AN78L09M

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Regulator
• Characteristics: Fixed Output Voltage, Low Dropout Voltage, Small Package Size
• Package: TO-252, TO-220, SOT-89
• Essence: Linear Voltage Regulator
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Input Voltage Range: 10V to 35V
• Output Voltage: +9V
• Output Current: 100mA
• Dropout Voltage: 2V (max)
• Quiescent Current: 5mA (typ)
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The AN78L09M has three pins: 1. Input Pin (IN): Connects to the input voltage source. 2. Ground Pin (GND): Connected to the ground reference. 3. Output Pin (OUT): Provides the regulated output voltage.

Functional Features

• Fixed Output Voltage: The AN78L09M provides a stable output voltage of +9V, regardless of input voltage fluctuations.
• Low Dropout Voltage: With a maximum dropout voltage of 2V, the regulator can maintain a stable output even when the input voltage is close to the desired output voltage.
• Small Package Size: Available in various compact packages such as TO-252, TO-220, and SOT-89, making it suitable for space-constrained applications.
• Thermal Shutdown Protection: The IC incorporates thermal shutdown protection to prevent damage due to excessive heat.

Advantages and Disadvantages

Advantages

• Simple to use: Requires minimal external components for operation.
• Reliable: Provides a stable output voltage under varying load conditions.
• Cost-effective: Offers an affordable solution for voltage regulation needs.
• Wide operating temperature range: Can operate in extreme temperature conditions.

Disadvantages

• Limited output current: The AN78L09M is designed for low-current applications, with a maximum output current of 100mA.
• Fixed output voltage: The regulator only provides a fixed +9V output and cannot be adjusted.

Working Principles

The AN78L09M is a linear voltage regulator that uses a series pass transistor to regulate the output voltage. It operates by comparing the reference voltage with the feedback voltage from a voltage divider network. Any difference between the two voltages is amplified and used to control the pass transistor, ensuring a stable output voltage.

Detailed Application Field Plans

The AN78L09M is commonly used in various electronic devices and applications, including: 1. Power supply circuits for microcontrollers and digital ICs. 2. Battery-powered devices requiring a regulated voltage source. 3. Automotive electronics, such as car audio systems and dashboard displays. 4. Industrial control systems and automation equipment. 5. Consumer electronics, such as portable audio players and small appliances.

Detailed and Complete Alternative Models

Some alternative models to the AN78L09M include: 1. LM7809: A popular linear voltage regulator with similar specifications and pin configuration. 2. MC78L09: Another widely used fixed voltage regulator offering comparable performance. 3. UA78L09: A low-power, fixed voltage regulator suitable for battery-operated applications.

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