Overview of TWS Earphones

TWS stands for True Wireless Stereo, meaning truly wireless stereo. TWS technology is based on Bluetooth chip technology. Tracing its development, it all started with Apple. In 2017, when the iPhone 7 removed the 3.5mm headphone jack, the Bluetooth earphone market experienced rapid growth. Apple then led the way by launching the world’s first TWS Bluetooth earphones, AirPods, bringing new vitality to the Bluetooth earphone industry.

Composition of TWS Earphones

TWS Bluetooth earphones consist of two main components: the charging case and the earbuds.

• Charging Case

• Battery capacity: 450-750mAh

• Composed of a charging management IC, MCU, and battery

• The charging port typically includes TVS and OVP protection

• Earbuds

• Battery capacity: 50-55mAh

• Consist of a Bluetooth chip, G-sensor, in-ear detection module, lithium battery management chip, and battery

TWS Earphone Overcurrent Protection – Recommended Jeff Micro Components

Jeff Micro (GLF) provides load switches designed for TWS products:

• GLF73910 – Lithium battery protection (WLCSP-4L, 0.8uA), smaller than a 0603 resistor

• GLF76321 – Deep Sleep mode (0.97mm × 1.47mm, WLCSP-6L), ultra-compact, ultra-low R(dson) of 31mΩ

TWS Earphone – Recommended Canrui Components

As the TWS earphone market adopts screen display functionality in charging cases, our company recommends OCS (Canrui) brand Hall sensors for lid detection:

• OCH4002 – Unipolar Hall sensor, cost-effective (recommended product)

• OCH1608 – Omnipolar Hall sensor, industry-leading ultra-low power consumption (0.8uA)

• OCH166A – Omnipolar Hall sensor, compact packaging (DFN1216, etc.)

• OCH1661 – Omnipolar Hall sensor, available in plug-in packaging

Example Application

The Motorola Verve Buds 200 TWS Bluetooth earphones use 1608 80AG Hall sensor to detect lid opening and closing.

TWS Earphone Application Solution – Prisemi Component Recommendation

Prisemi primarily promotes the PB15305 charging chip for TWS earphone charging cases.

Advantages: 2A charging, three independent outputs, and independent detection.

In TWS earphone applications for electrostatic protection, surge protection, and OVP overvoltage protection, Prisemi has developed corresponding targeted products for effective protection, as detailed in the table below:

TWS Earphone – Harvatek Component Recommendation

TWS Earphone – PIONEER Agency Component Recommendation

Our agency also provides other products suitable for TWS earphone applications, such as boost chips, crystals, and sensors. The recommended components are listed in the table below.

A key recommendation is ROHM's miniature proximity sensor, which is currently used in Huawei smartphones.

Advantages:

• Compact size

• Simple design

• Cost-effective

Sensor Model: RPR-0521RS