Introduction

In recent years, with the continuous advancement of new energy vehicle (NEV) technology and the growing demand for intelligent in-car experiences, automotive manufacturers have been exploring new features to enhance user convenience. Wireless charging, as a convenient and efficient charging solution, has gained widespread popularity among consumers. Many car buyers now consider wireless charging capability an important factor when selecting an NEV.

Currently, many high-end versions of NEVs are equipped with 50W wireless charging systems, making this feature a key selling point for automakers. Achieving such high-efficiency charging requires advanced wireless power transmitter chips. To meet this demand, NuVolta Semiconductor has recently launched the SN90050Q, an automotive-grade wireless power transmitter chip that not only supports 50W wireless power output but also complies fully with the AEC-Q100 Grade 1 standard.

NuVolta SN90050Q

The SN90050Q is an advanced automotive-grade wireless power transmitter chip designed by NuVolta Semiconductor. It features a wide input voltage range of 3V to 27V and can withstand transient voltages up to 35V, delivering a maximum output power of 50W. This chip adopts a full-bridge architecture, integrating four 12mΩ low-Rdson power MOSFETs and an optimized low-EMI gate driver circuit to enhance system efficiency.

The SN90050Q also incorporates a high-precision input current sensing circuit with ±1% accuracy, supporting Foreign Object Detection (FOD). It features adaptive dead-time control, a 5V LDO voltage regulator, and an I2C interface, allowing for multi-channel charging address configuration. Moreover, it integrates multiple protection mechanisms, including input undervoltage/overvoltage protection, overcurrent protection, short-circuit protection, and over-temperature protection. The chip also provides real-time fault indication via an open-drain INT pin.

To meet the stringent FOD requirements of the Qi Extended Power Profile (EPP) standard, the SN90050Q includes a current-sensing amplifier with adjustable gain. By working with an external current-sensing resistor, it enables precise monitoring of input power loss.

Having successfully passed ESD tests, the SN90050Q also supports external VCC operation mode, reducing internal LDO power consumption. The chip achieves an efficiency of 90% at 15W output and maintains above 85% efficiency even at full 50W load. It is available in a compact QFN21 package and is suitable for WPC Qi EPP-compliant wireless charging transmitters, automotive 15-50W wireless charging systems, high-end industrial applications, and motor drivers.

Summary of ChargerLAB

NuVolta Semiconductor's SN90050Q chip provides a solid hardware foundation for wireless charging systems, thanks to its wide input voltage range, high 50W power output capability, and exceptional power conversion efficiency. Featuring an integrated full-bridge architecture, low-Rdson MOSFETs, low-EMI drivers, and high-precision current sensing, this chip ensures stable operation even under high loads. Additionally, its compliance with stringent automotive-grade standards and safety protection features highlights its advanced design and reliability.

From a professional perspective, the SN90050Q is a comprehensive solution tailored for high-end NEVs and industrial applications. With its multiple built-in protection mechanisms and flexible system configuration, it significantly reduces external design complexity and system costs. By offering high efficiency and intelligent monitoring capabilities, this chip is set to drive the adoption and advancement of wireless charging technology in automotive, industrial, and motor drive applications.