MAX4373FESA

Overview

The MAX4373FESA+ 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 features a 0V to +28V common-mode input range independent of supply voltage. The comparator includes a latching output controlled by a RESET pin. The 'F' suffix indicates a fixed internal gain of +50V/V. It is housed in an 8-pin SO package.

Feature Summary

• Integrated high-side current-sense amplifier with voltage output eliminates need for external gain-setting resistors
• Latching open-drain comparator output prevents oscillation during overcurrent shutdown events
• 0V to +28V common-mode input range ensures functionality even during deep battery discharge
• Internal bandgap reference provides stable threshold for precise current monitoring

Applications

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

Procurement Notes

Verify the specific suffix 'F' confirms the +50V/V gain configuration required for the design. Ensure the '+T' or standard tape-and-reel packaging matches assembly needs if applicable. Confirm RoHS compliance status via the manufacturer's latest documentation as ordering suffixes may indicate lead-free variations. Check for any recent lifecycle changes or obsolescence notices directly from Analog Devices.

Selection Notes

Select this component when a fixed +50V/V gain is optimal for the target full-scale sense voltage. It is suitable for applications requiring a latching fault flag without continuous oscillation. Consider the MAX4374 or MAX4375 variants if window detection capabilities are needed instead of simple overcurrent protection. Ensure the external sense resistor power rating accommodates the expected load currents.

Part Context

This part belongs to the MAX4373/MAX4374/MAX4375 family of micropower current-sense supervisors. The family differentiates primarily by gain options (+20V/V, +50V/V, +100V/V) and comparator configurations (single vs. dual). The MAX4373 specifically offers a single latching comparator, distinguishing it from the dual-comparator MAX4374/4375 models used for window detection.

Replacement Considerations

Direct substitutes within the same family include MAX4373TEUA+ (+20V/V gain) and MAX4373HEUA+ (+100V/V gain), provided the gain difference is acceptable. Other Maxim Integrated high-side current-sense amplifiers with similar voltage ranges and micropower characteristics may serve as alternatives if gain flexibility is permitted.