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I need to save space on PCB and have to convert voltage from +48 to +9, -9 and virtual ground. Is there a single IC that could do that?

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At what power output? – BullBoyShoes Mar 29 '11 at 11:49
the current is really small, several miliamps – miceuz Mar 30 '11 at 11:06

2 Answers

up vote 3 down vote accepted

You could do it, for just a few milliamps, with two zeners and a resistor.

If you did it this way you could probably get away with a 1206 SMD resistor (0.5W) and a dual series SOT23 zener, in total smaller than most linear regulator packages. Here is a possible circuit (output is 9.1V per rail):

      ____
48V -|10k_|-+-- 9V
            |
         |__|__
           / \ |  9.1V
          /___\
            |
            |
            +-- GND
            |
         |__|__
           / \ |  9.1V
          /___\
            |
Source COM -+-- -9V
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i did exactly that, worked perfect: blog.hardcore.lt/mic/archives/010942.html – miceuz Apr 6 '12 at 23:47
up vote -1 down vote

You need a DC/DC converter. I suggest browsing the following websites where you should find something suitable

http://www.mornsun-power.com/cn/Index.html

http://www.xppower.com/

http://www.murata-ps.com/

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Those sites don't seem to offer components (question seeks to save space), let alone small, low-power, board-level modules. Also, given some fairly specific requirements it's a very vague answer. – Nick T May 3 '11 at 1:57
The question actually asks for a single IC that will do it, not components - should I downvote the other answer? The links will give you a solution, if you take the time to look through properly – BullBoyShoes May 3 '11 at 11:52
Thomas' solution was compact, even if it wasn't a single IC per se. Since it answers the spirit of the question, if not the letter, it probably doesn't need a downvote. In any case, this discussion should be a comment to that answer. – Kevin Vermeer May 3 '11 at 13:29
@Nick T - Those sites certainly do offer components and low-power board-level modules. I found compatible modules from Mornsun, XPPower, and Murata. I agree that the answer could do more to flesh out the search process, but there's no need to downvote it. – Kevin Vermeer May 3 '11 at 13:36
FWIW I`m not into spoon feeding people answers, a pointer in the right direction will certainly help in the long run :-) – BullBoyShoes May 3 '11 at 20:14

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