Analog Devices Inc./Maxim Integrated MAX4173FEUT

Overview

MAX4173FEUT from Maxim Integrated is a precision high-side current-sense amplifier in SOT23-6 package, delivering 50V/V fixed gain, ±0.5% full-scale accuracy, 1.4MHz bandwidth, and 0–28V input common-mode range independent of supply voltage. It enables accurate battery current monitoring in notebook computers and smart chargers without disrupting ground paths.

For engineers reviewing the MAX4173FEUT datasheet, MAX4173FEUT pinout, MAX4173FEUT application, or MAX4173FEUT equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, and two confirmed alternative parts with documented functional differences.

Technical Context

The MAX4173FEUT uses an internal current-mirror architecture to convert differential sense voltage (V_RS+ – V_RS−) into a proportional voltage output, eliminating external gain-setting resistors. Its rail-to-rail input stage supports operation down to 0V common-mode while maintaining functionality at up to +28V - critical for deep-discharge battery monitoring.

It operates from a single +3V to +28V supply, draws only 420µA quiescent current across –40°C to +85°C, and delivers stable performance with <±3mV input offset voltage (typical) and 90dB common-mode rejection above +2V common-mode.

Key Specifications

Pinout & Package

SOT23-6 package with exposed pad (U6+2 outline), 1.6mm × 2.9mm footprint, RoHS-compliant, tape-and-reel delivery.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4173FEUT, INA210AIDCKR trades bandwidth and common-mode range for lower cost and better temperature stability, while LT6106IMS8#TRPBF offers higher gain and similar speed in a larger package - making MAX4173FEUT optimal for compact, high-voltage, moderate-gain current sensing where SOT23 size and 50V/V scaling are design-critical.

Availability

MAX4173FEUT is available at Aetrix Electronics and suitable for notebook computers, smart battery chargers, and industrial power-management systems requiring stable component supply and long-term production continuity.

Supply support for MAX4173FEUT 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 communications applications.

The MAX4173 family targets high-side current sensing in portable and battery-powered systems, emphasizing small size, wide common-mode range, and minimal external components to simplify power monitoring in space- and cost-constrained designs.

FAQ

What is the guaranteed common-mode input range for MAX4173FEUT?

The MAX4173FEUT guarantees a 0V to +28V common-mode input range independent of supply voltage, enabling reliable operation even when the battery voltage drops below 1V or rises to 24V systems. This specification is tested and guaranteed across the full –40°C to +85°C temperature range, and the device remains functional down to 0V - unlike many competitors that require ≥2V for specified accuracy. The MAX4173FEUT maintains this range whether powered from 3V or 28V.

Does MAX4173FEUT require external gain-setting resistors?

No, the MAX4173FEUT does not require external gain-setting resistors. It integrates a precision 50V/V gain stage using internal laser-trimmed resistors and a current-mirror architecture. This eliminates component count, layout sensitivity, and temperature drift associated with external resistor networks. The MAX4173FEUT delivers its full-scale output directly - for example, 100mV across the sense resistor yields exactly 5.0V at OUT - making it ideal for compact, high-reliability current-sense designs.

What is the maximum supply voltage for MAX4173FEUT?

The absolute maximum supply voltage for MAX4173FEUT is +30V, but its operational range is specified from +3V to +28V. Operation at +28V is fully characterized: supply current remains ≤1.0mA, total output error stays within ±5.75%, and common-mode rejection holds at ≥90dB. Exceeding +28V risks violating the guaranteed electrical characteristics, though the device will not be damaged until +30V is reached - a margin intended for transient spikes only.

Can MAX4173FEUT be used with a 5mΩ sense resistor for 10A current sensing?

Yes, MAX4173FEUT supports 10A sensing with a 5mΩ resistor: V_SENSE = 10A × 5mΩ = 50mV, yielding V_OUT = 50 × 50mV = 2.5V - well within its output swing capability. At this condition, the ±0.5% full-scale accuracy translates to ±250µV output error, and the ±3mV input offset contributes ≤±150µV additional error. The MAX4173FEUT's 1.4MHz bandwidth ensures clean step response, and its 420µA supply current avoids loading the 5mΩ shunt's low-impedance node.

Is MAX4173FEUT pin-compatible with other MAX4173 variants like MAX4173TEUT or MAX4173HEUT?

Yes, MAX4173FEUT is pin-compatible with MAX4173TEUT and MAX4173HEUT - all share identical SOT23-6 pinout, footprint, and terminal functions. The only difference is gain: 20V/V (T), 50V/V (F), and 100V/V (H). This allows direct substitution during prototyping or BOM optimization without layout changes. However, output voltage scaling changes proportionally - e.g., same 100mV sense input yields 2.0V (T), 5.0V (F), or 10.0V (H) - so downstream ADC or comparator thresholds must be adjusted accordingly.