Maxim Integrated MAX4372HESA+ High-Side Current-Sense Amplifier

The MAX4372HESA+ from Maxim Integrated is a high-accuracy, low-cost, high-side current-sense amplifier that is designed to simplify the task of power management in a wide array of applications. This compact, integrated circuit (IC) offers a simple solution for detecting and converting current to a measurable voltage, which is proportional to the current through the sense resistor.

Encased in a small 8-pin HESA+ surface-mount package, the MAX4372HESA+ is capable of measuring the voltage across shunt resistors over a wide range of common-mode voltages, from 0V up to +28V, despite operating from a single +2.7V to +5.5V supply. This makes it particularly suitable for portable devices, where power efficiency and battery life are critical considerations.

With its precision integrated gain-setting resistors, the device provides a fixed gain of 20V/V, 50V/V, or 100V/V, depending on the variant, which eliminates the need for external gain-setting components and simplifies the design process. The MAX4372HESA+ also features a low input offset voltage, which minimizes error and enhances the accuracy of current measurement.

The high-side measurement configuration allows the detection of current in systems where the ground is not accessible or where it is important to avoid disturbing the ground plane. This is particularly useful in battery management systems, power management for computers and servers, and in automotive and telecommunications equipment, where high-side current monitoring is often required.

Additional features of the MAX4372HESA+ include a fast response time, which is essential for overcurrent protection applications, and a quiescent current of just 50µA, which contributes to the overall energy efficiency of the end product. The device also includes a filter pin for added noise reduction, which allows for flexible bandwidth tuning to suit specific application needs.

In conclusion, the Maxim Integrated MAX4372HESA+ is a versatile, high-performance current-sense amplifier that offers a compact, cost-effective solution for a variety of high-side current monitoring applications, providing designers with accuracy, simplicity, and efficiency.