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Old 15th October 2005, 01:43 PM   #1
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Default supply-splitting: TLE2426 alternatives?

Hello!

I want a dual supply from a single battery. In my previous circuit, I was very happy with the TLE2426 from TI, but now I'm searching a solution in SMT, which wil require few space.
Are there other (good) single chip solutions which can be used to power an op-amps?
The circuit to power is a stereo mic preamp and draws 6mA or less, with a voltage between +-1.5V and +-4.5V.
...
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Old 15th October 2005, 01:46 PM   #2
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... If not, I think about using a simple circuit like the following, just with an op-amp with less current consumption. If possibly someone had hints on improving the circuit I'd be thankful too!

Thanks for reading!
Cheers
Dominique

PS. circuits are taken from http://tangentsoft.net/audio/
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Old 15th October 2005, 04:38 PM   #3
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What is R1 for? Stability?

There are probably solutions available from Maxim (they make some very tiny packages...)

But otherwise, the TLE2426 is available in SOIC package!

Go see there:

http://focus.ti.com/docs/prod/folder...t/tle2426.html
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Old 15th October 2005, 06:55 PM   #4
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oups! That's good news!

I was so sure it only existed in DIP and TO!
Probably I forgot about SOIC because when I checked the datasheet, I saw a 14pin SOIC package and didn't understand why - but in fact the package is SOIC8 and the drawing was just meant to be symbolic for the package type - silly me!

Thanks a lot for clarifying this for me, Wizard!

But, well, as three pins are NC, they could have packed it in a 5-pin package!
If anyone still can point me at other (maybe even more space economic) solution, I'd be thankful!

And, what R1 in the second schematic is for, I don't know, I found that circuit on the given site! I imagine that it is for damping the regulation.

Cheers!
Dominique
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Old 15th October 2005, 07:24 PM   #5
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Quote:
Originally posted by Dominique
If anyone still can point me at other (maybe even more space economic) solution, I'd be thankful!
I'm almost certain Maxim makes stuff that you'd like. I don't have much time roaming around their site, but go see there: http://www.maxim-ic.com/

They have a lot of components that are meant for battery-operated circuits in space-saving packages... So virtual grounds and inverters should be in their offering...

Quote:
And, what R1 in the second schematic is for, I don't know, I found that circuit on the given site! I imagine that it is for damping the regulation.
I'd venture it is there to prevent oscillation; although I'm not sure what kind of oscillation could happen with a slow AOP in unity gain...
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Old 15th October 2005, 07:33 PM   #6
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I've just found one over at Maxim's, but it's way noisier than TI's IC... http://www.maxim-ic.com/appnotes.cfm...te_number/1199

I'll continue by checking the other popular IC makers...

Thanks again,
Dominique
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Old 28th February 2007, 04:25 AM   #7
e39er is offline e39er  United States
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Default TLE2426 Simulation

Has anyone tried simulating this circuit? I tried it but did not correctly get a split voltage. What leads should I be measuring against?
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Old 28th February 2007, 05:57 AM   #8
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Quote:
Originally posted by Dominique
And, what R1 in the second schematic is for, I don't know, I found that circuit on the given site! I imagine that it is for damping the regulation.
(R1 = 10 ohms) It's for some protection but makes also the opamp less sensitive against capacitve load.
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