MAX4373HESA+

Overview

The MAX4373HESA+ 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 50µA typical supply current. The device provides a voltage output proportional to the sense resistor voltage drop, eliminating external gain-setting resistors. It features a 0 to +28V input common-mode range independent of supply voltage, ensuring functionality during deep battery discharge. The unit includes a latching open-drain comparator output controlled by CIN1 and RESET pins.

Feature Summary

• Integrated high-side current-sense amplifier with internal bandgap reference
• Latching open-drain comparator output prevents oscillation during overcurrent events
• Voltage output eliminates need for external gain-setting resistors
• Operates with 0V to +28V common-mode range independent of supply voltage

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 specific part number denotes an 8-pin SOIC package. Confirm the gain version corresponds to the application requirements, as the 'H' suffix indicates a fixed gain of +100V/V. Ensure the operating temperature range meets system specifications, as the device is rated for -40°C to +85°C. Check for lead-free/RoHS compliance status if required by manufacturing standards.

Selection Notes

Select this component when a compact, high-side current monitoring solution is needed without external gain resistors. The +100V/V gain is suitable for applications requiring high sensitivity to small sense voltages. Consider the latching comparator feature if circuit protection against sustained overcurrent is necessary. Verify that the 50µA supply current aligns with strict power budget constraints in portable devices.

Part Context

This device belongs to the MAX4373/MAX4374/MAX4375 family of low-cost, micropower current-sense supervisors. While the MAX4373 offers a single comparator, the MAX4374 and MAX4375 variants include a second comparator for window detection functions. All variants share the same core amplifier architecture and power characteristics but differ in pin count and comparator availability.

Replacement Considerations

Direct substitutes within the same family include MAX4373TEUA+, MAX4373TESA+, MAX4373FEUA+, and MAX4373FESA+. These parts offer different gain configurations (+20V/V or +50V/V) but maintain identical pinouts and functionality. Cross-family replacements require verification of gain accuracy, common-mode range, and package dimensions.