Maxim Integrated MAX9938FELT+TG7 Precision Current-Sense Amplifier

The MAX9938FELT+TG7 from Maxim Integrated is a high-precision, low-voltage current-sense amplifier that is ideal for a wide range of applications, including battery management, portable devices, and power management systems. This current-sense amplifier is known for its accuracy and low power consumption, making it an excellent choice for systems where efficient power usage is critical.

This device is specifically designed to accurately measure small differential voltages across a shunt resistor in the presence of high common-mode voltages. The MAX9938FELT+TG7 is capable of sensing differential voltages as low as 250µV, while supporting common-mode voltages from -0.1V to +28V, even though the supply voltage can be as low as +1.6V. This flexibility makes it suitable for both low and high-side current sensing.

The amplifier offers a gain accuracy of ±0.5%, which ensures precise current measurement without the need for calibration in most applications. Additionally, the MAX9938FELT+TG7 features a low input offset voltage of 250µV (max) and low offset drift with temperature, which contribute to its overall precision.

Maxim Integrated has packaged the MAX9938FELT+TG7 in a tiny 6-pin TDFN package, which is optimized for space-constrained applications. The small footprint does not compromise its performance, as it still delivers a wide bandwidth of 500kHz and a quick response time, which is crucial for fast-changing load conditions.

The device also includes a shutdown feature that reduces the supply current to less than 1µA, further enhancing its suitability for battery-powered applications where power conservation is essential. With its wide temperature range of -40°C to +125°C, the MAX9938FELT+TG7 is reliable in various environmental conditions.

In summary, the Maxim Integrated MAX9938FELT+TG7 is a versatile, high-precision current-sense amplifier that offers excellent performance in a compact package. Its accuracy, low power consumption, and wide operating range make it an ideal choice for designers looking to improve their system's power monitoring and management capabilities.