Introduction

As the 2023 WPC charging standards receive updates, the Qi wireless charging standard has progressed into the Qi 2.0 era. This advancement introduces the MPP (Magnetic Power Profile) technology, drawing its foundations from Apple's MagSafe magnetic charging innovation. In contrast to BPP and EPP, MPP distinguishes itself by integrating magnetic rings for precise alignment, resulting in swifter charging, heightened efficiency, and amplified user convenience. The primary objective of this standard is to elevate the user experience of wireless charging, fortifying safety and compatibility standards, thereby paving the way for future enhancements.

We previously reported the forthcoming support for Qi2 wireless charging technology across the entire iPhone 15 series. Unexpectedly, December's release of Apple's iOS 17.2 RC version brought about surprising support for Qi2 wireless charging technology across models like the iPhone 13 and iPhone 14. This signifies that a total of 12 models, encompassing the iPhone 13, 14, and 15 series, now embrace the latest Qi2 standard. The MPP module not only replaces traditional MagSafe modules but also reduces wireless charging costs while enhancing user experiences. Its widespread application extends to wireless charging docks, magnetic power banks, car mounts, and others.

What is the Qi2 Wireless Charging Standard?

The latest Qi2 wireless charging standard from the WPC, optimized based on Apple's MagSafe, known as the Magnetic Power Profile (MPP) protocol, makes wireless charging more convenient and efficient for users, offering improved compatibility. WPC has standardized and integrated authentication verification, enhancing practicality and convenience while promoting the widespread adoption of wireless charging.

Qi2 certification requires products to include EPP and MPP transmitting areas and must incorporate authentication. Single BPP wireless chargers cannot receive Qi2 certification. In multi-in-one wireless chargers, they can include BPP, but they must include at least one EPP or MPP.

Infineon Unveils Next-Gen Qi2 MPP Module REF_WLC_TX15W_M1-Chargerlab

Qi2 certification must pass ATL verification, and there are currently 11 authorized labs in the WPC network.

Qi2 MPP Wireless Charging Module

MagSafe is Apple's proprietary protocol, requiring Apple's authorized MFi certification to achieve 15W fast charging for iPhones. Without certification, even though it can magnetically attach for charging, it remains at 7.5W. This limitation restricts the expansion of the ecosystem. Qi2 MPP upgrades the proprietary protocol to the WPC standard. Through Qi2 certification, it can adapt to Apple's 15W fast charging, significantly reducing end-user costs and allowing more chip manufacturers to foster the ecosystem together.

The MPP module not only replaces traditional MagSafe modules but also reduces wireless charging costs and enhances user experience. Recently, ChargerLAB discovered that Infineon has launched its first Qi2 MPP (Magnetic Power Profile) charging transmitter solution – the REF_WLC_TX15W_M1 reference design kit. This development aims to assist in achieving a more comprehensive wireless charging user experience.

Infineon Qi2 MPP Wireless Charging Module

The Infineon REF_WLC_TX15W_M1 is a wireless charging transmitter solution employing the Infineon WLC1 wireless controller. This module supports the Qi2 protocol, offering MPP 15W, BPP, and 5W wireless charging. It can power USB PD 2.0 and higher-spec USB-C power adapters, providing a highly integrated and scalable platform by Infineon, facilitating compliance and proprietary charging needs, and featuring configurable software.

This module has an input voltage range of 4.5V to 24V, enabling a maximum 15W fast charging output with a peak efficiency of 82%. It includes CC or I²C interfaces, integrates internal buck-boost converters, multi-path ASK demodulators, various protections like OVP/UVLO/OCP/OTP, and multiple foreign object detection technologies for a safe, efficient, and reliable charging process.

When using this module for wireless charging at room temperature (25°C), the PCB temperature reaches around 53°C, with an active charging area of approximately 196 square millimeters.

The internal structure diagram of the Infineon Qi2 MPP wireless charging module includes the wireless charging master control chip WLC1115 and authentication chip OPTIGA™ Trust X, which we'll discuss in detail next.

Wireless Charging Master Control Chip WLC1115

Infineon WLC1115 is a highly integrated wireless power transmitter that complies with the Qi2 standard. It integrates a 4.5V to 24V DC input buck-boost converter, an inverter gate driver, factory-calibrated current sensing, supporting MPP, EPP, and BPP protocols, analog protection peripherals, USB PD, LIN, and serial interfaces, enabling efficient and intelligent wireless power transmission.

