Top

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

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

Product Details

The MAX4080/MAX4081 are high-side, current-sense amplifiers with an input voltage range that extends from 4.5V to 76V making them ideal for telecom, automotive, backplane, and other systems where high-voltage current monitoring is critical. The MAX4080 is designed for unidirectional current-sense applications and the MAX4081 allows bidirectional current sensing. The MAX4081 single output pin continuously monitors the transition from charge to discharge and avoids the need for a separate polarity output. The MAX4081 requires an external reference to set the zero-current output level (VSENSE = 0V). The charging current is represented by an output voltage from VREF to VCC, while discharge current is given from VREF to GND.

For maximum versatility, the 76V input voltage range applies independently to both supply voltage (VCC) and common-mode input voltage (VRS+). 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.

The combination of three gain versions (5V/V, 20V/V, 60V/V = F, T, S suffix) and a user-selectable, external sense resistor sets the full-scale current reading and its proportional output voltage. The MAX4080/MAX4081 offer a high level of integration, resulting in a simple, accurate, and compact current-sense solution.

The MAX4080/MAX4081 operate from a 4.5V to 76V single supply and draw only 75µA of supply current. These devices are specified over the automotive operating temperature range (-40°C to +125°C) and are available in a space-saving 8-pin µMAX® or SO package.

Key Features

  • 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

Applications/Uses

  • 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
Parametric specs for Current Sense Amplifiers
VSENSE_FS (mV) (recomm.) 100
250
1000
VOS @25°C (µV) (max) 600
Output Format Voltage
CMVR (V) (min) 4.5
CMVR (V) (max) 76
VCC (V) (min) 4.5
VCC (V) (max) 76
ICC (µA) (typ) 75
Bi-Dir. Curr. Sense No
Gain 20 V/V
5 V/V
60 V/V
Gain Accuracy @25°C (%) (max) 0.6
Oper. Temp. (°C) -40 to +125
Package/Pins SOIC (N)/8
UMAX/8
Budgetary
Price (See Notes)
$1.26 @1k
View More

Simplified Block Diagram

MAX4080, MAX4081: Typical Operating Circuit MAX4080, MAX4081: Typical Operating Circuit Zoom icon

Design & Development

Click any title below to view the detail page where available.

Description

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.

View Details

Features

  • 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

/en/design/design-tools/ee-sim.html?

SIMULATION MODELS

MAX4081TSTR Test Circuit File

Download

SIMULATION MODELS

MAX4081TLTR Test Circuit File

Download

SIMULATION MODELS

MAX4081SSTR Test Circuit File

Download

SIMULATION MODELS

MAX4081TGBW Test Circuit File

Download

SIMULATION MODELS

MAX4081SGBW Test Circuit File

Download

SIMULATION MODELS

MAX4080TLTR Test Circuit File

Download

SIMULATION MODELS

MAX4080TSTR Test Circuit File

Download

SIMULATION MODELS

MAX4081FGBW Test Circuit File

Download

SIMULATION MODELS

MAX4194STR Test Circuit File

Download

SIMULATION MODELS

MAX4080S Orcad Library

Download

SIMULATION MODELS

MAX4080FLTR Test Circuit File

Download

SIMULATION MODELS

MAX4080SSTR Test Circuit File

Download

SIMULATION MODELS

MAX4081S Orcad Library

Download

SIMULATION MODELS

MAX4080SGBW Test Circuit File

Download

SIMULATION MODELS

MAX4081TSTR Test Circuit File

Download

SIMULATION MODELS

MAX4081FSTR Test Circuit File

Download

SIMULATION MODELS

MAX4080S Macromodel

Download

SIMULATION MODELS

MAX4081SLTR Test Circuit File

Download

SIMULATION MODELS

MAX4081SGBW Test Circuit File

Download

SIMULATION MODELS

MAX4080SGBW Test Circuit File

Download

SIMULATION MODELS

MAX4081FLTR Test Circuit File

Download

SIMULATION MODELS

MAX4080F Macromodel

Download

SIMULATION MODELS

MAX4081SSTR Test Circuit File

Download

SIMULATION MODELS

MAX4081FSTR Test Circuit File

Download

SIMULATION MODELS

MAX4080TSTR Test Circuit File

Download

SIMULATION MODELS

MAX4080SLTR Test Circuit File

Download

SIMULATION MODELS

MAX4080FSTR Test Circuit File

Download

SIMULATION MODELS

MAX4080FGBW Test Circuit File

Download

SIMULATION MODELS

MAX4080T Macromodel

Download

SIMULATION MODELS

MAX4080T Orcad Library

Download

SIMULATION MODELS

MAX4081TGBW Test Circuit File

Download

SIMULATION MODELS

MAX4080TLTR Test Circuit File

Download

SIMULATION MODELS

MAX4080SLTR Test Circuit File

Download

SIMULATION MODELS

MAX4081FGBW Test Circuit File

Download

SIMULATION MODELS

MAX4081F Orcad Library

Download

SIMULATION MODELS

MAX4080FLTR Test Circuit File

Download

SIMULATION MODELS

MAX4080FSTR Test Circuit File

Download

SIMULATION MODELS

MAX4080TGBW Test Circuit File

Download

SIMULATION MODELS

MAX4081TLTR Test Circuit File

Download

SIMULATION MODELS

MAX4080TGBW Test Circuit File

Download

SIMULATION MODELS

MAX4080SSTR Test Circuit File

Download

SIMULATION MODELS

MAX4081T Orcad Library

Download

SIMULATION MODELS

MAX4080FGBW Test Circuit File

Download

SIMULATION MODELS

MAX4081FLTR Test Circuit File

Download

SIMULATION MODELS

MAX4081SLTR Test Circuit File

Download

SIMULATION MODELS

MAX4080F Orcad Library

Download

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal

Parameters

Key Features

  • 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

Applications/Uses

  • 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

Description

The MAX4080/MAX4081 are high-side, current-sense amplifiers with an input voltage range that extends from 4.5V to 76V making them ideal for telecom, automotive, backplane, and other systems where high-voltage current monitoring is critical. The MAX4080 is designed for unidirectional current-sense applications and the MAX4081 allows bidirectional current sensing. The MAX4081 single output pin continuously monitors the transition from charge to discharge and avoids the need for a separate polarity output. The MAX4081 requires an external reference to set the zero-current output level (VSENSE = 0V). The charging current is represented by an output voltage from VREF to VCC, while discharge current is given from VREF to GND.

For maximum versatility, the 76V input voltage range applies independently to both supply voltage (VCC) and common-mode input voltage (VRS+). 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.

The combination of three gain versions (5V/V, 20V/V, 60V/V = F, T, S suffix) and a user-selectable, external sense resistor sets the full-scale current reading and its proportional output voltage. The MAX4080/MAX4081 offer a high level of integration, resulting in a simple, accurate, and compact current-sense solution.

The MAX4080/MAX4081 operate from a 4.5V to 76V single supply and draw only 75µA of supply current. These devices are specified over the automotive operating temperature range (-40°C to +125°C) and are available in a space-saving 8-pin µMAX® or SO package.

Simplified Block Diagram

MAX4080, MAX4081: Typical Operating Circuit MAX4080, MAX4081: Typical Operating Circuit Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal