MAX4375HEUB+

Overview

The MAX4375HEUB+ 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 0 to +28V common-mode input range independent of VCC. The device provides a voltage output proportional to the sense resistor drop and includes a latching open-drain comparator output controlled by CIN1. An additional comparator at CIN2 enables window detection functions. It consumes 50µA and is specified for -40°C to +85°C in a 10-pin µMAX package.

Feature Summary

• Integrated high-side current-sense amplifier with internal bandgap reference
• Latching open-drain comparator output prevents oscillation during overcurrent events
• Second comparator supports window-detection applications
• Zero-volt common-mode operation ensures monitoring 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 'U' corresponds to the 10-pin µMAX package and 'H' indicates the +100V/V gain version. Confirm the '+' suffix denotes lead-free/RoHS compliance. Ensure the operating temperature range matches the specific application requirements of -40°C to +85°C. Cross-reference pin configurations with the official datasheet to avoid confusion with SOIC variants.

Selection Notes

Select this part when high-side monitoring is required without interfering with the ground path. The +100V/V gain is suitable for applications requiring higher sensitivity or smaller sense resistors. The dual-comparator architecture allows for precise upper and lower current limits via window detection. Verify that the external pull-up voltage does not exceed 5V for the comparator outputs.

Part Context

This component belongs to the MAX4373/MAX4374/MAX4375 family of supervisors. While the MAX4373 offers a single comparator and the MAX4374 provides two comparators with specific polarity configurations, the MAX4375 adds a second comparator optimized for window detection. All variants share the same core amplifier and reference circuitry within the same package options.

Replacement Considerations

Public confirmed substitute part numbers: MAX4375FEUB+, MAX4375TEUB+

FAQ

How is the comparator latch reset?

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

What is the function of the CIN2 pin on the MAX4375?

CIN2 serves as the input for the second internal comparator, enabling window-detection functionality by comparing the sense voltage against the internal reference.

Can the device monitor current when the battery is deeply discharged?

Yes, the 0 to +28V common-mode input range is independent of the supply voltage, allowing current sensing even when connected to a battery pack in deep discharge.