MAX4373HEUA+

Overview

The MAX4373HEUA+ is a low-cost, micropower high-side current-sense supervisor integrating a current-sense amplifier, bandgap reference, and latching comparator. It operates from a single +2.7V to +28V supply with a typical supply current of 50µA. The device features a +100V/V gain version, a 0V to +28V common-mode input range independent of supply voltage, and an operating temperature range of -40°C to +85°C. It is housed in an 8-pin µMAX package.

Feature Summary

• Integrates a high-side current-sense amplifier, internal bandgap reference, and a latching comparator output to eliminate oscillation during overcurrent events.
• Features a wide 0V to +28V common-mode input range that remains functional even when the supply voltage drops to zero, ensuring monitoring capability during deep battery discharge.
• Provides a voltage output proportional to the sense resistor voltage drop, removing the need for external gain-setting resistors.

Applications

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

Procurement Notes

Verify the specific suffix 'H' corresponds to the required +100V/V gain configuration before procurement. Confirm the 'EUA+' designation matches the 8-pin µMAX package requirement. Ensure the component meets lead-free and RoHS compliance standards as indicated by the '+' suffix. Cross-reference the manufacturer's latest ordering information to confirm availability status.

Selection Notes

Select this part when a high-side current-sensing solution with integrated protection logic is required. The +100V/V gain is suitable for applications requiring high sensitivity with small sense voltages. Consider the latching comparator feature if system shutdown upon fault detection is necessary without continuous oscillation. Verify that the 50µA supply current aligns with strict power budget constraints.

Part Context

This component belongs to the MAX4373/MAX4374/MAX4375 family of low-cost, micropower current-sense supervisors. The family differentiates primarily by the number of comparators: the MAX4373 includes one latching comparator, while the MAX4374 and MAX4375 add a second comparator for window-detection functions. All variants share the same core amplifier architecture and package options.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.