MAX4373FEUA+

Overview

The MAX4373FEUA+ is a low-cost, micropower high-side current-sense supervisor featuring an integrated amplifier, comparator, 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 drop, eliminating external gain-setting resistors. It features a +50V/V fixed gain, a 0V to +28V common-mode input range independent of supply voltage, and a latching open-drain comparator output. The component is specified for operation within an extended temperature range of -40°C to +85°C.

Feature Summary

• Integrated high-side current-sense amplifier with internal bandgap reference eliminates need for external gain-setting resistors
• Latching comparator output prevents oscillation during overcurrent shutdown events
• Common-mode input range extends from 0V to +28V, ensuring functionality even during deep battery discharge
• Micropower consumption of 50µA supports extended battery life in portable applications

Applications

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

Procurement Notes

Verify the specific suffix 'EUA+' corresponds to the 8-pin µMAX package configuration required for your layout. Confirm that the '+50' gain designation matches your full-scale sense voltage calculations. Ensure the operating environment remains within the specified -40°C to +85°C temperature limits. Check for lead-free/RoHS compliance status if required by your assembly process. Validate pinout compatibility against your existing schematic before finalizing procurement.

Selection Notes

Select this part when a fixed +50V/V gain is appropriate for your maximum load current and sense resistor value. Choose the µMAX package for space-constrained designs requiring surface-mount integration. Consider the MAX4374 or MAX4375 variants if window detection capabilities are necessary. Ensure the supply voltage range covers your system's minimum and maximum operating conditions. Verify that the latching output behavior aligns with your fault recovery strategy.

Part Context

This component belongs to the MAX4373/MAX4374/MAX4375 family of low-cost, micropower high-side current-sense supervisors. The family differentiates models by gain options (+20V/V, +50V/V, +100V/V) and comparator configurations (single vs. dual). The MAX4373 variant specifically includes one latching comparator, whereas other family members may offer additional comparators for window detection functions.

Replacement Considerations

Direct substitutes include MAX4373TEUA+ (Gain +20V/V) and MAX4373HEUA+ (Gain +100V/V) within the same package. Cross-family replacements like MAX4173 require verification of gain accuracy and common-mode range specifications.