more current at the output than what is coming in
was going to suggest the national semiconductor "simple switcher" till you mentioned the 'more current'.
Depending on your electronic capabilities, to get more current you will need to use a step down xfmr and a pwm chip like the UC1846 and a push pull or forward converter topology.
You can get a little more current out than in on a near classical buck circuit if the input voltage is lots higher and you put a big capacitor at the input, but nothing like doubling the current.
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