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Old 10-10-2011, 05:04 PM #1
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Default check this out from national semicon...

wow... check what I found... maybe a new driver coming our way with this:

SIMPLE SWITCHER Nano Module Demo

ULTRA SMALL, ULTRA EFFICIENT SWITCHING REGULATOR with INTEGRATED SOFT-START
INTEGRATED INDUCTOR!!! WOW!!
UP TO 1A with LOW RIPPLE AND NOISE!

i just thought it might inspire someone to make the smallest driver in a handheld


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Old 10-10-2011, 05:30 PM #2
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Default Re: check this out from national semicon...

Very impressive !
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Old 10-10-2011, 05:43 PM #3
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Default Re: check this out from national semicon...

Oooh sweet.
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Old 10-10-2011, 06:13 PM #4
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Default Re: check this out from national semicon...

So that would be useful for... driving REDs from a single lithium ion?

2x lithium ions would provide higher than the max VIN of that IC, and with 1x lithium ion you would be limited to diode with a Vf lower than 3.7V.

This would be amazing if it was capable of boosting!
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Old 10-10-2011, 06:32 PM #5
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Default Re: check this out from national semicon...

Quote:
Originally Posted by rhd View Post
So that would be useful for... driving REDs from a single lithium ion?

2x lithium ions would provide higher than the max VIN of that IC, and with 1x lithium ion you would be limited to diode with a Vf lower than 3.7V.

This would be amazing if it was capable of boosting!
oh drat... I didn't see that I was pretty excited
anyway here is a boost alternative that looks sweet too

LMR62421 - SIMPLE SWITCHER 24Vout, 2.1A Step-Up Voltage Regulator in SOT-23 and LLP

it's pretty new 03.10.2011(not on the market yet) but when it gets out I will buy some for testing !!!

Last edited by foulmist; 10-10-2011 at 06:39 PM.
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Old 10-10-2011, 06:40 PM #6
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Default Re: check this out from national semicon...

Do we know when the LMR62421 will be out?

That looks fairly promising. 8 components by my count. 2A output ability. SOT-23 package is doable for DIY drivers.

With a little better documentation in their final datasheet, I think even I could design a boost driver
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Old 10-10-2011, 06:54 PM #7
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Default Re: check this out from national semicon...

i still have no idea... but I will keep track on this and on other new products
will let you know when it's out hope it's soon
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Old 10-10-2011, 08:14 PM #8
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Default Re: check this out from national semicon...

From National a few minutes ago:

"[T]he LMR62421 part should be available in aprox. 6 weeks."
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Old 10-10-2011, 08:28 PM #9
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Default Re: check this out from national semicon...

I will definitely pick up some of these when they come out!

Looks like it's pin compatible with lm3410, I already have a board designed to put it on!

Edit: actually no it's not any good It's switch current is 2.1A so you may get 1Amp out of it boosting to a 445.

It looks like it's exactly the same as the lm3410 but with a lower switch current.

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Old 10-10-2011, 08:30 PM #10
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Default Re: check this out from national semicon...

Quote:
Originally Posted by benmwv View Post
Looks like it's pin compatible with lm3410, I already have a board designed to put it on!
You have a working boost driver board, and you're not sharing that marvelous creation with the community!?
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Old 10-10-2011, 08:37 PM #11
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Default Re: check this out from national semicon...

Quote:
Originally Posted by rhd View Post
You have a working boost driver board, and you're not sharing that marvelous creation with the community!?
Still in test phase! It should be done very soon. Remember that one I showed you a few months ago? It's that one.

See my edit^
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Old 10-11-2011, 05:24 AM #12
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Default Re: check this out from national semicon...

so lm3410 should be better?
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Old 10-11-2011, 06:04 AM #13
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Default Re: check this out from national semicon...

Yeah it's got 2.8A max switch current compared to this with 2.1A, and everything else seems identical.
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Old 10-11-2011, 12:37 PM #14
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Default Re: check this out from national semicon...

Do you guys want to open up an LM3410 "community design" ?

I was going to try my hand at designing a boost using that IC myself. I think it would be cool to do that out in the open-source. It doesn't look too daunting. Would be pretty cool to have a DDL-esque design out in the open that anyone could use!
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Last edited by rhd; 10-11-2011 at 12:38 PM.
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Old 10-11-2011, 12:43 PM #15
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Default Re: check this out from national semicon...

hey RHD, I actually have a board wtih LM3410 at home, but I couldn't get it outputing more than 600mA at 4.2V input 5.5V output... I think it's the inductor or maybe not so I left it as is,

I used 3A 4.7uH, it's quite large, but i think i must try some other inductor values and post results... I am pretty much free after work this week so I think I will have time to make another board... unless I get started with the dichros I got will posts results too
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Old 10-11-2011, 12:51 PM #16
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Default Re: check this out from national semicon...

I can't say too much before I get copyright on my product.... but my driver which is in DEV, will have very similar components, but of higher quality than the ones mentioned in this thread
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