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
Power Delivery Battery Logos
These logos indicate that the USB port supports Power Delivery. The numbers are the SuperSpeed version (see
USB).