MAX4374HESD+T

Overview

The MAX4374HESD+T 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 50µA typical supply current. The device provides a voltage output proportional to the sense resistor drop, eliminating external gain-setting resistors. It includes a latching comparator output for overcurrent protection and a second comparator for window detection functions. The input common-mode range extends from 0V to +28V, independent of the supply voltage.

Feature Summary

• Integrated high-side current-sense amplifier with internal bandgap reference
• Latching comparator output prevents oscillation during fault conditions
• Second comparator enables window-detection functionality
• Voltage output eliminates need for external gain-setting resistors

Applications

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

Procurement Notes

Verify the package type matches the required board layout, as this component is available in multiple pin configurations including SOIC and µMAX variants. Confirm that the specific suffix indicates the correct gain version (+100V/V) and temperature rating (-40°C to +85°C). Ensure the ordering code aligns with lead-free/RoHS compliance requirements if mandated by the design specifications.

Selection Notes

Select this part when both current monitoring and fault protection are required in a compact form factor. The +100V/V gain is suitable for applications requiring high sensitivity with smaller sense resistors. Consider the MAX4373 if only a single comparator is needed, or the MAX4375 if the second comparator polarity must be inverted for specific window detection logic.

Part Context

This component belongs to the MAX4373/MAX4374/MAX4375 family of high-side current-sense supervisors manufactured by Maxim Integrated (now Analog Devices). These devices are designed to simplify battery management and power monitoring in portable electronics by combining sensing and protection capabilities into a single IC.

Replacement Considerations

Direct functional substitutes within the same family include MAX4373HESD+T (single comparator) and MAX4375HESD+T (inverted second comparator polarity). Verify pin compatibility and gain accuracy before substitution.

FAQ

How does the MAX4374 handle latch reset?

The latching comparator output can be reset by pulsing the RESET pin low for at least 1.5µs. Holding RESET low keeps the latch transparent.

What is the purpose of the second comparator?

The second comparator allows for window-detection functions, enabling the monitoring of current within a specific upper and lower threshold range.