At the link Luciano posted, you can also find LTC2970.
I did not check for 0-30V versions.
Dual I2C Power Supply Monitor and Margining Controller.
Here I attached two sample applications for your ref.
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<img src="http://img10.picsplace.to/18/LTC1.GIF" alt="Image Hosting by PicsPlace.to" >
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<img src="http://img10.picsplace.to/18/LTC2.GIF" alt="Image Hosting by PicsPlace.to" >
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