Product Overview: Texas Instruments LM431BIM Adjustable Precision Zener Shunt Regulator

The LM431BIM is a versatile, precision Zener shunt regulator from the reputable manufacturer Texas Instruments. This device is designed to provide an adjustable output voltage that can be set to any value between V_REF (approximately 2.5 volts) and 36 volts with two external resistors. The LM431BIM is widely used in a variety of applications, including adjustable voltage and current regulators, switching power supplies, and as a precision current limiter.

With its three-terminal adjustable shunt regulator configuration, the LM431BIM offers excellent temperature stability and output current handling capability up to 100mA. The reference voltage (V_REF) is ensured to ±0.5% accuracy for B-grade devices at 25°C, and ±1% accuracy over the full operating temperature range from -40°C to +85°C. This level of precision is ideal for critical applications where voltage regulation is paramount.

Key Features:

• Adjustable Output Voltage: Any value between 2.5V and 36V can be achieved with the use of two external resistors.
• High Precision: Reference voltage accuracy is ±0.5% (B-grade) at 25°C.
• Low Dynamic Output Impedance: The dynamic output impedance of the LM431BIM is typically 0.22 ohms, making it a stable and reliable regulator.
• Wide Operating Temperature Range: The device is functional over a broad temperature range from -40°C to +85°C, suitable for various environmental conditions.
• Surface-Mount Package: The LM431BIM comes in an SOIC-8 package, which is ideal for space-constrained applications.

The LM431BIM shunt regulator's performance is enhanced by its fast turn-on response and its ability to operate with up to 100mA of sinking current without the need for an external transistor. This makes it an excellent choice for power supply tracking error amplifier applications and voltage monitoring.

Whether you're designing a new power supply or looking to improve an existing one, the Texas Instruments LM431BIM offers the flexibility, reliability, and precision needed for high-performance voltage regulation solutions.