Draft:Pump Express
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MediaTek Pump Express is a rapid charging technology for mobile devices developed by MediaTek.
The 2014 and 2015 versions of Pump Express, Pump Express Plus and Pump Express Plus 2.0, differ from Qualcomm Quick Charge by communicating voltage requests to the charger using current modulation signals through the main USB power lanes (VBUS) rather than negotiating through the USB 2.0 data lanes.[http://cdn-cw.mediatek.com/Features/Pump%20Express%20Series%20Introduction.pdf Mediatek Pump Express Introduction (2016)]
Pump Express Plus supports elevated voltage levels of 7, 9 and 12 volts.
Pump Express Plus 2.0 supports finer-grain voltage levels. Those of Pump Express Plus 2.0 are between 5 volts and 20 volts, with half a volt between each step (5.0{{nbsp}}V, 5.5{{nbsp}}V, 6.0{{nbsp}}V, …, 19.5{{nbsp}}V, 20.0{{nbsp}}V). However, the wider voltage range of Quick Charge 3.0 starts at 3.6 volts with 0.2 volts between each step and goes up to 22 volts (3.6{{nbsp}}V, 3.8{{nbsp}}V, 4.0{{nbsp}}V, …, 21.8{{nbsp}}V, 22{{nbsp}}V).http://i.mediatek.com/hubfs/MtkSpecSheet_v2.pdf[https://d86o2zu8ugzlg.cloudfront.net/mediatek-craft/documents/Pump-Express-Plus.pdf Pump Express Plus — MediaTek Technology White Paper (April 2015)]