USB Power Delivery (UPD)
USB PD rev. 1 source profiles
Profile +5 V +12 V +20 V
1 2.0 A, 10 W[a] No No
2 1.5 A, 18 W
3 3.0 A, 36 W
4 3.0 A, 60 W
5 5.0 A, 60 W 5.0 A, 100 W
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USB PD rev. 2 source power rules
power (W) Current, at: (A)
+5 V +9 V +15 V +20 V
0.5–15 0.1–3.0 No No No
(15 W) 1.7–3.0
(27 W) 1.8–3.0
(45 W) 2.25–3.0
In July 2012, the USB Promoters Group announced the finalization of the USB Power Delivery (PD) specification, an extension that specifies using certified PD aware USB cables with standard USB Type-A and Type-B connectors to deliver increased power (more than 7.5 W) to devices with larger power demand. Devices can request higher currents and supply voltages from compliant hosts – up to 2 A at 5 V (for a power consumption of up to 10 W), and optionally up to 3 A or 5 A at either 12 V (36 W or 60 W) or 20 V (60 W or 100 W). In all cases, both host-to-device and device-to-host configurations are supported.
The intent is to permit uniformly charging laptops, tablets, USB-powered disks and similarly higher power consumer electronics, as a natural extension of existing European and Chinese mobile telephone charging standards. This may also affect the way electric power used for small devices is transmitted and used in both residential and public buildings.
The Power Delivery specification defines six fixed power profiles for the power sources. PD-aware devices implement a flexible power management scheme by interfacing with the power source through a bidirectional data channel and requesting a certain level of electrical power, variable up to 5 A and 20 V depending on supported profile. The power configuration protocol uses a 24 MHz BFSK-coded transmission channel on the VBUS line.
The USB Power Delivery revision 2.0 specification has been released as part of the USB 3.1 suite. It covers the Type-C cable and connector with four power/ground pairs and a separate configuration channel, which now hosts a DC coupled low-frequency BMC-coded data channel that reduces the possibilities for RF interference. Power Delivery protocols have been updated to facilitate Type-C features such as cable ID function, Alternate Mode negotiation, increased VBUS currents, and VCONN-powered accessories.
As of USB Power Delivery Revision 2.0 Version 1.2, the six fixed power profiles for power sources have been deprecated. USB PD Power Rules replace power profiles, defining four normative voltage levels at 5V, 9V, 15V, and 20V. Instead of six fixed profiles, power supplies may support any maximum source output power from 0.5W to 100W.
Status of available product: Currently (April, 2016) there are silicon controllers available from several sources (TI, Cypress)  and several others. Power supplies bundled with Type-C based laptops from Apple, Google, HP, Dell, and Razer support USB PD. In addition, accessories from third party vendors including Anker, Belkin, iVoler and Innergie support USB PD 2.0 at multiple voltages. There are several PD aware projects such as the USB-PD Sniffer that are PD aware. ASUS also make a fully Power Delivery compliant adapter card the USB 3.1 UPD PANEL
Power Delivery implementation on 2015 or newer HP commercial notebooks and adapters
USB Type-C power delivery allows HP computers to deliver a higher current output at different output voltages. The power delivery output and voltage will vary based on the capabilities of the computer or device.
Hosts or computers
2015 HP commercial notebooks deliver 5V of output voltage.
Some computers support delivering a maximum current of 1.5A or 3A, but do not support 5A.
Some 2015 HP commercial notebooks can draw power from an external device (i.e. AC Adapter) at different input voltages such as 5V, 12V, 20V voltages.
The computer will adjust the output capability based on system power conditions. For example, an HP Elitebook will provide power at 5V@3A. The computer can change the output power to 5V@1.5A or 5V@900mA in certain conditions.