The P9261 from Renesas is a Magnetic Induction Wireless Power Transmitter Controller which supports the WPC Qi specification or proprietary applications. The device functions with multiple coils in a full-bridge or half-bridge inverter configuration.
The transmitter generates power through the power coil, detects the presence of a wireless power receiver, decodes the communication packets from the receiver, and adjusts the transmitted power by controlling the voltage based on feedback from the receiver. The transmitter will enable the power receiver to output 15W if the bidirectional communication protocol can be established, or the power receiver will output only 5W for a standard 5W power receiver.
To safeguard the device and the system under fault conditions, the P9261 includes input under-voltage, input overvoltage, output short-circuit, and over-temperature protection. The microcontroller allows users to customize features such as LED patterns, foreign object detection (FOD) threshold settings, or the over-temperature threshold. The device supports the I2C serial interface protocol, which enables the user to control the basic parameters, such as operating mode, switching frequency, input current, and input voltage.
The P9261 is available in a 48-QFN wettable flank RoHS-compliant package that measures 7 x 7 mm and is ideal for use in automotive in-cabin WPC Qi 1.2.4 wireless charger. This device is rated over the operating temperature range of -40ºC to +105ºC.