Overview
Features and Benefits
- 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
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.
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
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
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MAX4080 Reliability Data1/12/2023PDF41K
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40W Single Port MAX5971A Current Sensing6/21/2016
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Current-Sense Amplifier Doubles as a High-Common Mode Instrumentation Amplifier12/3/2012
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Protect Current-Sense Amplifiers from Negative Overvoltage2/9/2011
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Extend Range of Current-Sense Amplifiers11/29/2010
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Add High Voltage Capability to the MAX471/MAX472 High-Side Current Sense Amplifiers3/14/2003
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Circuit Breaker Handles Voltages to 76V7/28/2000
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NEW
Optocoupler Extends High-Side Current Sensor to 1kV2/15/2023
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DC Error Budget Calculator Simplifies Selection of Optimal Current-Sense Amplifiers4/9/2013
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Improve Current Measurement Accuracy by Skewing the Input Offset Voltage on Current-Sense Amplifiers10/16/2009
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Protect Current-Sense Amplifiers Against Overvoltage Transients4/8/2009
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Creating a Bidirectional Current-Sense Amplifier from Two Unidirectional Current-Sense Amplifiers9/22/2006
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High-Side Current-Sense Measurement: Circuits and Principles11/19/2001
Design Resources
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.