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What is your rating current?
For low output current rating (<10 watts) best choice is Linear regulator (LM723)
For high output current rating (>10 watts) best choice is switching regulator
(buck regulator)
This 7.2 is not very high for the 5 V output, LM2575 or 2676, 2678 but you can have a problem with low input voltag, for this chip 8 is a normal. Hve many other solution, but all is depent from current. Maxim have a good DC/DC converters, TI also have. MC34063 is a good solution for small power.
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