MAX4375HESD

Overview

The MAX4375HESD+ 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 0V to +28V common-mode input range independent of VCC. The device provides a voltage output proportional to the sense resistor drop and includes a latching open-drain comparator output for overcurrent protection. It offers a gain of +100V/V, consumes 50µA, and is specified for -40°C to +85°C in a 14-pin SO package.

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
• Voltage output eliminates external gain-setting resistors

Applications

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

Procurement Notes

Verify the suffix 'SD' corresponds to the 14-pin SO package and the 'H' indicates +100V/V gain. Confirm RoHS compliance via the '+' designation. Ensure the operating environment remains within the specified -40°C to +85°C temperature range. Check that the supply voltage does not exceed 28V and the common-mode voltage stays within 0V to 28V limits.

Selection Notes

Select this part when high-side monitoring is required without interfering with the ground path. The +100V/V gain suits applications requiring high sensitivity with small sense resistors. The dual comparators allow for precise window detection of load currents. Ensure the system can handle the latching behavior by providing a reset mechanism for the comparator output.

Part Context

Part of the MAX4373/MAX4374/MAX4375 family of current-sense supervisors. The MAX4375 variant specifically includes two comparators for window detection, unlike the MAX4373 which has one. The H suffix denotes the +100V/V gain version, while SD indicates the 14-pin SO package type.

Replacement Considerations

MAX4375FESD+ (Gain +50V/V)

FAQ

How is the comparator latch reset?

The latch is reset by pulsing the RESET pin low for at least 1.5µs. Holding RESET low keeps the latch transparent.

What is the function of CIN2 on the MAX4375?

CIN2 serves as the positive input for the second internal comparator, enabling window-detection functions when used with COUT2.

Can the device monitor battery current during deep discharge?

Yes, the 0V to +28V common-mode input range is independent of the supply voltage, allowing monitoring even when the battery pack is deeply discharged.