The SC431LCK is a precision adjustable shunt regulator from Semtech Corporation, designed to provide stable and accurate voltage regulation. It functions as a three-terminal adjustable shunt regulator, making it a viable alternative to Zener diodes in numerous applications. Key features include adjustable output voltage, low dynamic output impedance, and excellent temperature stability, ensuring reliable performance across varying operating conditions.

Applications:

• Precision Voltage References
• Linear Regulators
• Switching Power Supplies
• Adjustable Power Supplies
• Voltage Monitoring
• Error Amplifiers in Power Supplies

Features:

• Adjustable Output Voltage: Vref to 36V
• Low Dynamic Output Impedance: Typically 0.2Ω
• Sink Current Capability: 1mA to 100mA
• Low Temperature Coefficient
• Off-State Current: Typically 100nA
• Excellent Temperature Stability
• Sharp Turn-On Characteristics
• Available in various package options

Benefits:

• Offers a stable and accurate voltage reference for precision regulation.
• Simplifies circuit design and reduces component count due to its adjustable output voltage.
• Provides flexibility in voltage selection, catering to diverse application needs.
• Enhances circuit performance and reliability through its excellent temperature stability.
• Serves as a cost-effective replacement for Zener diodes, often improving overall performance.

Additional Details:

The SC431LCK is typically utilized in applications that demand a stable voltage reference or an accurate error amplifier. The output voltage is adjustable by implementing two external resistors. The device's low dynamic output impedance ensures stable operation in regulation circuits. It operates with a reference voltage around 2.5V. The maximum cathode voltage is 36V, and it can handle sink currents ranging from 1mA to 100mA. These specifications make it well-suited for a variety of power management applications where precise and stable voltage regulation is critical.