Switching power supply for ROBOT

I am searching for good components to design a
switching ps DC/DC converter. Powered by 12V
car battery. I need plus twelve, minus twelve,
plus five, minus five volts to power onboard
computer. I see that Maxim has some switching
regulators, but don't know which to choose.
current requirements for -12 are .3 amps. +12
is about 2 amps. +5 about 6 amps. -5 2 amps.
Are there available schematics on the network or
commercial units available?
Pleasse don't email. Just post. Spam filter on
hotmail cuts just about everyone off.
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