Analog Devices Inc./Maxim Integrated MAX4372TEUK

Overview

MAX4372TEUK from Maxim Integrated is a precision high-side current-sense amplifier in SOT23-5 package, delivering 20V/V fixed gain, 0.18% full-scale accuracy, 0.3mV input offset voltage, and 30µA supply current. It operates from 2.7V to 28V with 0–28V input common-mode range independent of supply voltage, enabling accurate battery discharge monitoring in notebook computers and portable systems.

For engineers reviewing the MAX4372TEUK datasheet, MAX4372TEUK pinout, MAX4372TEUK application, or MAX4372TEUK equivalent, this device supports low-power, high-accuracy DC current sensing where ground-path integrity and micropower operation are critical-especially in battery-powered systems requiring stable full-scale sense voltage at deep discharge.

Technical Context

The MAX4372TEUK implements a high-side sensing architecture using internal current-mirror amplification and precision resistive feedback to generate a voltage output proportional to (V_RS+ – V_RS−). Its input common-mode range extends down to 0V regardless of V_CC, ensuring functionality during 2-cell Li-ion battery deep discharge (e.g., <2.0V/cell).

It features rail-to-rail output swing capability (V_OUT = V_CC – 0.25V typical), 1.5Ω output impedance, and 50kHz –1dB bandwidth at 20V/V gain. The device avoids external gain-setting resistors and eliminates ground path interference-critical for smart-battery chargers and portable power management systems.

Key Specifications

Pinout & Package

SOT23-5 package (5-pin, RoHS-compliant, tape-and-reel); 2.9mm × 1.6mm footprint; thermal pad not present; rated for -40°C to +85°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4372TEUK, MAX4080TASA+ offers higher bandwidth at cost of 2.5× supply current and larger SO-8 footprint, while INA199A1DCKR provides superior offset but lacks the 20V/V option and consumes double the quiescent power-making MAX4372TEUK optimal for space-constrained, battery-critical DC monitoring.

Availability

MAX4372TEUK is available at Aetrix Electronics and suitable for notebook computers, smart-battery chargers, and portable medical devices requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for MAX4372TEUK 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 interface applications, with emphasis on high reliability and integration density.

The MAX4372 product line delivers micropower, high-side current-sense amplifiers optimized for battery-powered systems where ground-path integrity, low quiescent current, and wide common-mode range are essential design requirements.

FAQ

What is the maximum common-mode voltage the MAX4372TEUK can measure?

The MAX4372TEUK supports a 0V to 28V input common-mode range that is fully independent of its supply voltage (V_CC). This means it can accurately sense current even when V_RS+ = 28V and V_CC = 2.7V - a key capability for monitoring deeply discharged 2-cell Li-ion batteries or high-voltage industrial rails without level-shifting circuitry. The MAX4372TEUK maintains specified accuracy across this entire range.

Does the MAX4372TEUK require external gain-setting resistors?

No, the MAX4372TEUK does not require external gain-setting resistors. It integrates precision internal resistive feedback to deliver a fixed 20V/V gain, producing a voltage output directly proportional to the sensed differential voltage (V_RS+ – V_RS−). This eliminates component count, layout sensitivity, and temperature drift associated with discrete resistor networks - a core design advantage of the MAX4372TEUK.

Can the MAX4372TEUK operate from a 3.3V supply while monitoring a 12V battery rail?

Yes, the MAX4372TEUK can operate from a 3.3V supply while monitoring a 12V battery rail. Its input common-mode range (0V to 28V) is independent of V_CC, so V_RS+ may be at 12V while V_CC = 3.3V. The output will swing up to ~3.05V (V_CC – 0.25V), which remains compatible with 3.3V ADC references. This dual-rail capability is a defining feature of the MAX4372TEUK.

What is the full-scale accuracy specification for the MAX4372TEUK?

The MAX4372TEUK guarantees ±0.18% full-scale accuracy over temperature (–40°C to +85°C), measured at V_CC = V_RS+ = 12V and V_SENSE = 100mV. This translates to ±1.8mV absolute error at 1V output, enabling high-fidelity current measurement in applications such as battery fuel gauging and precision power budgeting where the MAX4372TEUK is commonly deployed.

Is the MAX4372TEUK pin-compatible with other variants like MAX4372FEUK or MAX4372HEUK?

Yes, the MAX4372TEUK, MAX4372FEUK, and MAX4372HEUK share identical SOT23-5 pinout, package dimensions, and electrical interface - differing only in fixed gain (20V/V, 50V/V, 100V/V). This allows direct substitution in the same PCB footprint when adjusting full-scale current range via sense resistor value, without layout changes. All three variants maintain identical accuracy, supply current, and common-mode performance - a key interoperability feature of the MAX4372TEUK family.