24V MOSFET protects battery circuits in wireless earphones

A 24V MOSFET developed by Magnachip Semiconductor addresses the goal of battery designers for long battery life after a quick charge by reducing conduction loss. 

The core cell density of this MOSFET has been increased by 30 per cent compared to the company’s previous version. In addition, the design of the core cell, termination and source pads has been enhanced to reduce the RDS(on) by 24 per cent.

As a result, the conduction loss is significantly reduced while charging and discharging, said Magnachip, and the overall efficiency for protecting battery circuits is improved. In addition, this 24V MOSFET features electrostatic discharge (ESD) protection to suppress abnormal voltages of more than 5.0V and can withstand a maximum of 2kV of ESD for strong circuit protection. According to Magnachip, these features contribute to extending the service life of earphone batteries.

The 24V MOSFET joins three types of low voltage MOSFETs designed to meet the rigorous demands of smartphone batteries and the company is anticipating further application areas. YJ Kim, CEO of Magnachip, said: “We look forward to expanding our family of products for battery-powered devices in the near future by introducing 24V MOSFETs for [virtual reality] VR glasses and wearable devices”.

Market research company, Omdia, estimates that the wireless earphone market will grow 15.1 per cent annually from 2020 to 2026. This 24V MOSFET is now in mass production and is being supplied for premium earphone batteries used by global earphone manufacturers. 

Magnachip Semiconductor is a designer and manufacturer of analogue and mixed-signal semiconductors for communications, IoT, consumer, computing, industrial and automotive applications. The company has more than 40 years of operating history, owns a portfolio of approximately 1,100 registered patents and pending applications, and has expertise in engineering, design and manufacturing process,


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