The most common method of wireless electrical energy transfer is magnetic induction, which is the basic principle used by the Wireless Power Consortium (WPC) standard. The receiver inductor coil shares the transmitter inductor’s changing magnetic field and a voltage is induced in the receiver coil, which is then rectified and regulated.

WPC Qi systems allow efficient power transfer over distances up to around 5mm between the two coils. A smart backscatter communication from receiver to transmitter keeps the system regulated and safe. Qi certified receivers are tested to work with Qi certified transmitters, providing good compatibility between many devices.

Features:

－ Highly integrated solution with on-board 32-bit ARM-Cortex-M0 MCU for all WPC communication, system monitoring and fault detections.

－ Very flexible with a user configurable MTP memory. With default firmware, it is compliant with the WPC1.1 low power standard, providing output power up to 5W. With some firmware change it can meet WPC1.2.0 medium power standard for power up to 7.5W. RT1650 can also be configured to support the PMA standard.

－ RT1650 includes a high efficiency fully synchronous rectifier stage, and a low drop 1.5A linear post regulator stage. A special headroom control system regulates the LDO headroom for optimal balance between transient response and system efficiency.

－ Supports both adapter input and wireless power transfer input. Two MODE pins can be used to disable or enable specific inputs. Other features include NTC temperature sensing, programmable IC temperature control and operation mode signaling.