MAX4374TEUB+

Overview

The MAX4374TEUB+ 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 typical supply current of 50µA. 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 unit includes a latching open-drain comparator output controlled by CIN1 and RESET pins. An additional comparator allows for window detection functions. The component is specified for operation within an extended temperature range of -40°C to +85°C.

Feature Summary

• Integrated high-side current-sense amplifier with internal bandgap reference
• Latching open-drain comparator output prevents oscillation during overcurrent events
• Second comparator enables window-detection functionality
• Voltage output eliminates need for external gain-setting resistors

Applications

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

Procurement Notes

Verify the package type matches the required board layout, as this part utilizes a 10-pin µMAX package. Confirm the gain version corresponds to the application's full-scale sense voltage requirements (+20V/V for this suffix). Ensure the operating environment stays within the specified -40°C to +85°C temperature range. Check that the supply voltage does not exceed the absolute maximum ratings to prevent permanent damage.

Selection Notes

Select this component when high-side monitoring is required without interfering with the ground path. The +20V/V gain is suitable for applications requiring lower sensitivity or higher full-scale currents compared to the +50V/V or +100V/V variants. The dual-comparator architecture supports complex protection schemes like window detection. Consider the 50µA quiescent current for strict power budget constraints in portable devices.

Part Context

This device belongs to the MAX4373/MAX4374/MAX4375 family of current-sense supervisors. The MAX4374 specifically adds a second comparator for window detection compared to the single-comparator MAX4373. The TEUB+ suffix indicates a +20V/V gain, 10-pin µMAX package, and lead-free/RoHS compliance. These ICs are designed to simplify current monitoring in battery-powered systems by integrating amplification and logic functions.

Replacement Considerations

Direct substitutes include other parts from the MAX4373/MAX4374/MAX4375 series with matching gain and package codes, such as MAX4374FEUB+ or MAX4374HEUB+. Verify pin compatibility and electrical characteristics before substitution.

FAQ

How does the latching comparator output function?

The comparator output at COUT1 latches into the open state when CIN1 exceeds the 600mV reference. It remains latched until the RESET pin is pulsed low for at least 1.5µs.

What is the purpose of the second comparator?

The second comparator, accessible via CIN2 and COUT2, allows for window-detection functions by monitoring current levels against upper and lower thresholds simultaneously.

Can the device monitor deep discharge battery packs?

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