The NXP LM431 is a versatile, precision Zener shunt regulator that offers an adjustable output voltage. This precision device is designed for use in a wide array of applications ranging from power supplies to voltage reference in combination with operational amplifiers. The LM431 is well-suited for both consumer electronics and industrial applications due to its stability, reliability, and flexibility.

Key Features

• Adjustable Output Voltage: The output voltage can be set to any value from 2.5 V to 36 V with two external resistors. This feature provides designers with the flexibility to tailor the output voltage to their specific needs.
• Low Dynamic Output Impedance: The dynamic output impedance of the LM431 is typically 0.2 ohms, a characteristic that ensures stable voltage regulation against load variations.
• Temperature Compensated: For applications requiring a stable voltage reference over a wide temperature range, the LM431 is temperature compensated, ensuring minimal drift.
• High Precision: The device boasts a precision of typically 0.5% at 25°C, making it an ideal choice for applications that demand high accuracy.

Applications

The NXP LM431's adjustable nature and precision make it suitable for a diverse set of applications, including:

• Power supplies
• Battery chargers
• Voltage monitoring
• Adjustable voltage references
• Switching power supplies

Package Options and Specifications

The LM431 is available in several package options, including the small-outline transistor (SOT-23) and the TO-92, providing flexibility in design for space-constrained applications. The operating temperature range for the LM431 is from -40°C to +85°C, which allows for use in a wide range of environmental conditions. The device also features a typical response time of 100 ns for fast turn-on, which is beneficial in applications where quick response to changes in load or input voltage is required.

For detailed specifications, application circuits, and additional information, designers are encouraged to consult the NXP LM431 datasheet, which offers comprehensive guidance for integrating this regulator into their designs.