The SPX431BM1-L-TR is a precision adjustable shunt regulator manufactured by Exar Corporation. It's designed to function as a low-voltage adjustable reference and is commonly used in various electronic circuits for voltage regulation, voltage monitoring, and error amplification. The device offers high accuracy and stability, making it suitable for demanding applications where precise voltage control is crucial.

Applications

• Switching Power Supplies: Used as a voltage reference in the feedback loop to regulate the output voltage.
• Linear Regulators: Provides a stable reference voltage for linear regulators to maintain a consistent output.
• Voltage Monitors: Implemented in circuits to monitor voltage levels and trigger alerts or protection mechanisms when voltage deviates from the desired range.
• Error Amplifiers: Functions as an error amplifier in control systems to minimize the difference between the actual output and the desired setpoint.
• Instrumentation: Utilized in precision measurement instruments for accurate voltage referencing.

Features

• Adjustable Output Voltage: The output voltage can be adjusted from Vref (2.5V) to 36V with two external resistors.
• Low Temperature Coefficient: Ensures stable performance over a wide temperature range.
• High Accuracy: Offers a tight initial tolerance on the reference voltage.
• Low Output Noise: Minimizes noise in the regulated voltage output.
• Low Dynamic Output Impedance: Provides good load regulation.
• Sink Current Capability: Operates with a wide range of cathode current.

Benefits

• Precise Voltage Regulation: Enables accurate and reliable voltage control in electronic circuits.
• Stable Performance: Maintains consistent performance across temperature variations and load changes.
• Versatile Application: Can be used in a wide variety of voltage regulation and monitoring applications.
• Simplified Circuit Design: Reduces component count and simplifies circuit design.
• Cost-Effective Solution: Offers a high-performance voltage reference at a competitive price.

Additional Details

The SPX431BM1-L-TR is typically available in a SOT-23 package. The reference voltage is internally set to 2.5V. The operating temperature range is usually from -40°C to +125°C, making it suitable for industrial applications. The device requires minimal external components for operation, typically just two resistors to set the output voltage. It is a three terminal shunt regulator.