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 gain of +100V/V, a common-mode input range of 0V to +28V independent of supply voltage, and an operating temperature range of -40°C to +85°C. Packaged in an 8-pin µMAX, it provides a voltage output proportional to the sense resistor voltage.

Feature Summary

• Integrates a high-side current-sense amplifier, internal bandgap reference, and latching comparator for simplified overcurrent protection.
• Features a 0V to +28V common-mode input range that remains functional even during deep battery discharge conditions.
• Provides a latching open-drain output to prevent oscillation during fault conditions, requiring a reset pulse to clear.

Applications

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

Procurement Notes

Verify the specific suffix HEUA+T corresponds to the +100V/V gain variant in the 8-pin µMAX package. Confirm RoHS compliance status as indicated by the plus sign. Ensure the design accounts for the latching comparator behavior, which requires a dedicated RESET signal to clear the output state after an overcurrent event.

Selection Notes

Select this component when high-side monitoring is required without interfering with the ground path. The +100V/V gain is suitable for applications requiring higher output voltage swing from small sense voltages. Consider the 0V to +28V common-mode range for compatibility with various battery pack voltages. Verify that the external sense resistor can handle the expected power dissipation.

Part Context

This part belongs to the MAX4373/MAX4374/MAX4375 family of supervisors. The MAX4373 variant includes a single comparator, whereas the MAX4374 and MAX4375 include two comparators for window detection functions. All variants share the same core amplifier architecture and are available in multiple gain options and package types.

Replacement Considerations

Direct substitutes within the same family include MAX4373FEUA+T (+50V/V) and MAX4373TEUA+T (+20V/V). For dual-comparator functionality, consider MAX4374 or MAX4375 equivalents. Cross-family replacements require verification of pinout compatibility and electrical parameter alignment.

FAQ

How is the latching comparator output cleared?

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

What is the maximum output voltage?

The output voltage is internally clamped to not exceed 12V.

Can the device be used for low-side sensing?

Yes, but total output voltage error increases when the RS+ voltage falls below 2V.