Low-Cost, SOT23, Voltage-Output, High-Side Current-Sense Amplifier

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Part Details
  • Low-Cost, Compact Current-Sense Solution
  • High Accuracy +2V to +28V Common-Mode Range, Functional Down to 0V, Independent of Supply Voltage
  • Three Gain Versions Available
    • +20V/V (MAX4173T)
    • +50V/V (MAX4173F)
    • +100V/V (MAX4173H)
  • ±0.5% Full-Scale Accuracy
  • ±3mV Input Offset Voltage (MAX4173T)
  • Wide 1.7MHz Bandwidth (MAX4173T)
  • 420µA Supply Current
  • Available in Space-Saving SOT23 Package
Additional Details
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The MAX4173 low-cost, precision, high-side current-sense amplifier is available in a tiny SOT23-6 package. It features a voltage output that eliminates the need for gain-setting resistors and it is ideal for today's notebook computers, cell phones, and other systems where current monitoring is critical. High-side current monitoring is especially useful in battery-powered systems, since it does not interfere with the ground path of the battery charger. The input common-mode range of 0 to +28V is independent of the supply voltage and ensures that the current-sense feedback remains viable even when connected to a battery in deep discharge. The MAX4173's wide 1.7MHz bandwidth makes it suitable for use inside battery charger control loops.

The combination of three gain versions and a user-selectable external sense resistor sets the full-scale current reading. This feature offers a high level of integration, resulting in a simple and compact current-sense solution.

The MAX4173 operates from a single +3V to +28V supply, typically draws only 420µA of supply current over the extended operating temperature range (-40°C to +85°C), and is offered in the space-saving SOT23 package.

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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1


Evaluation Kit for the MAX4173



Evaluation Kit for the MAX4173

Evaluation Kit for the MAX4173

Features and Benefits

  • Real-Time Current Monitoring
  • Wide 0 to 28V Input Common-Mode Range Independent of Operating Supply Voltage
  • ±0.5% Full-Scale Accuracy
  • Lead(Pb)-Free and RoHS Compliant
  • Fully Assembled and Tested

Product Detail

The MAX4173 evaluation kit (EV kit) is a fully assembled and tested surface-mount PCB that contains a MAX4173TEUT+. The MAX4173 is a high-side, current-sense amplifier with an input common-mode voltage range that extends from 0 to 28V. The current-sense amplifier provides an analog voltage output proportional to the load current flowing through an external sense resistor.

The 20V/V gain version of the MAX4173 (MAX4173TEUT+) and a 150mΩ sense resistor are installed on the board. Other gain versions of the MAX4173 can be evaluated by replacing the MAX4173TEUT+ with a MAX4173FEUT+ (50V/V) or a MAX4173HEUT+ (100V/V) and a user-supplied, external sense resistor. The user can easily match the full-scale sense voltage to the required output-voltage range.


  • Cell Phones
  • General System/Board-Level Current Monitoring
  • Notebook Computers
  • PA Bias Control
  • Portable Battery-Powered Systems
  • Power-Management Systems
  • Precision Current Sources
  • Smart Battery Packs/Chargers

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