the forum.

Alright, so here is the schematic file:
.SCH file

And here is the board file:
.BRD file

So a part list!

285mA - 476mA:
1 x LTC3214
3 x 2.2uF 0603-size Ceramic Capacitor
1 x 4.7uF 0603-size Ceramic Capacitor
1 x 7.5k Ohm 0603-size resistor
1 x 5k Bourns Potentiometer, Model TC33

110mA - 288mA:
1 x LTC3214
3 x 2.2uF 0603-size Ceramic Capacitor
1 x 4.7uF 0603-size Ceramic Capacitor
1 x 12.4k Ohm 0603-size resistor
1 x 20k Bourns Potentiometer, Model TC33

That's all, folks! I apologize for not summing it up, but I can assure you that shipping is going to be more expensive than the total order! I apologize for having one part at DigiKey in the 285mA-475mA range. They were only selling that part in quantities of 5000+ at Newark. Enjoy!
Thanks taking the time to read it, I hope this helps the forum!



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Old 07-31-2013, 04:20 PM #2
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Default Re: BlitzPump: An Open-Source, Buck/Boost for Red Diodes!

Man you just don't stop! +1 again when the system allows.

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Old 07-31-2013, 04:22 PM #3
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Default Re: BlitzPump: An Open-Source, Buck/Boost for Red Diodes!

Hah. Thanks! This one's easy though. If you just google LTC3214 (or LTC3215 for a higher-power, more expensive version), you'll find the datasheet. The schematic is right there and they even include a complementary board layout (even though I'll redesign it a bit to make it more space-efficient). I'm literally doing no work besides finding the IC and sticking my name on it! Hah. But BlitzPump is easier to remember than LTC3214 Charge Pump Driver!
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Old 07-31-2013, 06:11 PM #4
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Default Re: BlitzPump: An Open-Source, Buck/Boost for Red Diodes!

Open source! Awesome!

+1 when I can
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Old 07-31-2013, 06:17 PM #5
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Default Re: BlitzPump: An Open-Source, Buck/Boost for Red Diodes!

Awesome! I like that IC. Its even got a built in sense resistor.

Too bad its in a DFN10, I don't think many people will DIY with packages like that. I certainly will order some when you get your files up.

About a year ago made a tiny (7x7mm) charge pump driver based on the MCP1253 for use with phr diodes, but I realized the fb voltage is just too high so I scraped it and never tested it.
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Old 07-31-2013, 07:57 PM #6
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Default Re: BlitzPump: An Open-Source, Buck/Boost for Red Diodes!

Quote:
Originally Posted by benmwv View Post
Too bad its in a DFN10, I don't think many people will DIY with packages like that. I certainly will order some when you get your files up.
Still doable, a stencil from OSH stencils would cost 5$ now, so it's still practical to use a DFN package.
Everything is easier with a stencil.
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Old 07-31-2013, 08:37 PM #7
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Default Re: BlitzPump: An Open-Source, Buck/Boost for Red Diodes!

I had no idea about OSH Stencils o.o I have been ordering stencils for $40 from polulu >.>
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Old 07-31-2013, 08:41 PM #8
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Default Re: BlitzPump: An Open-Source, Buck/Boost for Red Diodes!

They are new, so that might be why.

I made a thread about them here.
OSH stencils

OSH stencils pricing is great - Polulu charges too much
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Old 07-31-2013, 08:42 PM #9
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Default Re: BlitzPump: An Open-Source, Buck/Boost for Red Diodes!

Oh, Im gonna get some of those! Awesome find.
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Old 07-31-2013, 08:44 PM #10
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Default Re: BlitzPump: An Open-Source, Buck/Boost for Red Diodes!

^ Yeah, I was stoked when I found them

I got one stencil made and I was impressed with the quality.

Going to have to grab a stencil for everything now.
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Old 08-01-2013, 04:34 AM #11
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Default Re: BlitzPump: An Open-Source, Buck/Boost for Red Diodes!

Alright, so I threw together a design. Should be pretty robust. It's double-sided, but that shouldn't be a problem. Anyone have any recommendations on current settings? The way this IC functions, it would be hard to get a linear change throughout most of its operating range. I suppose I could throw together a parts list for several ranges?

EDIT: All of that stuff added to the OP! Enjoy.

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Old 08-01-2013, 04:56 AM #12
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Default Re: BlitzPump: An Open-Source, Buck/Boost for Red Diodes!

Sweet! I esp. like the name BlitzPump

+1
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Old 08-01-2013, 05:01 AM #13
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Default Re: BlitzPump: An Open-Source, Buck/Boost for Red Diodes!

Thanks!
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Old 08-01-2013, 05:44 AM #14
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Default Re: BlitzPump: An Open-Source, Buck/Boost for Red Diodes!

Very nice, thanks for sharing! +1
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Old 08-01-2013, 06:44 AM #15
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Default Re: BlitzPump: An Open-Source, Buck/Boost for Red Diodes!

No problem! Only took like 15 minutes to throw it together!
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Old 08-01-2013, 08:43 AM #16
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Default Re: BlitzPump: An Open-Source, Buck/Boost for Red Diodes!

I made a fork of this exclusively for the single mode pl450b diodes. Its got three pads on one side that attach right to the pins, then the pos input pad on the other side for a spring or wire.

I believe they are around 4.5v right? I haven't made a laser with one yet, and this charge pump circuit is the perfect driver if they are.

Also this is only 5.5 mm wide! and 8mm long. So it will actually be a bit thinner than a standard 5.6mm diode. Imagine holding a driver that small.



I don't think wolf mentioned it, but his original is only 8x8mm! I switched out for 0402 and switched holes for pads to cut it down, not that it needed it haha.

What do you think wolf? This chip is great!
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