MAX4374TESD

Overview

The MAX4374TESD+ is a low-cost, micropower high-side current-sense supervisor integrating a current-sense amplifier, bandgap reference, and comparator with latching output. It operates from a single +2.7V to +28V supply with a typical supply current of 50µA. The device features a 0 to +28V input common-mode range independent of the supply voltage. It offers a fixed gain of +20V/V, a maximum full-scale accuracy of 2%, and an operating temperature range of -40°C to +85°C in a 14-pin SOIC package.

Feature Summary

• Integrates a high-side current-sense amplifier, internal bandgap reference, and a latching comparator for simplified overcurrent protection without oscillation.
• Features a wide 0V to +28V common-mode input range that remains functional even during deep battery discharge or when exceeding the supply voltage.
• Includes a second comparator on the MAX4374 variant to enable window-detection functions for monitoring current within specific upper and lower limits.

Applications

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

Procurement Notes

Verify the part number suffix against official documentation to confirm package type and RoHS compliance status. Ensure the ordering code matches the required gain version (+20V/V) and pin configuration (14-SOIC). Cross-reference the manufacturer's latest datasheet revision to confirm availability and any potential design changes before finalizing procurement specifications.

Selection Notes

Select this component for applications requiring integrated high-side current monitoring with built-in fault detection. The +20V/V gain is suitable for sensing larger currents across higher-value sense resistors. Consider the MAX4374 specifically if window detection capabilities are needed alongside standard overcurrent limiting. Verify that the external sense resistor power dissipation ratings align with the expected load currents.

Part Context

This device belongs to the MAX4373/MAX4374/MAX4375 family of micropower current-sense supervisors. The MAX4374 distinguishes itself by providing two comparators: one for latching overcurrent shutdown and a second for window detection. It shares core amplifier characteristics with the MAX4373 and MAX4375 but offers expanded diagnostic functionality through its dual-comparator architecture.

Replacement Considerations

Direct substitutes within the same family include MAX4374FEUB+, MAX4374HEUB+, MAX4374FESD+, and MAX4374HESD+. These parts share identical pinouts and functionality but differ in gain settings (+50V/V or +100V/V) or package types (µMAX vs. SOIC). Verify gain requirements match the application design before substitution.

FAQ

How does the MAX4374 handle overcurrent conditions?

The MAX4374 uses a latching comparator output to shut down the power supply upon detecting an overcurrent condition. This latching feature prevents output oscillation. The latch can be reset by pulsing the RESET pin low for at least 1.5µs.

What is the purpose of the CIN2 pin on the MAX4374?

The CIN2 pin serves as the input for the second internal comparator, which allows the MAX4374 to perform window-detection functions. This enables monitoring whether the load current stays within defined upper and lower thresholds.

Can the MAX4374 monitor current when the battery is deeply discharged?

Yes, the device features a 0V to +28V input common-mode range that is independent of the supply voltage. This ensures current-sense feedback remains viable even when connected to a battery pack in deep discharge.