MAX4375HESD+

Overview

The MAX4375HESD+ 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 0 to +28V common-mode input range independent of VCC. The device features a voltage output eliminating gain-setting resistors and offers three gain versions: T (+20V/V), F (+50V/V), and H (+100V/V). It consumes 50µA and includes a second comparator for window-detection functions.

Feature Summary

• Integrates a high-side current-sense amplifier, internal bandgap reference, and dual comparators into a single compact solution.
• Features a latching comparator output that provides a stable turn-off flag without oscillation during overcurrent events.
• Includes a second comparator specifically designed to enable window-detection applications for precise current monitoring.
• Maintains high accuracy across the full 0V to +28V common-mode input range, ensuring viability even in deep-discharge battery scenarios.

Applications

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

Procurement Notes

Verify the specific suffix 'SD+' indicates the 14-pin SO package and RoHS compliance. Confirm the 'H' designation corresponds to the +100V/V gain version required for your sensitivity settings. Ensure the operating temperature range matches the -40°C to +85°C specification. Cross-reference the pinout against the 14-pin SO layout to prevent integration errors.

Selection Notes

Select this component when both current amplification and hardware-based overcurrent protection are required. The integrated comparator removes the need for external logic gates. Choose the H gain variant for higher sensitivity applications requiring a +100V/V conversion factor. Consider the 14-pin SO package if board space allows for larger footprints compared to smaller alternatives.

Part Context

This device belongs to the MAX4373/MAX4374/MAX4375 family of high-side current-sense supervisors. While the MAX4373 offers a single comparator and the MAX4374 provides two comparators, the MAX4375 uniquely combines dual comparators with specific polarity configurations for window detection. All variants share identical power characteristics and amplifier performance.

Replacement Considerations

Direct functional substitutes within the same family include the MAX4374HESD+ (dual comparator) or MAX4373HESD+ (single comparator), provided the extra comparator functionality is not utilized. Verify package compatibility and gain specifications before substitution.

FAQ

How does the MAX4375 handle overcurrent conditions?

The device utilizes a latching comparator output that triggers when the sense voltage exceeds the internal reference. This latch prevents oscillation and maintains the fault state until explicitly reset via the RESET pin.

What is the purpose of the second comparator in the MAX4375?

The second comparator enables window-detection functions, allowing the system to monitor if the load current falls within a specific upper and lower threshold range rather than just detecting an overcurrent event.

Can the MAX4375 operate with a battery pack in deep discharge?

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