Quick Charge 4 is the latest fast-charging specification for mobile devices from Qualcomm Technologies. It offers up to 20% faster charging, up to 30% greater efficiency, and runs 5% cooler when compared to Quick Charge 3.0. Quick Charge 4 also supports USB power delivery (PD) and programmable power supply (PPS), helping to standardise adapter capabilities. It is designed to deliver charging performance that provides five hours of talk time from just five minutes of charging.

The joint reference design for a 27W, Class A charger uses Diodes’ AP3302 peak-current control, quasi-resonant (QR) PWM controller 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 programmable power supply specification for Quick Charge protocols and USB PD, to implement all the requirements of the Quick Charge 4 specification.

Weltrend’s WT6615F Qualcomm Quick Charge 4 controller is certified by GRL. The reference design supports Quick Charge 4 Class A (18 to 27W) and also provides optional Quick Charge 2.0 and Quick Charge 3.0 compliance to support the Quick Charge 4 program. It supports 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 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.