MAX4377FAUA

Product Overview

• Category: Integrated Circuit (IC)
• Use: Current Sense Amplifier
• Characteristics:
  • High precision current sensing
  • Wide input voltage range
  • Low offset voltage and low quiescent current
  • Small package size
• Package: µMAX® (8-pin microMAX)
• Essence: The MAX4377FAUA is a high-precision current sense amplifier designed for accurate measurement of small currents in various applications.
• Packaging/Quantity: Available in tape and reel packaging, with 2500 units per reel.

Specifications

• Supply Voltage Range: 2.7V to 5.5V
• Input Common Mode Voltage Range: -0.1V to +28V
• Quiescent Current: 60µA (typical)
• Gain Bandwidth Product: 500kHz (typical)
• Offset Voltage: 50µV (maximum)
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The MAX4377FAUA has the following pin configuration:

```

---

| | --| IN+ OUT |-- Pin 1: IN+ (Non-Inverting Input) --| IN- GND |-- Pin 2: IN- (Inverting Input) / GND --| REF VCC |-- Pin 3: REF (Reference Voltage Input) / VCC (Supply Voltage) --| SET NC |-- Pin 4: SET (Gain Setting Input) / Not Connected (NC) --| NC NC |-- Pin 5: Not Connected (NC) --| NC NC |-- Pin 6: Not Connected (NC) --| NC NC |-- Pin 7: Not Connected (NC) --| NC OUT |-- Pin 8: OUT (Amplifier Output) |___________| ```

Functional Features

• High Accuracy: The MAX4377FAUA provides precise current sensing with low offset voltage and high gain accuracy.
• Wide Input Voltage Range: It can handle a wide range of input voltages, making it suitable for various applications.
• Low Quiescent Current: The amplifier consumes minimal current when not actively amplifying the signal, resulting in power efficiency.
• Small Package Size: The µMAX package allows for compact designs and space-saving on PCBs.

Advantages and Disadvantages

Advantages: - High precision current sensing - Wide input voltage range - Low offset voltage and low quiescent current - Compact package size

Disadvantages: - Limited gain bandwidth product compared to some other models - Not suitable for high-frequency applications

Working Principles

The MAX4377FAUA is based on a differential amplifier configuration. It amplifies the voltage difference between the IN+ and IN- inputs, which corresponds to the sensed current. The gain can be set using the SET pin, allowing flexibility in different applications. The amplified output is available at the OUT pin.

Detailed Application Field Plans

The MAX4377FAUA is commonly used in various applications that require accurate current sensing, such as:

1. Battery Management Systems: Monitoring and controlling battery charging/discharging currents.
2. Power Supplies: Precise current monitoring in DC-DC converters and linear regulators.
3. Motor Control: Monitoring motor currents for protection and control purposes.
4. Industrial Automation: Current sensing in process control systems and equipment.
5. Automotive Electronics: Current measurement in automotive circuits, including lighting, HVAC, and powertrain systems.

Detailed and Complete Alternative Models

1. INA219: High-side current sense amplifier with I2C interface.
2. LT6106: Precision current sense amplifier with adjustable gain.
3. AD8211: High common-mode voltage current shunt monitor.

These alternative models offer similar functionality and can be considered as alternatives to the MAX4377FAUA in specific applications.

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