Quick Charge 3.0 reference design

25 November 2015 Power Electronics / Power Management

ON Semiconductor has introduced a reference design implementing the new Qualcomm Quick Charge 3.0 protocol, which provides significant efficiency improvements over the existing Quick Charge 2.0 solution. The high efficiency, small form factor reference design, with certified conformance from UL, supports the Quick Charge 3.0 High Voltage Dedicated Charging Port (HVDCP) Class A and Class B specifications, Qualcomm’s next generation of fast charging technology for smartphones and tablets, as well as offering backward compatibility to Quick Charge 2.0.

The reference design highlights the new NCP4371 secondary-side charge controller which allows the charger USB-bus voltage to be changed based on requests from the phone or portable device. To optimise the battery charging time, the USB-bus voltage can be controlled in discrete steps from 3,6 V up to 20 V. The new charge controller is also suited for use in A4WP wireless charging applications where the voltage can be optimised based on the transmit (TX) portion of the reference design.

The NCP4371 also removes the need for a secondary shunt regulator, saving cost and the space required to implement a charger design. The primary side controller is the NCP1361 PSR quasi-resonant PWM controller and the synchronous rectification controller is the NCP4305. The combination of these two controllers enables a high efficiency design meeting CoC Tier-2 requirements for chargers.

For more information contact Erich Nast, Avnet South Africa, +27 (0)11 319 8600, [email protected], www.avnet.co.za

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