> 7805
> http://www.st.com/stonline/products/literature/ds/2143.pdf
> page34/56 fig27 max35V input

I've also seen an application where the 7805 is used as a high
voltage (pre-)regulator, taking advantage of the differential voltage
range between I and A (often labelled Ground). ie raising A also
raises the upper range of I, but O still has to be within spec limit

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