Application Case | Tesla 5000mAh Magnetic Power Bank Incorporates Maxic Wireless Charging Chips

Tesla is an American electric vehicle and clean energy company whose electric vehicles are global famous and owns certain user base. However, Tesla's ventures extend beyond automobiles. In early 2021, the company introduced a wireless power bank. Recently, the dissembled report by Chongdiantou revealed details about a Tesla magnetic wireless charger.

The magnetic power bank features a minimalist design with a flip-cover, thin block-style form. It comes equipped with a built-in USB-C charging cable and a USB-C port, both supporting 20W PD input and output. The flip-cover design enables magnetic wireless charging for two devices simultaneously, offering output power of 15W and 5W, respectively. Additionally, the back of the device supports 10W reverse magnetic charging for other devices. The product is full of aesthetic and supports multiple functionality.

The disassembled Tesla's 5000mAh magnetic power bank (click to view the full report) consists of built-in two wireless charging output coils and one wireless charging input coil. Its wireless charging function is realized through Maxic's wireless charging transmitter and receiver, as described hereafter.

Product Introduction

Maxic’s MT5806 is used as wireless charging transmitter chip, which is fully compliant with the latest WPC Qi (V2.0) standard. It supports multiple wired fast charging protocols, such as PD, UFCS, FCP, SCP, and QC, and is certified for PD and UFCS wired fast charging protocols. The chip supports a wide input voltage range of 4V-20V and delivers up to 15W output power.

MT5806 integrates an ARM Cortex M0 processor with 4KB SRAM and 32KB MTP memory and various serial interfaces (e.g., I2C, UART), offering robust processing capability and ample programming space. Standard firmware with reference applications is provided, allowing customers to easily develop customized features.

MT5806 integrates independent high frequency and low frequency oscillators for low power and low cost applications. The internal high-frequency PLL, combined with an external crystal, is used to generate precise clock and PWM signals. Additionally, the chip provides flexible dead-time control and phase shift generation to enhance EMI performance.

MT5806 is embedded with overvoltage protection (OVP), overcurrent protection (OCP), undervoltage protection (UVP), and over-temperature protection (OTP). It also features a Dynamic Power Limiting (DPL) comparator to prevent the IC from entering an undervoltage lockout (UVLO) state when the input power is insufficient to meet the output power demands. If the VDD voltage drops below the DPL threshold, the chip automatically reduces the output power to protect the system from entering UVLO. MT5806 is available in FCQFN24L package.

Maxic’s MT5727H, a wireless charging receiver, supports up to 20W single-chip solution. The chip can also be configured as a wireless transmitter to power other receivers, and is fully compliant with the WPC Qi 1.2.4 standard.

MT5727H integrates an ARM Cortex M0 processor with 8KB SRAM and 16KB MTP memory. It supports proprietary wireless charging protocols and includes an integrated synchronous rectifier and LDO. The chip is embedded with overvoltage and overcurrent protection, supports I2C interface, and offers configurable GPIO interfaces. It is available in WLCSP52 package.

Maxic will continue to strive for continuous optimization and development of products, providing customers with more effective solutions.

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