First Qualcomm Quick Charge 4 27W reference design

November 01, 2017 // By Nick Flaherty
Diodes and Weltrend Semiconductor have a joint reference design for a 27W Class A charger that is one of the industry’s first to support Qualcomm's Quick Charge 4 specification for the fast charging of mobile devices.

Quick Charge 4 is the latest fast-charging specification from Qualcomm Technologies awith up to 20% faster charging, up to 30% greater efficiency, and running 5% cooler when compared to Quick Charge 3.0. Quick Charge 4 also supports USB PD and PPS (programmable power supply), helping to provide five hours of talk time from just five minutes of charging.

“Diodes’ key corporate strength is rooted in its integrated device manufacturing (IDM) operations model. Our vertical integration manufacturing strength with a platform solution approach provides the relevant active components required for target systems, especially as Diodes has a well-established business in providing primary- and secondary-side power regulation products for chargers and power adapter applications,” said Ernest Lin, Division Manager, AC-DC Power and Lighting Division of Diodes. “Diodes recognised Weltrend’s core competency in MCU-based power management applications and its established market position in protocol decoding products for quick charging, which made for a logical partnership for developing a reference design to meet the demanding requirements of the Qualcomm Quick Charge 4 specification.”

The reference design uses Diodes’ AP3302 peak-current control, quasi-resonant (QR) PWM controller, which is optimized for high performance, low standby power and cost-effective offline flyback conversion, and its APR345 secondary-side MOSFET synchronous rectification driver that directly supports CCM, DCM and QR flyback topologies. Weltrend provides the WT6615F programmable protocol decoder that supports the latest programmable power supply specification for Quick Charge protocols and USB PD and so fully implements all the requirements of the Quick Charge 4 specification.

“Working closely with Qualcomm Technologies, our expertise lies in understanding fast charge protocols and we are excited to be one of the first in our industry to provide a Quick Charge 4 compatible chipset," said Tony Lin, Acting VP of Marketing at Weltrend. "The joint development of this 27W Quick Charge 4 Class A reference design with Diodes provides a cost-effective, ready-to-go charger design that enables a rapid time-to-market solution for our mutual customer bases”.

The reference


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