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Bluetooth headset
Wireless Bluetooth headsets are one of the smallest applications in mobile devices. It is designed to incorporate as many devices as possible in a super-small profile, which requires them to consume less power, provide better audio, and even include noise cancellation and bio-monitoring functions. In addition to these features, it is also required to ensure a long battery life. “Our ultra-small wafer-level packages can help you provide the functionality you need for consumer electronics.”
Functional block diagram

 Load switch MOSFET: VDSS 12-20v
Battery MOSFET: VDSS 12-20v, p-channel
TVS (ESD) : antenna protection/mobile applications
Diode (Schottky rectifier) : VR: 20-40V IF >200ma

Design Considerations

There is a balance to be struck between ultra-long battery life and always-on functionality-energy efficiency is very important
Low power consumption is essential for these small wearable devices
Requires very small package or wafer-level chip occupation area
“For more energy-efficient wired charging, you can use two back-to-back mosfets instead of built-in Schottky diode.”