MAX4373TESA+T

Overview

The MAX4373TESA+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 typical supply current of 50µA. The device provides a voltage output proportional to the sense resistor voltage drop, utilizing a fixed gain of +20V/V. It supports a common-mode input range of 0V to +28V, independent of the supply voltage. The unit includes a latching open-drain comparator output controlled by a RESET pin, ensuring stable operation without oscillation during overcurrent events.

Feature Summary

• Integrates a high-side current-sense amplifier, internal bandgap reference, and a latching comparator into a single compact solution.
• Features a latching open-drain comparator output that prevents oscillation during overcurrent conditions, requiring a dedicated reset pulse to clear.
• Provides a voltage output proportional to the differential voltage across the external sense resistor, eliminating the 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 specific suffix 'ESA' corresponds to the 8-pin SO package when sourcing replacements or verifying compatibility. Confirm RoHS compliance status as indicated by the '+' designation in the part number. Ensure the design accounts for the latching nature of the comparator output, which requires active resetting via the RESET pin to resume normal monitoring operations after a trip event.

Selection Notes

Select this component when a high-side current monitor with integrated fault protection is required. The fixed +20V/V gain is suitable for applications where the maximum expected load current produces a sense voltage within the linear output range. Consider the latching comparator feature if system stability against transient noise is critical. Verify that the external sense resistor power dissipation ratings are sufficient for the target current levels.

Part Context

This device belongs to the MAX4373/MAX4374/MAX4375 family of low-cost, micropower high-side current-sense supervisors. The MAX4373 variant specifically offers a single latching comparator, whereas the MAX4374 and MAX4375 include an additional comparator for window detection functions. All variants share the same core amplifier architecture and power specifications.

Replacement Considerations

MAX4373FEA+T (Gain +50V/V)

FAQ

How is the latching comparator output cleared?

The latch is cleared by pulsing the RESET pin low for at least 1.5µs. Holding the RESET pin low keeps the latch transparent.

What is the function of the CIN1 pin?

CIN1 serves as the positive input terminal for the internal comparator. When the voltage at CIN1 exceeds the internal 600mV reference, the comparator output latches open.