MAX4373FESA-T

Overview

The MAX4373FESA-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 voltage 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. The comparator output is latching to prevent oscillation during overcurrent events.

Feature Summary

• Integrated high-side current-sense amplifier with internal bandgap reference
• Latching open-drain comparator output prevents oscillation during fault conditions
• Voltage output eliminates need for external gain-setting resistors
• Common-mode input range extends from 0V to +28V regardless of supply voltage

Applications

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

Procurement Notes

Verify that the ordering suffix 'T' corresponds to the tape-and-reel packaging configuration required for automated assembly processes. Confirm that the 'F' designation matches the required +50V/V gain specification for the target circuit design. Ensure the SOIC-8 package type aligns with the printed circuit board footprint constraints. Cross-reference the manufacturer's latest documentation to confirm lead-free status and RoHS compliance requirements.

Selection Notes

Select this component when a fixed +50V/V gain is appropriate for the maximum expected load current and sense resistor value. Consider the latching comparator feature if system protection requires a persistent fault flag without oscillation. Evaluate the 50µA supply current against strict power budget constraints in battery-operated devices. Verify that the 0V to +28V common-mode range covers the full discharge cycle of the monitored battery pack.

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 add a second comparator for window detection functions. All variants share the same core current-sense amplifier architecture and offer gains of +20V/V, +50V/V, or +100V/V depending on the middle letter in the part number.

Replacement Considerations

MAX4373HESA+ (Gain +100V/V)

FAQ

How does the RESET pin function during power-up?

To prevent false latching, the RESET pin must be held low until the VCC supply rises above the minimum operating voltage of 2.7V. An external RC network can be used to maintain the low state during power-up.

What is the purpose of the latching comparator output?

The latching output ensures that once an overcurrent condition triggers the comparator, the output remains in the fault state even if the input signal drops below the threshold. This prevents oscillation and allows for a definitive turn-off flag.