MAX4373FESA+T

Overview

The MAX4373FESA+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 50µA typical supply current. 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. The specific F suffix indicates a fixed gain of +50V/V. It is housed in an 8-pin SO package and specified for operation between -40°C and +85°C.

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 battery discharge monitoring

Applications

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

Procurement Notes

Verify the component status as the MAX4373 series may be discontinued or have limited availability depending on the region. Confirm that the 'T' suffix denotes tape-and-reel packaging if required by assembly equipment. Ensure the '+T' designation aligns with lead-free and RoHS compliance requirements for the target manufacturing process. Cross-reference the exact ordering code against the manufacturer's latest distribution channels.

Selection Notes

Select this part when a fixed +50V/V gain is appropriate for the application's full-scale sense voltage. Verify that the maximum load current produces a sense voltage within the device's limits (150mV max for this gain). Ensure the system supply voltage remains above 2.7V. Consider the latching comparator feature if simple overcurrent shutdown without oscillation is required. Check that the 8-pin SO package fits the board layout constraints.

Part Context

The MAX4373 belongs to a family of supervisors that includes the MAX4374 and MAX4375. While the MAX4373 offers a single latching comparator, the MAX4374 and MAX4375 provide an additional comparator for window detection functions. All variants share the same core current-sense amplifier architecture and power specifications but differ in comparator count and pin configurations for 8-pin and 10/14-pin packages.

Replacement Considerations

Direct functional substitutes within the same family include the MAX4373TEUA+T (+20V/V gain) and MAX4373HEUA+T (+100V/V gain), provided the package type matches. Other Maxim Integrated current-sense amplifiers may serve as replacements if gain accuracy, bandwidth, and package dimensions are compatible.