MAX4374HEUB+T

Overview

The MAX4374HEUB+T is a low-cost, micropower high-side current-sense supervisor integrating a current-sense amplifier, bandgap reference, and comparator with latching output. 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, an input common-mode range of 0V to +28V independent of the supply voltage, and a full-scale accuracy of ±2% (max). It includes a second comparator for window-detection functions and is specified for operation over an extended temperature range of -40°C to +85°C.

Feature Summary

• Integrates a high-side current-sense amplifier, internal bandgap reference, and comparators into a single compact solution.
• Features a latching comparator output that provides a stable turn-off flag without oscillation during overcurrent events.
• Includes a second comparator dedicated to window-detection applications for precise current monitoring.
• Operates with a wide common-mode input range independent of the supply voltage, ensuring functionality even in deep discharge conditions.

Applications

• Notebook Computers
• Portable/Battery-Powered Systems
• Smart Battery Packs/Chargers
• Cell Phones
• Power-Management Systems

Procurement Notes

Verify the specific ordering suffix against official manufacturer documentation to confirm package type and RoHS compliance status. Ensure the selected variant matches the required gain configuration (+100V/V) and operating temperature range (-40°C to +85°C). Confirm pinout compatibility with the target PCB footprint before finalizing procurement decisions.

Selection Notes

Select this component when high-side current monitoring is required without interfering with the ground path. The integrated latching comparator simplifies overcurrent protection circuits by preventing oscillation. The additional comparator supports window detection for systems requiring both upper and lower current limits. Verify that the external sense resistor can handle the expected power dissipation.

Part Context

This part belongs to the MAX4373/MAX4374/MAX4375 family of micropower current-sense supervisors. The MAX4374 specifically adds a second comparator compared to the MAX4373, enabling window detection capabilities not available in the base model. These devices are designed to replace discrete solutions, reducing board space and component count in portable electronics.

Replacement Considerations

Direct substitutes within the same family include MAX4373HEUB+T (single comparator) and MAX4375HEUB+T (inverted second comparator polarity). Cross-vendor replacements require careful evaluation of gain accuracy, common-mode range, and latch functionality to ensure circuit compatibility.

FAQ

How does the latching comparator function?

The comparator output latches into an open state when CIN1 exceeds the internal reference. This state persists until the RESET pin is pulsed low for at least 1.5µs, preventing oscillation during fault conditions.

What is the purpose of the second comparator?

The second comparator allows for window-detection functions. By connecting COUT1 and COUT2, the device can indicate if the load current falls within or outside a specific defined window.

Can the device monitor battery current in deep discharge?

Yes, the 0V to +28V input common-mode range is independent of the supply voltage, allowing current monitoring to remain viable even when connected to a battery pack in deep discharge.