Texas Instruments makes a rather nice IC designed to produce a split voltage from a DC power source. I'd like to use it to step up a single lithium ion cell (3v-4.1v) to 18v to power a headphone amplifier. Can anyone recommend a good way to use it, and perhaps some filters or a secondary set of linear regulators to reduce noise?
http://focus.ti.com/lit/ds/symlink/tps65130.pdf
http://focus.ti.com/lit/ds/symlink/tps65130.pdf
Thanks, I didn't know about this IC. It looks like the TPS65131 would be the better choice, it has over twice the current capability.
Do you need +/-18v or 18v total (+/-9v)? This IC can only do +/-15v.
I think I will give this IC a try if I can manage to handle the QFN package.
Sorry I don't have any idea about additional filtering.
Do you need +/-18v or 18v total (+/-9v)? This IC can only do +/-15v.
I think I will give this IC a try if I can manage to handle the QFN package.
Sorry I don't have any idea about additional filtering.
I forgot to mention I built a MAX629 boost circuit with a discrete rail slitter some time ago. This was for an OPA552 headphone amp.
If you would like the first test board of the boost circuit I built you are welcome to it.
http://i19.tinypic.com/2j0zcqs.jpg
If you would like the first test board of the boost circuit I built you are welcome to it.
http://i19.tinypic.com/2j0zcqs.jpg
I don't remember exactly. I think I had it set at something like 22V even though the tantalum on the output is only a 20V.
I can adjust it to 18V for you if you would like. I never fully tested how much current it can do and I think I should have used a higher current inductor. It's enough to power two OPA552 to ear splitting levels though.
I can adjust it to 18V for you if you would like. I never fully tested how much current it can do and I think I should have used a higher current inductor. It's enough to power two OPA552 to ear splitting levels though.
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