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MAX4080SASA+ from N/A

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MAX4080SASA+

Manufacturer: N/A, MAXIM

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

Partnumber Manufacturer Quantity Availability
MAX4080SASA+ N/A, MAXIM 2555 In Stock

Description and Introduction

76V, High-Side, Current-Sense Amplifiers with Voltage Output The MAX4080SASA+ is a high-side current-sense amplifier manufactured by **MAXIM Integrated** (now part of Analog Devices).  

### **Specifications:**  
- **Supply Voltage Range:** 4.5V to 76V  
- **Input Common-Mode Voltage Range:** 4.5V to 76V  
- **Gain Options:** 20V/V, 50V/V, 100V/V  
- **Accuracy:** ±1% (max) gain error  
- **Bandwidth:** 250kHz (typical)  
- **Quiescent Current:** 60µA (typical)  
- **Operating Temperature Range:** -40°C to +125°C  
- **Package:** 8-pin SOIC  

### **Descriptions and Features:**  
- **High-Side Current Sensing:** Monitors current without disrupting the ground path.  
- **Wide Input Voltage Range:** Supports high-voltage applications (up to 76V).  
- **Low Offset Voltage:** Ensures accurate current measurement.  
- **Low-Power Operation:** Suitable for battery-powered systems.  
- **Fixed Gain Options:** Eliminates the need for external gain-setting resistors.  
- **Reverse Battery Protection:** Withstands -16V on the supply pin.  
- **Integrated Current-Sense Resistor:** Simplifies design by reducing external components.  

The MAX4080SASA+ is commonly used in **automotive, industrial, and power management systems** for precise current monitoring.

Application Scenarios & Design Considerations

76V, High-Side, Current-Sense Amplifiers with Voltage Output# Technical Documentation: MAX4080SASA High-Side Current-Sense Amplifier

## 1. Application Scenarios

### 1.1 Typical Use Cases
The MAX4080SASA is a high-side current-sense amplifier designed for precision current monitoring in applications where direct ground-referenced measurements are impractical. Typical use cases include:

-  Battery Management Systems : Monitoring charge/discharge currents in portable electronics, power tools, and electric vehicles
-  Power Supply Monitoring : Overcurrent protection and load monitoring in DC/DC converters and voltage regulators
-  Motor Control Systems : Current feedback for brushless DC (BLDC) motors and servo drives
-  Telecommunications Equipment : Current monitoring in base station power amplifiers and line cards
-  Automotive Electronics : Monitoring currents in engine control units, lighting systems, and infotainment systems

### 1.2 Industry Applications

####  Consumer Electronics 
- Smartphone and tablet battery management
- Laptop power adapters and charging circuits
- Gaming console power monitoring

####  Industrial Automation 
- PLC I/O module current sensing
- Robotics actuator current monitoring
- Industrial motor drives

####  Renewable Energy 
- Solar panel string current monitoring
- Wind turbine generator current sensing
- Energy storage system management

####  Medical Equipment 
- Portable medical device battery monitoring
- Diagnostic equipment power management
- Patient monitoring systems

### 1.3 Practical Advantages and Limitations

####  Advantages: 
-  High-Side Sensing : Enables current monitoring without interrupting the ground path
-  Wide Common-Mode Range : Operates from 4.5V to 76V, suitable for various power systems
-  Low Offset Voltage : ±500µV maximum ensures accurate low-current measurements
-  Integrated Gain Resistors : Fixed gain options (20V/V, 60V/V, 100V/V) provide stable performance
-  Small Package : 8-pin SOIC package saves board space
-  Low Power Consumption : 650µA typical supply current

####  Limitations: 
-  Fixed Gain Options : Limited to specific gain values (no adjustable gain version)
-  Bandwidth Constraints : 250kHz bandwidth may be insufficient for high-frequency switching applications
-  Temperature Range : Industrial temperature range (-40°C to +125°C) may not suit extreme environments
-  No Integrated Shunt : Requires external current-sense resistor

## 2. Design Considerations

### 2.1 Common Design Pitfalls and Solutions

####  Pitfall 1: Improper Sense Resistor Selection 
-  Problem : Using resistors with inadequate power rating or poor temperature coefficient
-  Solution : Select sense resistors with appropriate wattage (consider I²R losses) and low TCR (<50ppm/°C)

####  Pitfall 2: Inadequate Bypassing 
-  Problem : Power supply noise affecting measurement accuracy
-  Solution : Place 0.1µF ceramic capacitor close to VCC pin and 1µF bulk capacitor nearby

####  Pitfall 3: PCB Thermal Issues 
-  Problem : Self-heating of sense resistor causing measurement drift
-  Solution : Use Kelvin connections and adequate copper pour for heat dissipation

####  Pitfall 4: Input Filtering Mistakes 
-  Problem : Incorrect RC filtering affecting bandwidth and phase margin
-  Solution : Keep filter capacitors small (<1nF) and calculate cutoff frequency considering amplifier bandwidth

### 2.2 Compatibility Issues with Other Components

####  Microcontroller Interfaces 
-  ADC Compatibility : Ensure output voltage range matches ADC input requirements
-  Reference Voltage : The MAX4080SASA requires external reference; ensure stability and accuracy
-  Sampling Rate : Match amplifier bandwidth to ADC sampling requirements

####  Power Supply Considerations 
-  Voltage Domains :

Alternative Part Number

  • INA199A1DCKR --: High-side current-sense amplifier with similar gain and function, available in small SC70 package, widely stocked and cost-effective.
  • AD8210YRZ --: High-side current shunt amplifier with comparable common-mode range and accuracy, suitable drop-in for many current-sense designs.
  • LT6105IMS8 --: Precision high-side current-sense amplifier with wide input common-mode range, good alternative when higher accuracy is needed.
  • AD8418AWBRZ --: Bidirectional high-side current-sense amplifier offering comparable common-mode range and accuracy for current monitoring applications.
  • LT6105IMS8#PBF --: High-side current-sense amplifier with wide input common-mode range and adjustable gain, suitable as an alternative in current-sensing designs.

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