has expanded from a data interface capable
of supplying limited power to a primary
provider of power with a data interface.
Many devices charge or get their power
from USB ports. The products with USB
connectors for distributing power are
in PCs, laptops, cars, aircraft or wall
socket adapters just to name a few.
USB has become a power socket for many
small devices such as cell phones, MP3
players, flash drives, and other hand-held
devices. Users rely on USB ports to
fulfil their requirements not only in
terms of data but also to provide power
and to charge, their devices.
USB Power Delivery Specification enables
the maximum functionality of USB by
providing more flexible power delivery
along with data over a single cable.
connectors are the same as non-power
delivery connectors except for 2 extra
pins for detecting cables that can carry
higher currents. The power is carried
Power Delivery offers the following
Power up to 100W over the existing USB
Power direction is no longer fixed.
This enables the product with the power
(Host or Peripheral) to provide the
Optimize power management across multiple
peripherals by allowing each device
to take only the power it requires,
and to get more power when required
for a given application.
Intelligent and flexible system level
management of power via optional hub
communication with the PC.
Allows low power cases such as headsets
to negotiate for only the power they
USB Standards website provides the examples
new higher power use cases such as USB
bus powered Hard Disk Drives (HDDs)
and printers. This eliminates the need
for a separate power brick.
2.A monitor with a supply from the wall
can power, or charge, a laptop while
3.USB power bricks or chargers are able
to supply power through a laptopíŽs
4.Laptops and USB power bricks can provide
higher power to battery powered devices
(not currently defined by USB).
5.Battery powered devices can get increased
charging current from a hub and then
give it back temporarily when the useríŽs
HDD requires to spin up.