LM431BCM/NOPB

Product Overview

Category: Integrated Circuits (ICs)

Use: Voltage References

Characteristics: - Adjustable Precision Shunt Regulator - Programmable Output Voltage - Low Dynamic Output Impedance - Wide Operating Current Range - Low Temperature Coefficient - Fast Turn-On Response - Low Output Noise

Package: SOT-23

Essence: The LM431BCM/NOPB is a precision shunt regulator that can be used as a versatile voltage reference in various applications.

Packaging/Quantity: The LM431BCM/NOPB is available in tape and reel packaging, with 3000 units per reel.

Specifications

• Reference Voltage Range: 2.495V to 36V
• Initial Accuracy: ±0.5%
• Temperature Stability: ±50ppm/°C
• Cathode Current Range: 1mA to 100mA
• Dynamic Output Impedance: 0.2Ω
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The LM431BCM/NOPB has three pins:

1. Anode (A): Connected to the positive supply voltage.
2. Cathode (K): Connected to the load or ground.
3. Reference (R): Provides the regulated output voltage.

Functional Features

• Adjustable Output Voltage: The LM431BCM/NOPB allows for precise adjustment of the output voltage according to the application requirements.
• Precision Shunt Regulation: It provides a stable and accurate reference voltage for use in various electronic circuits.
• Low Output Impedance: The low dynamic output impedance ensures excellent load regulation and stability.
• Wide Operating Current Range: The device can operate within a wide range of cathode currents, making it suitable for different load conditions.
• Fast Turn-On Response: The LM431BCM/NOPB has a fast response time, enabling quick regulation of the output voltage.
• Low Output Noise: It produces minimal noise, ensuring clean and reliable voltage reference.

Advantages

• High precision and accuracy in voltage regulation.
• Wide operating temperature range allows for use in various environmental conditions.
• Adjustable output voltage provides flexibility in different applications.
• Low dynamic output impedance ensures stable performance under varying load conditions.
• Fast turn-on response enables rapid voltage regulation.

Disadvantages

• Limited maximum cathode current may restrict its use in high-power applications.
• SOT-23 package may not be suitable for certain space-constrained designs.

Working Principles

The LM431BCM/NOPB operates as a shunt regulator by comparing the reference voltage at the Reference (R) pin with the voltage across the load connected to the Cathode (K) pin. It adjusts the current flowing through the shunt resistor to maintain a constant voltage drop across it, thereby regulating the output voltage.

Detailed Application Field Plans

The LM431BCM/NOPB can be used in various applications, including but not limited to: 1. Voltage references in precision analog circuits. 2. Voltage regulators in power supplies. 3. Current limiters in battery charging circuits. 4. Error amplifiers in feedback control systems. 5. Temperature sensors and compensation circuits.

Detailed and Complete Alternative Models

Some alternative models to the LM431BCM/NOPB include: - TL431 - LM4040 - LT1009 - REF02

These alternatives offer similar functionality and can be considered based on specific application requirements.

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