MAX4375TEUB+T

Overview

The MAX4375TEUB+T is a low-cost, micropower high-side current-sense supervisor integrating an amplifier, comparator, and bandgap reference. It operates from a single +2.7V to +28V supply with a typical supply current of 50µA. The device features a +20V/V gain version in a 10-pin µMAX package. It supports a 0 to +28V input common-mode range independent of the supply voltage. The comparator output is latching to prevent oscillation during overcurrent events.

Feature Summary

• Integrates a high-side current-sense amplifier, internal bandgap reference, and a latching comparator for simplified monitoring.
• Features a latching open-drain output that provides a stable turn-off flag without oscillation when an overcurrent condition occurs.
• Includes a second comparator dedicated to window-detection functions for precise upper and lower current limits.
• Operates with a wide 0V to +28V common-mode input range that remains functional even during deep battery discharge.

Applications

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

Procurement Notes

Verify the specific suffix TEUB+T against official documentation to confirm the +20V/V gain, 10-pin µMAX package, and lead-free status. Confirm the operating temperature range of -40°C to +85°C matches system requirements. Ensure the external sense resistor power dissipation capabilities are sufficient for the target load currents to maintain accuracy.

Selection Notes

Select this component when a compact solution for high-side current monitoring is required in battery-powered devices. The integrated latching comparator eliminates the need for external logic to handle fault states. The +20V/V gain is suitable for applications requiring higher full-scale sense voltages compared to higher gain variants. Verify that the 10-pin package fits the available board space constraints.

Part Context

This part belongs to the MAX4373/MAX4374/MAX4375 family of supervisors designed for portable electronics. While the MAX4373 offers a single comparator and the MAX4374 adds a second comparator for window detection, the MAX4375 specifically utilizes the second comparator with inverted polarity relative to the first. All variants share identical core amplifier characteristics and power consumption profiles.

Replacement Considerations

Direct substitutes within the same family include the MAX4374TEUB+T (window detection variant) or other gain versions such as MAX4375FEUB+T (+50V/V) and MAX4375HEUB+T (+100V/V). Cross-family replacements require verifying pin compatibility and ensuring the replacement meets the 0V to +28V common-mode range specification.

FAQ

How does the MAX4375 differ from the MAX4374?

Both devices feature two comparators for window detection. The difference lies in the polarity of the second comparator: the MAX4374's second comparator triggers on the positive terminal, while the MAX4375's triggers on the negative terminal, allowing flexibility in defining the current window limits.

What is the function of the RESET pin?

The RESET pin controls the latching state of the primary comparator output (COUT1). Holding RESET low disables the latch, making the output transparent. Pulsing RESET low for at least 1.5µs resets the latch after an overcurrent event has occurred.