Reference design supports Qualcomm Quick Charge 4 Class A
Diodes has teamed up with Weltrend Semiconductor to produce a joint reference design for a 27W, Class A charger that is one of the first in the industry to support the Qualcomm Quick Charge 4 specification.
Created by the semiconductor manufacturer and USB Type-C Power Delivery (PD) controller companies, the reference design meets the needs of developers designing for the specification for the fast charging of mobile devices.
Quick Charge 4 is the latest fast-charging specification from Qualcomm Technologies. It offers up to 20 per cent faster charging, up to 30 per cent greater efficiency, and runs five per cent cooler when compared to Quick Charge 3.0.
Quick Charge 4 also supports USB PD and programmable power supply (PPS), helping to standardise the capabilities of adapters using these technologies. It is designed, says Diodes to deliver headline-making charging performance that provides five hours of talk time from just five minutes of charging, along with comprehensive safety features.
“Diodes’ key corporate strength is rooted in its integrated device manufacturing (IDM) operations model. Leveraging our vertical integration manufacturing strength in conjunction 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. “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 optimised 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 integrated WT6615F programmable protocol decoder that supports the latest programmable power supply specification for Quick Charge protocols and USB PD.
Tony Lin, executive assistant to the CEO at Weltrend, said: “. . . 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. 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”.
Weltrend’s WT6615F Qualcomm Quick Charge 4 Controller is certified by GRL. The reference design supports Quick Charge 4 Class A (18-27W) and also provides optional Quick Charge 2.0 and Quick Charge 3.0 compliance to support the Quick Charge 4+ program. It provides support for USB PD 3.0 and PPS, including PDO at 5.0 and 9.0V, ADPO from 3.0 to 11V in 20mV steps, and current from 0 to 3.0A in 50mA steps.
Safety management capability provides monitoring of voltage, current, and temperature, with reporting and protection features. The charger design supports low standby current consumption and meets Energy Star DOE VI and CoC Tier II efficiency requirements.