LM431BIZX

Product Overview

Category: Integrated Circuits (ICs)

Use: Voltage References

Characteristics: - Adjustable Precision Shunt Regulator - Low Output Noise - High Accuracy - Wide Operating Voltage Range - Low Temperature Drift - Programmable Output Voltage

Package: TO-92, SOT-23, SOIC-8

Essence: The LM431BIZX is a precision shunt regulator that can be used to provide a stable reference voltage. It is commonly used in various electronic circuits where a precise voltage reference is required.

Packaging/Quantity: The LM431BIZX is available in different package options such as TO-92, SOT-23, and SOIC-8. The quantity per package may vary depending on the manufacturer.

Specifications

• Reference Voltage Range: 2.495V to 36V
• Initial Tolerance: ±0.5%
• Temperature Coefficient: 50ppm/°C
• Cathode Current Range: 1mA to 100mA
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The LM431BIZX 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 stable reference voltage.

Functional Features

• Adjustable Output Voltage: The LM431BIZX allows for adjustable output voltage by connecting external resistors.
• Precision Voltage Reference: It provides a highly accurate and stable reference voltage.
• Shunt Regulation: The LM431BIZX operates as a shunt regulator, maintaining a constant voltage drop across the device.
• Low Output Noise: It produces minimal noise, making it suitable for applications requiring low noise levels.
• Wide Operating Voltage Range: The LM431BIZX can operate within a wide voltage range, making it versatile for various applications.

Advantages and Disadvantages

Advantages: - High accuracy and stability - Adjustable output voltage - Low temperature drift - Wide operating voltage range - Low output noise

Disadvantages: - Limited maximum cathode current (100mA) - Requires external resistors for adjustable output voltage

Working Principles

The LM431BIZX works by comparing the reference voltage at the Reference (R) pin with an adjustable voltage divider connected to the Anode (A) and Cathode (K) pins. By adjusting the voltage divider, the desired output voltage can be set. The LM431BIZX then regulates the voltage drop across itself to maintain a stable output voltage.

Detailed Application Field Plans

The LM431BIZX finds applications in various fields, including:

1. Voltage Regulation: It is commonly used as a precision voltage reference in power supplies, battery chargers, and voltage regulators.
2. Feedback Control: It can be used in feedback control circuits to provide accurate voltage references for operational amplifiers, analog-to-digital converters, and other analog circuits.
3. Temperature Compensation: The LM431BIZX's low temperature coefficient makes it suitable for temperature compensation circuits in sensors and temperature-sensitive devices.
4. LED Drivers: It can be used as a current regulator in LED drivers to maintain a constant current flow through the LEDs.

Detailed and Complete Alternative Models

Some alternative models to the LM431BIZX include:

1. TL431: Similar functionality and specifications, available in different package options.
2. LM4040: Precision shunt voltage reference with fixed output voltages.
3. LT1236: Precision shunt voltage reference with ultra-low temperature drift.

These alternative models offer similar features and can be used as substitutes depending on specific requirements.

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