MAX4081

PRODUCTION

76V, High-Side, Current-Sense Amplifiers with Voltage Output

Current-Sense Amplifiers Achieve 0.1% Accuracy with Operation Up to 76V

Data Sheet (Rev. 6) Product Selection Table
Part Models
12
1ku List Price
Starting From $1.72
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Part Details

  • Ideal for High-Voltage Current Monitoring Applications
    • Wide 4.5V to 76V Input Common-Mode Range
    • Independent Operating Supply Voltage
  • High Accuracy and Low Quiescent Current Support Precision Application Requirements
    • ±0.1% Full-Scale Accuracy
    • Low 100µV Input Offset Voltage
    • Three Gain Versions Available
      • 5V/V (MAX4080F/MAX4081F)
      • 20V/V (MAX4080T/MAX4081T)
      • 60V/V (MAX4080S/MAX4081S)
    • 75µA Supply Current (MAX4080)
  • Flexible Current Sensing Supports Monitoring of Charge and Discharge of Batteries
    • Bidirectional (MAX4081) or Unidirectional(MAX4080) ISENSE
    • Reference Input for Bidirectional OUT (MAX4081)
  • Minimizes Required Board Space
    • 8-Pin µMAX Package
MAX4081
76V, High-Side, Current-Sense Amplifiers with Voltage Output
MAX4080, MAX4081: Typical Operating Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Design Note 1

Technical Articles 3

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Hardware Ecosystem

Parts Product Life Cycle Description
Current Sense Amplifiers 3
MAX4073
PRODUCTION Low-Cost, SC70, Voltage-Output, High-Side Current-Sense Amplifier
MAX4173
PRODUCTION Low-Cost, SOT23, Voltage-Output, High-Side Current-Sense Amplifier
MAX4070
PRODUCTION Bidirectional, High-Side, Current-Sense Amplifiers with Reference
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Tools & Simulations

SPICE Model 3

Evaluation Kits

MAX4080EVKIT

Evaluation Kit for the MAX4080 and MAX4081

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Features and Benefits

  • Real-Time Current Monitoring
  • Wide 4.5V to 76V Input Common-Mode Range Independent of Operating Supply Voltage
  • Bidirectional or Unidirectional ISENSE
  • ±0.1% Full-Scale Accuracy
  • 8-Pin µMAX Package
  • Fully Assembled and Tested

Product Details

The MAX4080 evaluation kit (EV kit) is a fully assembled and tested surface-mount printed-circuit board (PCB) that contains a MAX4080SAUA (8-pin µMAX®) IC. The MAX4080 is a high-side, current-sense amplifier with an input common-mode voltage range that extends from 4.5V to 76V. The current-sense amplifier provides an analog voltage output proportional to the load current flowing through an external sense resistor.

The EV kit can also be used to evaluate the MAX4081, which is a bidirectional version of the current-sense amplifier. The MAX4081's single output pin continuously monitors the transition from charge to discharge and avoids the need for a separate polarity output pin. The MAX4081 requires an external reference to set the zerocurrent output level (VSENSE = 0V). Charging current is represented by an output voltage from VREF to VCC, while discharge current is given from VREF to GND.

All gain versions of the MAX4080 and MAX4081 are footprint-compatible and the MAX4080SAUA can easily be replaced by a MAX4080FAUA, MAX4080TAUA, MAX4081FAUA, MAX4081TAUA, or MAX4081SAUA. With a combination of three gain versions (5V/V, 20V/V, 60V/V = F, T, S suffix) and a user-selectable, external sense resistor, the user can easily match the full-scale load current to the required output-voltage range.

For maximum versatility, these parts can operate with 76V input common-mode voltage at RS+ and RS- pins, independent of operating supply voltage (VCC) used. These parts also allow a large differential voltage between RS+ and RS- pins for high reliability. High-side current monitoring does not interfere with the ground path of the load being measured, making the MAX4080/MAX4081 particularly useful in a wide range of high-voltage systems.

Applications

  • 48V Telecom and Backplane Current Measurement
  • Automotive (12V, 24V, or 42V Batteries)
  • Avalanche Photodiode and PIN-Diode Current Monitoring
  • Bidirectional Motor Control
  • General System/Board-Level Current Sensing
  • Power-Management Systems
  • Precision High-Voltage Current Sources
MAX4080EVKIT
Evaluation Kit for the MAX4080 and MAX4081

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