Negative Regulated Voltage Solution

Use a single rail op amp if possible, vastly easier...
What is the application.
Del

Rail to rail Op-amp is needed as I need +12 to -12 v as analog o/p.

A bit big & not cheap, but very simple:

Traco DC-DC converter TEN8-4822WI

There are also 2 and 3 Watt units

e.g. TEL2-1212 (the outputs are floating, so probably no need for the 1222 ±12)

http://www.tracopower.com/fileadmin/medien/dokumente/pdf/datasheets/tel2.pdf

There is no single chip that will make a DC-DC inverter, for there must be some inductance in the circuit to make the negative voltage. Here is a single chip switching controller that I've used. You will have to add a properly selected inductor, capacitors, sensing resistances and Schottky diode to complete the rest of the inverter package as the data sheet shows. You could instead choose an already designed switching module, as John mentioned earlier.

Another option you might consider, can you possibly use as Del suggested just a single side op-amps but output your signal in an H bridge fashion?

Sorry reply was to 12

Does anybody have simple solution i.e. in single chip solution to have voltage inverter with regulated output.?

You don't really need an inverter.

Here are some simple negative linear regulators:

http://search.digikey.com/scripts/DkSearch/dksus.dll?Selection

Cheap & easy to use.

This I've got to see. How in the world do you get a -12V from a +12V supply by using only a -12V linear regulator. If you look at any of the data sheets for the linear regulators, you will see that their input voltage must be a more negative voltage than the output voltage.

There are inverting charge pump regulator chips that do not require inductors. Switched capacitor converters/regulators can be very useful for low power applications like yours, but I can't find any that meet your voltage requirements.

The PSRR on many op-amps is quite high and I have successfully used unregulated switched capacitors to create a negative supply that approximately tracked an existing positive supply. Not pretty, but it was very low cost and it worked fine in my particular application.

Interesting design. I will likely use these in a future design myself. However, for the OP's application the input and output voltages are wrong for this family of parts. This appears to be an exclusive TI design. I'll bet that with discrete parts this could be used to make larger voltages.

Correction: I found that several other IC fabricators (Maxim, OK semi., National semi., etc.) do make this style of a part but all that I could find so far have similar voltage limitations.

Simplified here, this circuit provides a negative (unregulated) supply up to several mA.

inverting_scc_a1.jpg (sorry, link no longer available)

CD40106 CMOS good up to +15V. Larger voltages and currents are possible using discrete parts, but inductor based switching supplies are usually better for load currents above 100mA.

Yeah, that should work. I'd choose to use some Schottky diodes to minimize the voltage drops. As you imply, this will not be capable of driving a lot of current but most op-amps don't require a lot of current.

I use the LM2574 in just this application (for running a split rail Opamp), As I tend to do most of my "homebrew" on veroboard it helps in that is available in Dip as well as SOIC (surface mount) packages.

I can build the basic circuit on veroboard in an area not much bigger than a postage stamp. Using inductors is not really an (bad) issue, they don't take up much room. I like the look of that charge pump but in the OP's situation it doesn't meet his needs. The LM2574 will provide a regulated -12volt supply from his +12volt supply.

I've used the Traco DC DC supplies and whilst a bit expensive, they do work well. There are other discrete DC DC converter modules around it just depends on the budget and performance tolerance of the OP's design.

Get in touch with:mouser electronics or newark,they carry several input voltages and the outputs you need,in their inverters

but make shure they fit proper output current to operate you divice,it'll be very risky to use you boat's single voltage.

roberspier

Simple, ubiquitous IC that will output +12 and -12 VDC: MAX232. It's an RS-232 driver IC and runs on 5V supply, uses integrated charge pump to produce the output voltages.

http://www.societyofrobots.com/electronics_negative_voltages.shtml

u may use 7912 voltage regulator IC.......it is used to regulate negative voltage -12volt.......7812 IC is used to regulate +12volt.........

... but the 7912 needs a negative input voltage of at least -(12+V_DROPOUT) volts, where V_DROPOUT ≈ 2.5V (though low-dropout versions are available).

I built a powered breadboard once by robbing the power supply from a pc.....

If it's temporary that will do..

can you center tap a 24V transformer and build 2 power supplies, making your center tap the neutral?

you have to single switched capacitor inverter which can convert voltage into its negative equivalent. ADM8828,8829

1. Max input voltage = 5.5V

2. Output is not regulated.

Other than that, it's fine .