MAX4373HEUA-T

Overview

The MAX4373HEUA-T is a low-cost, micropower high-side current-sense supervisor integrating a current-sense amplifier, bandgap reference, and latching comparator. 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 (suffix H) and an 8-pin µMAX package. It supports a 0V to +28V common-mode input range independent of the supply voltage. Key electrical parameters include a maximum input offset voltage of 1mV, a full-scale accuracy of 2%, and a -3dB bandwidth of 200kHz.

Feature Summary

• Integrates a high-side current-sense amplifier, internal bandgap reference, and a latching comparator output to prevent oscillation during overcurrent events.
• Features a 0V to +28V common-mode input range that remains functional even when connected to battery packs in deep discharge conditions.
• Provides a voltage output proportional to the sense voltage, eliminating the need for external gain-setting resistors.

Applications

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

Procurement Notes

Verify the specific suffix 'H' confirms the +100V/V gain configuration required for the design. Confirm the 'U' package code corresponds to the 8-pin µMAX form factor. Ensure the '-T' designation matches the reel packaging specification if applicable. Cross-reference the RoHS compliance status indicated by the '+' symbol in the ordering information against environmental requirements.

Selection Notes

Select this component when a compact solution for high-side current monitoring is needed without external gain resistors. The +100V/V gain is suitable for applications requiring higher sensitivity with smaller sense resistors. Consider the latching comparator feature for critical power protection circuits where oscillation must be avoided. Verify that the 50µA supply current meets the system's power budget constraints.

Part Context

This part belongs to the MAX4373/MAX4374/MAX4375 family of supervisors. The MAX4373 variant includes one comparator, while the MAX4374 and MAX4375 add a second comparator for window detection functions. All variants share the same core amplifier architecture and are available in multiple gain versions (+20V/V, +50V/V, +100V/V) and packages.

Replacement Considerations

Public confirmed substitute part numbers: MAX4373FEUA+, MAX4373TEUA+.

FAQ

How does the MAX4373 handle overcurrent conditions?

The device uses a latching comparator output that shuts down the power supply without oscillating. The latch can be reset by pulsing the RESET pin low for at least 1.5µs.

What is the function of the CIN1 pin?

CIN1 serves as the positive input for the internal comparator. When the voltage at CIN1 rises above the 600mV internal reference, the comparator output latches into the open state.