MAX4373FESA+

Overview

The MAX4373FESA+ is a low-cost, micropower high-side current-sense supervisor featuring an integrated amplifier, comparator with latching output, and bandgap reference. It operates from a single +2.7V to +28V supply with a typical supply current of 50µA. The device provides a voltage output proportional to the sense resistor voltage drop, eliminating external gain-setting resistors. It features a 0V to +28V common-mode input range independent of supply voltage. The specific F suffix indicates a fixed gain of +50V/V. The package is an 8-pin SOIC.

Feature Summary

• Integrated high-side current-sense amplifier with internal bandgap reference and latching comparator output
• Voltage output eliminates need for external gain-setting resistors
• High accuracy over a wide 0V to +28V common-mode input range
• Low power consumption suitable for battery-powered systems

Applications

• Notebook computers
• Portable/battery-powered systems
• Smart battery packs and chargers
• Cell phones
• Power-management systems

Procurement Notes

Verify that the component matches the exact part number MAX4373FESA+. Confirm the package type is 8-pin SOIC. Ensure the suffix 'F' corresponds to the required +50V/V gain configuration. Check for RoHS compliance indicated by the '+' symbol. Validate the operating temperature range requirements against the specified -40°C to +85°C limits.

Selection Notes

Select this component when a high-side current monitoring solution with integrated protection is required. The +50V/V gain is suitable for applications where the sense voltage needs to be amplified significantly before reaching the comparator threshold. Consider the latching comparator feature if oscillation-free shutdown is necessary during overcurrent events. Ensure the supply voltage range aligns with the system's power rails.

Part Context

The MAX4373 is part of the MAX4373/MAX4374/MAX4375 family of low-cost, micropower high-side current-sense supervisors. These devices combine a current-sense amplifier, bandgap reference, and comparator in a single IC. The family offers different gain options (+20V/V, +50V/V, +100V/V) and varying numbers of comparators to support diverse current monitoring and window detection applications.

Replacement Considerations

MAX4373TEUA+

FAQ

What is the function of the RESET pin?

The RESET pin controls the latch function of the first comparator. Holding it low activates the latch, which can be reset by pulsing it low for at least 1.5µs.

How does the common-mode input range benefit battery monitoring?

The 0V to +28V common-mode range is independent of the supply voltage, allowing current monitoring even when the battery pack is in deep discharge.