Maxim Integrated MAX4080SAUA High-Side Current-Sense Amplifier

The MAX4080SAUA from Maxim Integrated is a precision, high-side current-sense amplifier designed to monitor power supply currents in a compact, surface-mount 8-pin µMAX package. This device is an ideal choice for a wide range of applications, including automotive, industrial, and communication systems where accurate current measurement is crucial for performance and reliability.

The MAX4080SAUA operates over a wide supply voltage range from 4.5V to 76V, which makes it suitable for high-voltage applications without the need for external components to scale down the voltage. Its high-side measurement capability allows for the detection of current flowing through a shunt resistor placed in the supply line, ensuring minimal disruption to the system ground and reducing noise susceptibility.

With a fixed gain of 20V/V, the MAX4080SAUA provides a precise output voltage proportional to the current passing through the sense resistor. This allows for easy interfacing with analog-to-digital converters (ADCs) and microcontrollers for digital processing. The device also features a wide bandwidth of 500kHz, which enables it to accurately track fast current transients and manage dynamic loads efficiently.

The MAX4080SAUA boasts a low offset voltage of only 250µV (max) and a low input bias current, ensuring high accuracy in current measurement. This low offset is particularly beneficial in applications where current sense is critical to detect low-level signals without significant error.

Additionally, the device includes a high common-mode rejection ratio (CMRR) of 120dB (typ) at DC, which allows for stable operation even in the presence of high common-mode voltages, a common scenario in high-side current sensing applications. The operating temperature range of -40°C to +125°C ensures reliable performance across a wide range of environmental conditions.

In summary, the MAX4080SAUA is a robust, high-performance current-sense amplifier that offers a simple and effective solution for high-side current monitoring in various electronic systems, providing designers with a reliable tool for power management and protection.