MAX4375HESD+T

Overview

The MAX4375HESD+T 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 supply voltage. The specific H suffix indicates a fixed gain of +100V/V. The comparator output latches to prevent oscillation during overcurrent events.

Feature Summary

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

Applications

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

Procurement Notes

Verify that the component matches the exact part number MAX4375HESD+T, specifically confirming the 'H' gain variant (+100V/V) and the '+T' tape-and-reel packaging suffix. Ensure the manufacturer is Analog Devices Inc./Maxim Integrated. Confirm RoHS compliance status as indicated by the '+' designation in the ordering information.

Selection Notes

Select this component when a second comparator is required for window-detection applications alongside standard current limiting. The +100V/V gain is suitable for detecting lower full-scale sense voltages compared to other variants. Verify that the system requires a latching output to maintain a turn-off flag without oscillation. Ensure the application supports the extended operating temperature range of -40°C to +85°C.

Part Context

This device belongs to the MAX4373/MAX4374/MAX4375 family of micropower current-sense supervisors. While the MAX4373 offers a single comparator and the MAX4374 provides dual comparators, the MAX4375 adds a second comparator configured for window detection. All variants share the same core amplifier architecture and power specifications but differ in comparator configuration and pinout availability.

Replacement Considerations

Public confirmed substitute part numbers: MAX4375FESD+, MAX4375TESD+

FAQ

How does the MAX4375 handle overcurrent conditions?

The MAX4375 utilizes a latching comparator output that remains in the open state once the threshold is exceeded, preventing oscillation until the RESET pin is pulsed low.

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

The CIN2 pin serves as the positive input for the second internal comparator, enabling window-detection functions by allowing the user to set a secondary current threshold.