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Old 08-25-2011, 12:56 AM #1
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Default LM2623 -0.8V~14Vin/1.24V~14Vout at 2 Amps

Has any one looked at these yet

LM2623

General Purpose, Gated Oscillator Based, DC/DC Boost Converter
4mm x 4mm Thermally Enhanced LLP Package Option
LM2623 - General Purpose, Gated Oscillator Based, DC/DC Boost Converter


definately a group buy at 1000 pieces

or buy 1 for $2.31
Order LM2623 Power Management DC to DC Converter Parts Online, Download Datasheets, View Manufacturer Info at Avnet Express


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Old 08-27-2011, 07:13 PM #2
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Default Re: LM2623 -0.8V~14Vin/1.24V~14Vout at 2 Amps

This does sound like a useful little gadget.

Id be interested in it.

Could you use this in place of an LM317 all things considered

Last edited by ChukiDori; 08-27-2011 at 07:14 PM.
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Old 08-27-2011, 07:54 PM #3
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Default Re: LM2623 -0.8V~14Vin/1.24V~14Vout at 2 Amps

This is a Boost DC/DC converter...
The LM317 is a Linear Regulator...
Not the same species...


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Last edited by lasersbee; 08-27-2011 at 07:55 PM.
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Old 08-27-2011, 08:06 PM #4
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Default Re: LM2623 -0.8V~14Vin/1.24V~14Vout at 2 Amps

Oh sorry. Just looking for options after no one at radio shack could help me with parts for an LM317 based circuit today ^_^
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Old 08-28-2011, 12:02 AM #5
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Default Re: LM2623 -0.8V~14Vin/1.24V~14Vout at 2 Amps

After reviewing the data sheet it appears that it does NOT regulate current at all. It's simply a DC/DC boost voltage regulator. For a moment I thought about possibly using it to feed an LM317, LM350 or LM1117 from a single lithium cell, but after looking at the efficiency vs. Vin graph it would not be very efficient at all with a Vin of 3.2v-4.2v and a Vout of 7.2v-9v (needed to feed an LMXXX) at any reasonable current needed to drive a 405nm or 445nm diode.
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Old 08-28-2011, 02:21 AM #6
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Default Re: LM2623 -0.8V~14Vin/1.24V~14Vout at 2 Amps

Quote:
Originally Posted by ChukiDori View Post
Oh sorry. Just looking for options after no one at radio shack could help me with parts for an LM317 based circuit today ^_^
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Old 10-05-2011, 11:46 PM #7
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Default Re: LM2623 -0.8V~14Vin/1.24V~14Vout at 2 Amps

What about this one: LM2940

I read that it had a 0.5 drop out voltage. But i looked at the pin configuration and its diferent from the lm317.
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Old 10-07-2011, 05:13 PM #8
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Default Re: LM2623 -0.8V~14Vin/1.24V~14Vout at 2 Amps

The LM2940 has a fixed voltage output. You can't use that one for a current regulator.
Look for: LM1085-ADJ, LMS1585-ADJ or similar types with a 1.25Vref. Then you can use the same formulas for calculating the current. If you are not sure post here or PM me.
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Old 10-07-2011, 05:27 PM #9
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Default Re: LM2623 -0.8V~14Vin/1.24V~14Vout at 2 Amps

Quote:
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Does anyone need any PCB design done? I love working with circuit layouts.

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Old 10-07-2011, 05:27 PM #10
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Default Re: LM2623 -0.8V~14Vin/1.24V~14Vout at 2 Amps

You could use this to drive an STCS1 - might be a good combination
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