Analog Devices Inc./Maxim Integrated MAX4372HEUK-T

Overview

MAX4372HEUK-T from Maxim Integrated is a precision high-side current-sense amplifier with 100V/V fixed gain, operating from 2.7V to 28V supply and consuming only 30μA. It delivers 0.18% full-scale accuracy, 0.3mV input offset voltage, and 1.5Ω output impedance in a 5-pin SOT23 package-designed for battery current monitoring in notebook computers and smart-battery chargers.

For engineers reviewing the MAX4372HEUK-T datasheet, MAX4372HEUK-T pinout, MAX4372HEUK-T application, or MAX4372HEUK-T equivalent, key selection criteria include its 0–28V common-mode input range independent of supply voltage, voltage-output architecture eliminating external gain resistors, and suitability for low-power, space-constrained high-side sensing where ground-path integrity is critical.

Technical Context

The MAX4372HEUK-T implements a high-impedance current-mirror-based architecture that converts differential sense voltage (V_RS+ – V_RS−) into a proportional voltage output without requiring external feedback components. Its input stage operates with rail-to-rail common-mode capability down to 0V, enabling accurate current measurement even during deep battery discharge.

It features internal gain-setting (100V/V), low output impedance (1.5Ω), and stable operation with capacitive loads up to 1000pF. The device maintains ±0.18% full-scale accuracy at +25°C and supports fast settling (20µs to 1%) with 110kHz −3dB bandwidth at 100V/V gain.

Key Specifications

Pinout & Package

MAX4372HEUK-T is housed in a RoHS-compliant, lead(Pb)-free 5-pin SOT23 package (package code U5+1, outline 21-0057), measuring 2.9mm × 1.6mm × 1.1mm with gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4372HEUK-T, MAX4080TASA+ offers higher bandwidth but lower gain and larger package, while INA219AIDR provides digital intelligence at the cost of analog responsiveness and external component dependency.

Availability

MAX4372HEUK-T is available at Aetrix Electronics and suitable for notebook computer power monitoring, smart-battery charger interfaces, and portable medical device battery management requiring stable component supply and long-term production continuity.

Supply support for MAX4372HEUK-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, mixed-signal, and power management ICs for demanding industrial, computing, and portable applications.

The MAX4372 family targets high-side current sensing in space- and power-constrained systems, emphasizing micropower operation, supply-independent common-mode range, and voltage-output simplicity for seamless integration into battery-powered equipment.

FAQ

What is the maximum common-mode voltage the MAX4372HEUK-T can measure?

The MAX4372HEUK-T 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+ is at 28V while V_CC is as low as 2.7V-critical for monitoring deeply discharged 2-cell Li-ion batteries. The specification is guaranteed across the full −40°C to +85°C temperature range.

Does the MAX4372HEUK-T require external gain-setting resistors?

No, the MAX4372HEUK-T does not require external gain-setting resistors. It integrates a precise 100V/V gain stage internally, delivering a voltage output directly proportional to the sense resistor voltage drop (V_OUT = 100 × (V_RS+ – V_RS−)). This eliminates resistor matching errors, layout sensitivity, and board space typically needed for discrete gain networks-simplifying design and improving accuracy.

What is the typical supply current of the MAX4372HEUK-T, and how does it vary with supply voltage?

The MAX4372HEUK-T consumes only 30μA typical supply current across its full 2.7V to 28V operating range. According to the datasheet's "Supply Current vs. Supply Voltage" plot (toc01), current remains flat and stable-varying less than ±1μA from 2.7V to 28V under typical conditions (V_SENSE = 5mV). This ultra-low, voltage-invariant quiescent current enables always-on battery monitoring without significant runtime impact.

Can the MAX4372HEUK-T be used with a sense resistor smaller than 10mΩ?

Yes, the MAX4372HEUK-T can be used with sub-10mΩ sense resistors, but accuracy depends on offset voltage contribution. With 0.3mV typical input offset, a 5mΩ resistor carrying 1A produces only 5mV V_SENSE, making offset ~6% of full scale. To maintain <0.5% error, use R_SENSE ≥ 60mΩ for 1A loads-or apply system-level calibration. The device's 100V/V gain maximizes signal-to-offset ratio compared to lower-gain variants.

Is the MAX4372HEUK-T pin-compatible with other MAX4372 variants like the T or F versions?

Yes, the MAX4372HEUK-T is pin-compatible with MAX4372TEUK-T and MAX4372FEUK-T-same 5-pin SOT23 package, identical pinout (GND, OUT, V_CC, RS+, RS−), and identical footprint. Only the internal gain differs (20V/V, 50V/V, or 100V/V). This allows hardware reuse across current-sensing ranges; simply change the part number and adjust R_SENSE to maintain desired full-scale output voltage.