Ultra-Compact and Highly Integrated | Maxic Launches the MT5702 15 W Wireless Charging Receiver for Compact Devices

The widespread adoption of wireless charging in compact devices such as TWS earbuds, styluses, and electric toothbrushes is driving continuous growth in the low-power wireless charging receiver market.

These receivers are increasingly evolving toward smaller footprint, higher efficiency, and superior integration to meet the requirements for safe and efficient charging within highly compact designs.

To address the rigorous requirements of compact devices for wireless charging, Maxic introduces the next-generation solution MT5702.

The receiver is a high-performance inductive wireless charging system-on-chip (SoC) with a package size as small as 1.85 mm × 2.18 mm, specifically designed for ultra-compact products such as TWS earbuds.

The highly integrated wireless charging receiver MT5702 supports the WPC Qi 1.3 standard and integrates an ARM Cortex-M0 processor, synchronous rectifier, LDO, and various protection circuits.

With an ultra-compact package, the receiver delivers up to 15 W output power and 95% conversion efficiency, making it suitable for a wide range of low-power wireless charging applications such as smartphoness, smartwatches, earbuds, styluses, and electric toothbrushes.

• Output Power: 10W(10V/1A), up to 15 W (10 V / 1.5 A) with CSP package

• Output Voltage: Programmable from 3 V to 12 V

•  Integrated ARM Cortex-M0 processor with 6 KB SRAM, 512 B OTP, and 16 KB ROM

•  Full synchronous rectification control with ultra-low Rdson

•  Operating Frequency: 85 kHz – 500 kHz

•  Supports 1.8 V and 1.2 V I/O

•  Dual ultra-compact package options: 1.85 mm × 2.18 mm (WLCSP) and 2.31 mm × 2.39 mm (QFN)

■  High Integration

MT5702 supports two ultra-compact package options. The WLCSP package measures only 1.85 mm × 2.18 mm, while the QFN16 package measures 2.31 mm × 2.39 mm. The receiver integrates an ARM Cortex-M0 processor (6 kB SRAM and 16 kB ROM), synchronous rectifier, LDO, and various protection circuits.

Its peripheral circuitry is highly simplified. A typical application requires only a few passive components, such as the coil, capacitors, and resistors, significantly reducing BOM cost and PCB footprint.

■  Programmable

MT5702 is fully compliant with the WPC Qi 1.3 BPP specification and supports application designs based on the standard BPP protocol. For non-standard protocol applications, the default output voltage can be customized through OTP programming, supporting fine adjustment and current limiting from 3 V to 12 V (25 mV per step) or 3 V to 6 V (12 mV per step).

In addition, parameters such as FOD compensation and the VRECT curve can be configured according to specific customer requirements, enabling deeper design customization.

■  Various Protections

System reliability is the core of the MT5702 design, which integrates multiple safety protections. The receiver supports foreign object Detection (FOD) to monitor the charging area in real time and prevent safety risks caused by metallic foreign objects.

In addition, it incorporates comprehensive hardware protection mechanisms, including overvoltage protection (OVP), overcurrent protection (OCP), short-circuit protection (SCP), and over-temperature protection (OTP).

As the latest addition to Maxic’s wireless power receiver portfolio, MT5702 combines high performance, compact size, and low power consumption, offering engineers a highly competitive design option.