ON Semiconductor addresses USB Type-C with audio switch and amplifiers

Designed for tablets, smartphones, laptops and other USB-C and power-oriented applications, the FSA4480 USB Type-C analogue audio switch and the NCS21x current sense amplifiers have been announced by ON Semiconductor.

The FSA4480 is a high-performance USB Type-C port multimedia switch that supports analogue audio headsets allowing a common USB Type-C port to pass USB2.0 signals, analogue audio and analogue microphone signals. The device supports an audio sense path and is fully integrated and developed to ease design-in and minimise overall footprint. The FSA4480 includes integrated high voltage protection up to 20V DC, and offers pinout support for both OMTP and CTIA – smartphone headset standards. There is over-voltage protection on the common node pins and the unplugging of any audio device is automatically detected.

The integrated I2C interface is controlled by a host processor and audio ‘pop and click’ is reduced as the change is made. It is housed in a small WLCSP chipscale package measuring 2.24 x 2.28 x 0.5mm, for space-constrained mobile applications.

The NCS21x family of bi-directional current sense amplifiers include integrated, matched precision resistors, that offer an accurate, compact system design for measuring small differential voltages. The devices are able to detect common mode voltages in the range -0.3 to 26V, making them suitable 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 microV) and low offset drift (as low as 0.5 microV/ degree 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 ± one per cent, the devices consume a low quiescent current of 40 microA, for energy efficiency for power conscious, battery-powered applications. The small SC-70 and UQFN packages make them suitable for monitoring charging and discharging current for battery management in handheld applications such as smartphones, tablets and laptops.

Current sense amplifiers are used in USB Type-C interfaces in markets such as hybrid and electric vehicles and consumer products for power management, motor control and signal conditioning blocks.


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