The ACS709LLFTR-45AB-T is a fully integrated, low noise, Hall effect linear current sensor IC from Allegro MicroSystems. It is designed to provide economical and precise solutions for AC or DC current sensing in industrial, automotive, commercial, and communications systems. The device is packaged in a small, surface-mount footprint, making it ideal for space-constrained applications.

Applications:

• Current sensing in motor control systems
• Load detection and management in power supplies
• Overcurrent fault detection in automotive systems
• Power inverter monitoring in solar energy systems
• White goods current monitoring
• Battery management systems (BMS)

Features:

• Low noise analog signal path
• Small footprint, surface-mount package
• 4.5 V to 5.5 V, single supply operation
• 120 kHz bandwidth
• Output voltage proportional to AC or DC currents
• Factory-trimmed for accuracy
• Ratiometric output from supply voltage

Benefits:

• Provides accurate and reliable current measurements, enhancing system control and performance.
• Simplifies circuit design and reduces board space due to its integrated solution.
• Offers high bandwidth for real-time current monitoring in dynamic applications.
• Enhances system safety by providing overcurrent detection capabilities.
• Reduces overall system cost by minimizing external components.

Additional Details:

The ACS709LLFTR-45AB-T operates with a single 4.5 V to 5.5 V supply. The output voltage is proportional to the applied AC or DC current. The device is factory-trimmed to minimize offset and gain errors, providing high accuracy without the need for external calibration. The typical sensitivity is specified in mV/A. The internal resistance of the current path is low, minimizing power dissipation. The device provides galvanic isolation, enhancing safety and reliability in high-voltage applications. The operating temperature range is -40°C to +125°C. It is fully calibrated to provide a highly accurate current measurement over the operating temperature range. The device is RoHS compliant. It's robust design ensures reliable performance in harsh industrial and automotive environments. Detailed performance characteristics can be found in the Allegro MicroSystems datasheet for the ACS709 family. The output response time is typically very fast allowing for precise control and monitoring of rapidly changing currents.