The UTCTL431NS is a precision adjustable shunt regulator manufactured by UTC (Unisonic Technologies Co., Ltd.). It functions as a programmable voltage reference, offering high accuracy and stability over a wide range of operating conditions.

Applications

• Voltage monitoring
• Precision current sources
• Over-voltage protection circuits
• Adjustable power supplies
• Error amplifiers in switching regulators
• Linear regulators

Features

• Programmable output voltage
• Low dynamic output impedance
• Sink current capability from 1mA to 100mA
• Equivalent full-range temperature coefficient typically 50 ppm/°C
• Low output noise
• Precision reference voltage

Benefits

• Precise and stable voltage regulation
• Flexibility in voltage setting via external resistors
• High accuracy in voltage monitoring and control
• Reduced component count compared to discrete solutions
• Improved system performance and reliability

Additional Details

The UTCTL431NS operates by comparing its internal reference voltage to the voltage at the reference pin. An external resistor divider network is typically used to set the desired output voltage. When the voltage at the reference pin is below the internal reference, the device turns on, sinking current from the cathode to the anode. This action regulates the voltage to the desired level. The low dynamic output impedance ensures stable operation even with varying load currents.

The UTCTL431NS is commonly available in various packages, such as SOT-23, TO-92, and SOIC. Its small size and ease of use make it ideal for a wide range of applications requiring precise voltage regulation or monitoring. Its ability to sink current from 1mA to 100mA provides flexibility in circuit design. It's often used in feedback control loops in power supplies to maintain a stable output voltage despite variations in input voltage or load current.