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2. USB-C - Wikipedia

   en.wikipedia.org/wiki/USB-C

   The USB-C port can be used to connect wired accessories such as headphones. There are two modes of audio output from devices: digital and analog. There are primarily two types of USB-C audio adapters: active, e.g. those with digital-to-analog converters (DACs), and passive, without electronics. [91] [92]

3. Quick Charge - Wikipedia

   en.wikipedia.org/wiki/Quick_Charge

   Quick Charge is a proprietary technology that can charge battery-powered devices, primarily mobile phones, at power levels exceeding the 7.5 watts (5 volts at 1.5 amps) supported by the USB BC 1.2 standard, using existing USB cables. The higher voltage available allows more power (watts) to be supplied through wires without excessive heating.

4. USB hardware - Wikipedia

   en.wikipedia.org/wiki/USB_hardware

   To allow for voltage drops, the voltage at the host port, hub port, and device are specified to be at least 4.75 V, 4.4 V, and 4.35 V respectively by USB 2.0 for low-power devices, [a] but must be at least 4.75 V at all locations for high-power [b] devices (however, high-power devices are required to operate as a low-powered device so that they ...

5. Boost converter - Wikipedia

   en.wikipedia.org/wiki/Boost_converter

   A boost converter or step-up converter is a DC-to-DC converter that increases voltage, while decreasing current, from its input to its output . It is a class of switched-mode power supply (SMPS) containing at least two semiconductors, a diode and a transistor , and at least one energy storage element: a capacitor , inductor , or the two in ...

6. Battery charger - Wikipedia

   en.wikipedia.org/wiki/Battery_charger

   They may be fully compliant USB peripheral devices or uncontrolled, simple chargers. Another type of USB charger called "USB (rechargeable) battery" is fitted into the case of standard batteries (1.5 V AA, C, D, and 9 V block) together with a Li-ion rechargeable battery, voltage converter, and USB connector.

7. Lightning (connector) - Wikipedia

   en.wikipedia.org/wiki/Lightning_(connector)

   The Lightning to 30-pin adapter supports only a limited subset of the available 30-pin signals: USB data, USB charging, and analog audio output (via the DAC inside of the adapter [27]). Lightning connectors contain an authentication chip that makes it difficult for third-party manufacturers to produce compatible accessories without being ...