Adaptive rapid charging is the latest in USB battery charging technology that can charge devices 75% faster than conventional chargers. At the forefront of this technology is Qualcomm's Quick Charge 2.0 protocol. Quick Charge 2.0 works by detecting commands from Quick Charge 2.0 enabled devices, such as a cellphones and tablets, and adjusting the output voltage of the AC-DC charger to increase power delivery to the device’s battery.
To meet the need for adaptive rapid charging systems, Power Integrations has developed the "ChiPhy" (charger physical interface) family of ICs. Used in combination with one of Power Integrations' AC-DC switcher ICs, such as TOPSwitch or TinySwitch, ChiPhy ICs add adaptive rapid charging functionality to AC-DC wall chargers.
The first in Power Integrations' line of ChiPhy ICs is the CHY100, specifically design to work with Quick Charge 2.0. If a device is not Quick Charge 2.0 compliant, the ChiPhy IC disables output voltage adjustment to ensure safe operation.