MAX4373HESA

Overview

The MAX4373HESA+ is a low-cost, micropower high-side current-sense supervisor integrating a current-sense amplifier, bandgap reference, and latching comparator. It operates from a single +2.7V to +28V supply with a 0V to +28V common-mode input range independent of VCC. The device features a fixed gain of +100V/V, consuming 50µA typical supply current. It provides a voltage output proportional to the sense resistor voltage, eliminating external gain-setting resistors.

Feature Summary

• Integrated high-side current-sensing solution with internal bandgap reference and latching comparator
• Voltage output design eliminates need for external gain-setting resistors
• Latching comparator output prevents oscillation during overcurrent events
• Operates down to 0V common-mode voltage for deep battery discharge monitoring

Applications

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

Procurement Notes

Verify the specific suffix 'E' corresponds to the 8-pin SO package and 'H' indicates the +100V/V gain configuration. Confirm RoHS compliance via the '+' designation in the part number. Ensure the ordering code matches the required temperature range of -40°C to +85°C. Cross-reference the manufacturer's latest datasheet revision to confirm pinout and electrical characteristics remain unchanged.

Selection Notes

Select this component when high-side monitoring is required without interfering with the ground path. The +100V/V gain suits applications requiring higher sensitivity for smaller sense voltages. Verify that the maximum output voltage does not exceed the system's logic levels or ADC input ranges. Consider the latching feature if immediate power cutoff upon overcurrent is necessary.

Part Context

This device belongs to the MAX4373/MAX4374/MAX4375 family of micropower current-sense supervisors. While the MAX4373 offers a single latching comparator, the MAX4374 and MAX4375 variants include an additional comparator for window detection functions. All variants share the same core amplifier architecture and power specifications.

Replacement Considerations

Compatible substitutes within the same family include MAX4373FEUA+, MAX4373TEUA+, and other gain variants like MAX4373FESA+ or MAX4373TESA+. These parts maintain identical pinouts and functionality but differ in amplifier gain settings (+50V/V or +20V/V).

FAQ

How does the RESET pin function during power-up?

To prevent false latching, the RESET pin must be held low until the VCC supply rises above the minimum operating voltage of 2.7V. An external RC circuit can be used to ensure RESET remains low during the power-up transient.

What is the purpose of the CIN1 and CIN2 pins?

CIN1 serves as the positive input for the primary latching comparator. CIN2 is available on MAX4374/MAX4375 devices to provide a second comparator input for window detection applications, allowing monitoring of current within a specific upper and lower threshold.