The WLC1115 complies with USB Type-C and PD 3.1 specifications, meeting the latest Qi specifications for 15W applications and serving as an ideal choice for 15W wireless charging applications. It integrates gate drivers for buck and boost power supplies, supporting an input voltage range of 4.5V to 24V, and provides various programmable features for unique wireless transmitter solutions.

It also features multi-path ASK demodulation, effectively resisting signal distortion caused by multipath propagation, thus improving signal reception sensitivity and performance. Additionally, it includes adaptive foreign object detection to identify and handle potential foreign object interference, ensuring efficient energy transfer to receiving devices, reducing energy loss.

WLC1115 is a highly programmable wireless power transmitter integrated with a USB-PD receiver, featuring an on-chip 32-bit Arm® Cortex®-M0 processor, 128 KB flash, 16 KB RAM, and 32 KB ROM, maximizing available flash space for user applications. Moreover, it incorporates various analog and digital peripherals, such as ADC, PWM, and timers. The WLC1115 also integrates a fully programmable flash microcontroller (MCU) with analog and digital peripherals, offering an expandable multi-coil wireless charging solution for free-positioning transmitters.

Infineon's wireless charging controller (WLC) provides a highly integrated and scalable platform, aiding compliance and proprietary charging requirements. The controller is equipped with I2C and UART communication ports, facilitating connections with other devices. Additionally, it features configurable software functions for personalized settings according to specific application needs.

The WLC1115 operates stably in environments ranging from -40°C to 105°C, employing a QFN68 8 x 8 x 0.65mm package, offering flexible tray or tape and reel options, applicable in wireless charging boards, smart speakers, portable accessories, furniture and home goods, docking stations, high-speed charging support, and other fields for extended power configuration profiles and basic power configurations.

Authentication Chip OPTIGA™ Trust X

OPTIGA™ Trust X is based on an advanced security controller, employing ECDSA for mutual authentication and utilizing DTLS for secure communication. It incorporates tamper-resistant non-volatile memory for secure storage. Furthermore, it includes symmetric/asymmetric cipher engines supporting ECC 256, AES-128, and SHA-256, significantly enhancing system security.

OPTIGA™ Trust X comes with pre-programmed OS/application code locks and includes a host-side module for easy integration with host microcontroller software. It operates within a temperature range of -40°C to +105°C, featuring standardized I²C interfaces and compact PG-USON-10-2 packaging, facilitating convenient integration into existing ecosystems.

Summary of ChargerLAB

The Infineon Qi2 MPP wireless charging module (REF_WLC_TX15W_M1) utilizes the wireless charging master control chip WLC1115, supporting the Qi2 protocol and enabling MPP 15W wireless charging. It boasts high integration, an expandable platform, is compatible with USB PD 2.0 and higher-spec USB-C power adapters, achieving an efficiency of up to 82%. The module offers a maximum 15W fast charging output, CC/I²C interfaces, and integrates multiple protective measures.

The WLC1115 is a highly integrated wireless power transmitter, compliant with both Qi v1.3x standards and expandable to support Qi2.0 MPP protocols, aligning with the latest Qi standards. It also conforms to USB Type-C and PD 3.1 specifications, embedding multi-path ASK demodulation and adaptive foreign object detection capabilities. Additionally, it features a 32-bit Arm Cortex-M0 processor and abundant peripherals, operating reliably within environments ranging from -40°C to 105°C, applicable across multiple domains.

The authentication chip OPTIGA™ Trust X is based on an advanced security controller, facilitating mutual authentication via ECDSA and secure communication through DTLS. It houses tamper-resistant non-volatile memory, supporting ECC 256, AES-128, and SHA-256 cipher engines, significantly enhancing system security. Equipped with pre-programmed OS/application code locks and a host-side module, it integrates easily with host microcontroller software. Operating between -40°C to +105°C, featuring standardized I²C interfaces and PG-USON-10-2 packaging, it aids convenient integration into existing ecosystems.

With the recent formal initiation of Qi2 certification by the WPC, the demand for Qi2 wireless charging innovations is expected to grow significantly. By employing the Infineon MPP 15W wireless charging module, the design of wireless charging products can be notably simplified, leading to cost savings. This can offer the market an entirely new and efficient wireless charging solution.

Infineon Unveils Next-Gen Qi2 MPP Module REF_WLC_TX15W_M1