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

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

Product Details

Key Features

Applications/Uses

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
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Simplified Block Diagram

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Parameters

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

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 .