Analog Devices Inc./Maxim Integrated MAX4375FEUB+T

Overview

MAX4375FEUB+T from Maxim Integrated is a micropower, high-side current-sense amplifier with integrated comparator and 600mV bandgap reference, designed for overcurrent supervision in battery-powered systems. It features +50V/V fixed gain, 0V to +28V input common-mode range independent of supply voltage, ±2% full-scale accuracy, and latching comparator output. Used in smart battery chargers to monitor load current without disrupting ground paths.

For engineers reviewing the MAX4375FEUB+T datasheet, MAX4375FEUB+T pinout, MAX4375FEUB+T application, or MAX4375FEUB+T equivalent, key selection criteria include its 10-pin µMAX package, 50µA supply current, 0.1mV max input offset voltage, and dual-comparator support for window-detection functions in portable power management.

Technical Context

The MAX4375FEUB+T implements a high-side sensing architecture with rail-to-rail common-mode operation down to 0V, enabling reliable current monitoring during battery deep discharge. Its internal 600mV reference feeds two comparators: one latched (CIN1 → COUT1) for overcurrent flagging, and one unlatched (CIN2 ↔ COUT2) for window detection.

It uses a single-ended voltage-output amplifier stage with no external gain-setting resistors, eliminating layout sensitivity. The +50V/V gain version supports full-scale sense voltages of 150mV, delivering up to 7.5V output before internal clamping, and operates across +2.7V to +28V supply while consuming only 50µA.

Key Specifications

Pinout & Package

MAX4375FEUB+T is housed in a 10-pin µMAX® package (3mm × 3mm, 0.5mm pitch), RoHS-compliant and lead(Pb)-free. The package supports high-density PCB layouts and thermal performance suitable for portable electronics.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side current-sense amplifier applications.

Compared with MAX4374FEUB+, the MAX4375FEUB+T adds a second comparator for window detection without increasing supply current or package size; compared with INA219AIDR, it delivers deterministic analog response and 20× lower quiescent current for autonomous protection circuits.

Availability

MAX4375FEUB+T is available at Aetrix Electronics and suitable for smart battery chargers, notebook power rails, portable medical devices, and industrial handheld instruments requiring stable component supply across long production lifecycles.

Supply support for MAX4375FEUB+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for power management, sensing, and connectivity in demanding environments.

The MAX4375FEUB+T belongs to the MAX4373/MAX4374/MAX4375 family of high-side current-sense supervisors, engineered specifically for micropower, high-accuracy battery and DC rail monitoring in space-constrained portable systems.

FAQ

What is the function of the RESET pin on the MAX4375FEUB+T?

The RESET pin controls the latch behavior of the primary comparator (CIN1 → COUT1). When held high (>2.0V), COUT1 latches open upon overcurrent detection and stays latched until RESET is pulsed low (<0.8V) for ≥1.5µs. Holding RESET low makes the comparator transparent. This behavior is critical for reliable fault handling in the MAX4375FEUB+T's protection circuitry.

Does the MAX4375FEUB+T support low-side current sensing?

Yes, the MAX4375FEUB+T can be used for low-side sensing by connecting RS+ to the load side and RS− to ground. However, total output voltage error increases when VRS+ falls below 2V, as specified in the Electrical Characteristics table. For highest accuracy, high-side placement is recommended - a key design consideration for the MAX4375FEUB+T in battery systems.

What is the maximum output voltage of the MAX4375FEUB+T's OUT pin?

The MAX4375FEUB+T's OUT pin delivers a voltage proportional to sensed current: VOUT = 50 × VSENSE. With a full-scale VSENSE of 150mV, this yields 7.5V. The output is internally clamped at 12V, so it will not exceed that level regardless of overdrive. This clamping protects downstream circuitry and defines the usable dynamic range of the MAX4375FEUB+T's analog output.

How does the MAX4375FEUB+T achieve 0V common-mode operation?

The MAX4375FEUB+T achieves 0V common-mode operation through an input stage architecture decoupled from VCC. Its current-sense amplifier remains functional even when RS+ and RS− are at 0V - essential for monitoring deeply discharged batteries. This feature is guaranteed across the full -40°C to +85°C range and is a core specification distinguishing the MAX4375FEUB+T from conventional current-sense amplifiers.

Can the MAX4375FEUB+T be used for bidirectional current sensing?

No, the MAX4375FEUB+T is unidirectional. Its internal architecture assumes current flow from RS+ to RS−, and the 600mV comparator reference is fixed polarity. It cannot detect reverse current or generate negative output voltages. For bidirectional applications, a dedicated IC such as the MAX4080 or INA226 is required - the MAX4375FEUB+T is optimized strictly for high-side, single-direction overload supervision.