MAX4373TEUA+TG071

Overview

The MAX4373TEUA+ 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 the supply voltage. The specific TEUA variant offers a fixed gain of +20V/V in an 8-pin µMAX package.

Feature Summary

• Integrated high-side current-sensing solution simplifies monitoring by combining an amplifier, comparator, and reference.
• Latching comparator output prevents oscillation during overcurrent events, providing a stable turn-off flag.
• Voltage output architecture removes the need for external gain-setting resistors.
• Common-mode input range extends from 0V to +28V, ensuring functionality even during deep battery discharge.

Applications

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

Procurement Notes

Verify that the ordering suffix corresponds to the correct gain version (+20V/V) and package type (8-pin µMAX). Confirm RoHS compliance status as indicated by the '+' designation. Ensure the operating temperature range matches the application requirements (-40°C to +85°C). Cross-reference the manufacturer part number with official Analog Devices documentation to confirm availability and revision history.

Selection Notes

Select this component when a compact, high-side current monitor is required for battery-powered systems. The +20V/V gain is suitable for applications requiring lower sensitivity or higher full-scale current ranges compared to the +50V/V or +100V/V variants. The latching output is critical for protecting loads without continuous oscillation. Consider the 8-pin µMAX package for space-constrained PCB layouts.

Part Context

This device belongs to the MAX4373/MAX4374/MAX4375 family of current-sense supervisors. The MAX4373 specifically includes one comparator, whereas the MAX4374 and MAX4375 include two comparators for window detection functions. All variants share the same core amplifier and reference circuitry but differ in pin count and comparator configuration.

Replacement Considerations

Direct substitutes within the same family include MAX4373TESA+ (SOIC package) or other gain variants like MAX4373FEUA+ (+50V/V) and MAX4373HEUA+ (+100V/V), provided the gain difference is acceptable for the circuit design.

FAQ

How does the MAX4373 handle overcurrent conditions?

The device uses a latching comparator output. When the sense voltage exceeds the internal 600mV reference, the output latches open-drain OFF. This state persists until the RESET pin is pulsed low for at least 1.5µs.

What is the purpose of the RESET pin?

The RESET pin controls the latch function of the first comparator. Holding it low disables the latch, making the output transparent. Pulsing it low resets the latch after an overcurrent event.

Can the MAX4373 be used for low-side sensing?

Yes, it can be used for low-side sensing, but total output error increases if the RS+ voltage falls below 2V. High accuracy is guaranteed for common-mode voltages between +2V and +28V.