Introduction

Wireless charging is a technology that transfers energy through an electromagnetic field. It enables contactless charging for electronic devices, providing users with great convenience by allowing them to charge their devices wherever they are placed. However, due to reasons such as relatively low charging power and limited applicability, many users with phones featuring this capability don’t often use it. However, with continuous advancements in wireless charging technology and its efficiency, people are becoming more inclined to use more efficient wireless charging devices. Nevertheless, the realization and progress of wireless charging technology heavily rely on the support of the wireless power transmitter controller.

The wireless power transmitter controller is a critical component in wireless charging systems, responsible for controlling the entire charging process, including energy transmission, reception, and conversion. In recent years, with the development and widespread application of wireless charging technology, the demand for it has been continuously increasing. ChargerLAB has learned that NuVolta has introduced a highly integrated wireless power transmitter controller capable of achieving 15W of wireless charging; it incorporates a boost converter, a 32-bit MCU, and supports QC/PD protocols, consolidating functionalities that traditionally required multiple chips, thereby significantly reducing development costs.

NuVolta NU1718

The NU1718, developed by NuVolta, is a highly integrated wireless power transmitter controller. It integrates a boost converter for regulating the input voltage, capable of adjusting the output voltage range from 5V to 45V in 25mV steps. Additionally, it integrates four sets of half-bridge drivers to control dead time and slope, a 91.996MHz clock frequency, a 32-bit architecture, 64K programmable memory, 4K static random-access memory for the microcontroller core, and a fast charging module supporting QC/PD protocols, meeting the specifications for Qi2 MPP effectively.

It incorporates key functions of the power system, including low electromagnetic interference (EMI) field-effect transistor (FET) drivers, startup circuits, 5V/3.3V/1.8V LDO power supplies, and high-precision current measurement. Its unique current measurement circuit provides accurate readings for FOD power measurement, also supporting in-band management, Q-factor detection, and ASK demodulation. Moreover, the NU1718 integrates protection features such as input undervoltage lockout, overvoltage protection, overcurrent protection, an innovative Juggle Protection circuit, and thermal shutdown, further enhancing the reliability of the entire system solution.

It exhibits ultra-low static current in sleep mode, less than 20uA, significantly conserving energy. The device also supports various communication interfaces, including I2C master/slave and UART interfaces, providing more choices and convenience for system integration. Additionally, the NU1718 is equipped with robust data acquisition capabilities, featuring 13 channels and a 14-bit ADC, offering precise and diverse data sampling and monitoring.

The NuVolta NU1718 adopts a 6mm x 6mm QFN48 package. The multitude of advantages described above makes the NU1718 an ideal choice for a wireless charging transmitter module compliant with WPC V1.3 EPP 15W standards. And the NU222 module equipped with this chip has already passed Qi2 certification. Simultaneously, the NU1718 is suitable for wireless power transmitters in various fields, including consumer products, industrial applications, automotive aftermarket, and medical industries.

Summary of ChargerLAB

The NU1718 is a highly integrated wireless power transmitter controller developed by NuVolta. It incorporates a synchronous boost converter capable of adjusting the output voltage range from 5V to 45V in 25mV steps. It integrates four sets of half-bridge drivers, a 32-bit MCU, and supports fast charging with QC/PD protocols. The NU1718 integrates multiple critical power system functions, including low EMI FET drivers, startup circuits, LDO power supplies, high-precision current measurement, while providing multiple protections. In sleep mode, the NU1718 exhibits an ultra-low static current of less than 20μA and features various communication interfaces and a 13-channel, 14-bit ADC, suitable for wireless power transmitters across diverse fields.

Related Articles：
1. Global Debut of NuVolta Qi2 MPP Module
2. For iPhone 15 | ConvenientPower Launches Three Qi2 MPP Wireless Charging Modules
3. Forward Thinking | 9 Qi2 Wireless Charging Chips by 6 Leading Manufacturers