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Thread: USB to "cigarette lighter" plug power adapter?
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Old Mar 9, 2008 | 11:51 am
  #11  
dgwright99
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Originally Posted by bdjohns1
I'm pretty sure that's impossible without violating the USB spec. IIRC, the spec allows 5V and 500 mA (2.5 watts). Your average laptop wants 45-90 watts.
More to the point, the USB spec specifically prohibits suppling current "upstream" - ie into a PC.
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