MAX4173FESA-T

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The MAX4173FESA-T is a ±4milliampere current sense amplifier. It is designed for precision sensing of low level currents in industrial, instrumentation, process control and medical applications. The amplifier operates on a single supply voltage, or ± dual supplies, with a supply current of only 3mA and with input and output voltages down to ground. The amplifier is useful for current sensing applications including current shunt measurement, current transformer measurement, current transfer function control and control loops.

The MAX4173FESA-T is an instrumentation amplifier comprised of a fully differential input stage and output stage. The differential input stage features high common-mode rejection and allows the input voltage to vary over a large voltage range without significant errors. The amplifier is also equipped with a low offset voltage to minimize shift in the output that can be caused by temperature variations. The gain of the amplifier can be controlled with the use of input resistance and capacitance.

The amplifier’s output stage is capable of driving low impedance loads. It has a wide dynamic range and a high slew rate making it suitable for high frequency operation. The output stage has a maximum output voltage of ±4.5V. It can be configured as a unity gain or configure with a greater gain.

The amplifier has several features that enhance its performance. It has a low offset voltage of ±25µV typical, provides high common-mode rejection, enabling it to accurately sense current signals over a wide voltage range. The supply current consumption is very low, only 3mA, making it ideal for battery powered applications. The slew rate is exceptionally high, 11V/μs, making it suitable for fast settling times. The temperature stability is also very good and it is much less affected by external temperature drifts.

MAX4173FESA-T is commonly used in applications such as medical instrumentation, automotive and industrial control, switching power supplies, precision current limiting, and power converters. It can be used to accurately measure currents from a few milliamps up to ±4A typically. The amplifier is also suitable for data conversion, from analog to digital, and for current sensing applications. The MAX4173FESA-T can be used for accurately measuring and controlling a variety of input signals, such as temperature and pressure, in a wide range of industrial, medical, instrumentation and process control applications.

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