LM431AIZ

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 - High Accuracy and Stability

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

Essence: The LM431AIZ 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 LM431AIZ 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: 2.5V to 36V
• Operating Current Range: 1mA to 100mA
• Temperature Range: -40°C to +85°C
• Line Regulation: 0.2%/V
• Load Regulation: 0.4%/mA
• Initial Tolerance: ±0.5%
• Maximum Cathode Current: 150mA

Detailed Pin Configuration

The LM431AIZ has three pins:

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

Functional Features

• Adjustable Output Voltage: The LM431AIZ allows for precise adjustment of the output voltage by using external resistors.
• Low Dynamic Output Impedance: Ensures stability and accuracy of the output voltage even with varying load conditions.
• Wide Operating Current Range: Can operate within a wide range of current levels, making it suitable for various applications.
• High Accuracy and Stability: Provides a highly accurate and stable reference voltage over temperature and load variations.

Advantages and Disadvantages

Advantages: - Precise voltage regulation - Wide operating current range - High accuracy and stability - Adjustable output voltage

Disadvantages: - Limited maximum cathode current (150mA) - Requires external resistors for voltage adjustment

Working Principles

The LM431AIZ works as a shunt regulator, maintaining a constant voltage across the reference pin (R) with respect to the cathode pin (K). By adjusting the resistance connected between the anode pin (A) and the cathode pin (K), the output voltage can be precisely set. The internal circuitry of the LM431AIZ ensures that the regulated voltage remains stable even with varying load conditions.

Detailed Application Field Plans

The LM431AIZ finds applications in various fields, including:

1. Power Supply Regulation: It can be used as a voltage reference in power supply circuits to ensure stable and accurate output voltages.
2. Battery Charging Systems: The LM431AIZ can be employed in battery charging circuits to provide precise voltage references for optimal charging.
3. Audio Amplifiers: It is used in audio amplifier circuits to maintain a stable bias voltage for improved audio performance.
4. Instrumentation: The LM431AIZ is utilized in precision measurement instruments where accurate voltage references are crucial.

Detailed and Complete Alternative Models

Some alternative models to the LM431AIZ include:

1. TL431: Similar functionality and specifications, available in different package options.
2. LM4040: Precision shunt voltage reference with fixed output voltage options.
3. LT1009: Precision reference voltage source with adjustable output voltage.

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

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