MAX4373HESA-T

Overview

The MAX4373HESA-T 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 drop, eliminating external gain-setting resistors. It features a 0V to +28V common-mode input range independent of supply voltage, ensuring functionality during deep battery discharge. The part utilizes an 8-pin SOIC package.

Feature Summary

• Integrated high-side current-sense amplifier with internal bandgap reference
• Latching open-drain comparator output prevents oscillation during overcurrent events
• Voltage output eliminates need for external gain-setting resistors
• Common-mode input range extends to 0V, supporting deep-discharge monitoring

Applications

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

Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging configuration as per manufacturer ordering information. Confirm that the 'H' designation corresponds to the +100V/V gain version required for the application circuit design. Ensure compatibility with the 8-pin SOIC footprint during PCB layout verification.

Selection Notes

Select this component when high-side current monitoring is required without interfering with the ground path. The +100V/V gain is suitable for applications requiring higher sensitivity to small sense voltages. Verify that the system supply voltage remains within the 2.7V to 28V operational range and that the common-mode voltage does not exceed 28V.

Part Context

This device belongs to the MAX4373/MAX4374/MAX4375 family of supervisors. The MAX4373 variant includes a single latching comparator, whereas the MAX4374 and MAX4375 include a second comparator for window-detection functions. All variants share the same core current-sense amplifier architecture and power specifications.

Replacement Considerations

Compatible substitutes within the same family include MAX4373FESA+ (Gain +50V/V) and MAX4373TEUA+ (Gain +20V/V). These parts maintain identical pinouts and functional characteristics but differ in amplifier gain settings.