Worst-case voltage drop topology of a USB 3. x host to device chain, at steady state. Note that under transient conditions the supply at the device can momentarily drop from 4.0V to 3.67V. Allowable current draw [ edit ] USB power standards USB ports and connectors are often color-coded to distinguish their different functions and USB versions. These colors are not part of the USB specification and can vary between manufacturers; for example, the USB3.0 specification mandates appropriate color-coding while it only recommends blue inserts for Standard-A USB3.0 connectors and plugs. [8] Connector types [ edit ] ID Pin Resistance on Mini B-plugs and Micro B-plugs Increased to 1 Mohm". USB IF Compliance Updates. December 2009. Archived from the original on 20 July 2011 . Retrieved 1 March 2010. Mini-USB connectors were introduced together with USB 2.0 in April 2000, for use with smaller devices such as digital cameras, smartphones, and tablet computers. The Mini-A connector and the Mini-AB receptacle connector have been deprecated since May 2007. [11] Mini-B connectors are still supported, but are not On-The-Go-compliant; [12] the Mini-B USB connector was standard for transferring data to and from the early smartphones and PDAs. Both Mini-A and Mini-B plugs are approximately 3 by 7mm (0.12 by 0.28in). The Mini-AB receptacle accepts either a Mini-A or Mini-B plug. In May 2021, the USB PD promoter group launched revision 3.1 of the specification. [58] Revision 3.1 adds Extended Power Range (EPR) mode which allows higher voltages of 28, 36, and 48 V, providing up to 240 W of power (48 V at 5 A), and the "Adjustable Voltage Supply" (AVS) protocol which allows specifying the voltage from a range of 15 to 48 V in 100 mV steps. [71] [72] Higher voltages require electronically marked EPR cables that support 5 A operation and incorporate mechanical improvements required by the USB Type-C standard rev. 2.1; existing power modes are retroactively renamed Standard Power Range (SPR). In October 2021 Apple introduced a 140 W (28 V 5 A) GaN USB PD charger with new Macbooks. [73]

Broad Manufacturer Agreement Gives Universal Phone Cable Green Light" (Press release). OTMP. September 17, 2007. Archived from the original on June 29, 2009 . Retrieved November 26, 2007. USB Type-B ports are roughly square, rather than being a narrow slot like Type-A. The upper corners of the square USB Type-B connector (and its corresponding USB-B plugs) are slightly angled. This means the receptacle will only accept a connection when the male part is orientated the right way up. Europe gets universal cellphone charger in 2010". Wired. June 13, 2009. Archived from the original on August 18, 2010 . Retrieved June 22, 2010. a b Howse, Brett (August 12, 2014). "USB Type-C Connector Specifications Finalized". Archived from the original on December 28, 2014 . Retrieved December 28, 2014.An industrial connector is typically one that is designed for extremely hard-wearing use in a more challenging environment. This might include versions designed with: Lex Friedman (25 February 2013). "Review: Logitech's Ultrathin mini keyboard cover makes the wrong tradeoffs". macworld.com. Archived from the original on 3 November 2013 . Retrieved 29 October 2013. USB Power Delivery" (PDF). usb.org. USB-IF. October 20, 2016. Archived from the original (PDF) on December 20, 2016.

The Wireless Association Announces One Universal Charger Solution to Celebrate Earth Day" (Press release). CTIA. 22 April 2009. Archived from the original on 14 December 2010 . Retrieved 22 June 2010.Universal Serial Bus 2.0 Specification, Section 7.2.1.4 High-power Bus-powered Functions" (ZIP). usb.org. 27 April 2000. Archived from the original on 10 September 2013 . Retrieved 11 January 2014. As of 14June2007 [update], all new mobile phones applying for a license in China are required to use a USB port as a power port for battery charging. [83] [84] This was the first standard to use the convention of shorting D+ and D− in the charger. [85] OMTP/GSMA Universal Charging Solution [ edit ] USB PD continues the use of the bilateral 5% tolerance, with allowable voltages of PDO ±5% ±0.5V (eg. for a PDO of 9.0V, the maximum and minimum limits are 9.95V and 8.05V, respectively). [42] Battery Charging Specification, Revision 1.1". USB Implementers Forum. April 15, 2009. Archived from the original on March 29, 2014 . Retrieved September 23, 2009. On-The-Go and Embedded Host Supplement to the USB Revision 3.0 Specification" (PDF). USB.org. Revision 1.1. May 10, 2012.