Audio Switch & Current Sense Amps Eye Mobile Markets

ON Semiconductor latest products can be used together in USB-C (Type-C) applications as well as other power-oriented applications. The devices include the FSA4480, a USB Type-C analog audio switch with integrated protection, and the NCS21x series current-sense amplifiers.


The FSA4480 is a USB Type-C port multimedia switch that supports analog audio headsets allowing a common USB Type-C port to pass USB2.0 signals, analog audio and analog microphone signals. The device supports an audio sense path and includes voltage protection up to 20 Vdc and offers pinout support for both OMTP and CTIA smartphone headset standards. There is overvoltage protection (OVP) on the common node pins and the unplugging of any audio device is automatically detected. With its integrated I2C interface, the FSA4480 is controlled by a host processor and audio ‘pop and click’ is highly reduced as the change is made. The device is housed in a small WLCSP chipscale package measuring 2.24 mm x 2.28 mm x 0.5 mm.

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The NCS21x family of bi-directional current sense amplifiers integrate matched precision resistors that offer a compact system design for measuring small differential voltages. The devices can detect common mode voltages in the range -0.3 to 26 V, making them ideal for both high-side and low-side current sensing. The zero-drift architecture of the NCS21xR provides a low input offset voltage (as low as 35 µV) and low offset drift (as low as 0.5 µV/°C). Together with integrated gain setting components, these devices are capable of sensing smaller voltage drops across the shunt, providing a higher gain accuracy and superior temperature performance.


Offered in 50/ 100/ 200, and 500/ gain options with a maximum gain error of ±1%, these devices consume a low quiescent current of 40 μA, which significantly improves efficiency and makes them ideal for power conscious, battery-powered applications. The small SC-70 and UQFN packages make them ideal for monitoring charging and discharging current for battery management in handheld applications such as smartphones, tablets and laptops.


For more information, checkout an FSA4480 datasheet and a product overview, plus take a gander at some bi-directional current sense amplifiers. Also, visit ON Semiconductor.

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