Maxim Integrated's MAX9611AUB: High-Side Current-Sense Amplifier with Analog Output

The MAX9611AUB from Maxim Integrated is a sophisticated, high-side current-sense amplifier with an integrated 12-bit analog-to-digital converter (ADC) and an external p-channel MOSFET. This compact device is housed in a small, 10-pin µMAX package, making it ideal for space-constrained applications where precise current monitoring is essential.

Designed to operate over a wide supply voltage range of 3V to 5.5V, the MAX9611AUB is suitable for a variety of systems, including those requiring low-voltage operation. Its high-side current-sensing capability allows for the detection of current through a high-side sense resistor, which enables the monitoring of battery or power-supply currents without interfering with the ground path of the load.

The integrated ADC provides a digital representation of the sensed voltage, which can be read via an I2C-compatible 2-wire serial interface. This feature allows for easy integration with microcontrollers and other digital systems. The device also includes a precision, low-drift (25ppm/°C max) reference, which ensures accurate current measurements over a wide temperature range.

One of the key features of the MAX9611AUB is its ability to sense both high-side current and the voltage across the sense resistor. This dual capability enables the device to provide valuable diagnostic information, such as the detection of open-circuit or short-circuit conditions. Additionally, the MAX9611AUB offers an internal 1% accurate 3V or 5V voltage reference, which can be used for other system-level reference needs.

The device also includes built-in protection features such as overvoltage protection, which safeguards the input of the device against transient conditions that may occur in automotive or industrial environments. The MAX9611AUB operates over the extended -40°C to +125°C temperature range, making it suitable for demanding applications in harsh environments.

Overall, the MAX9611AUB from Maxim Integrated is a versatile and reliable choice for high-side current sensing in a wide array of applications, including power management, battery chargers, and automotive systems, where precise current monitoring and diagnostics are critical.