Definition: USB Power Delivery

USB Power Delivery (USB PD) provides the rules for generating power using USB-C cables, which have the extra wire over which USB PD communicates. USB PD defines five levels as follows. For example, a USB port rated at 50 watts supports 3 amps at 5, 9 and 15 volts, as well as 2.5 amps at 20 volts (50 divided by 20). See USB power, USB Type C and PoweredUSB.

   POWER DELIVERY RULES
                    Maximum Amps at
   Rating           these voltages:
   (Watts)       5v    9v    15v   20v

 .5 =< x =< 15  x/5A

 15 =< x =< 27   3A    x/9A

 27 =< x =< 45   3A    3A    x/15A

 45 =< x =< 60   3A    3A    3A    x/20A

 60 =< x => 100  3A    3A    3A    x/20A**

  ** Requires 5A cable

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