L7809CD2T-TR

Product Overview

Category

L7809CD2T-TR belongs to the category of voltage regulators.

Use

It is commonly used to regulate and stabilize the output voltage in electronic circuits.

Characteristics

• Input Voltage Range: 11V to 35V
• Output Voltage: 9V
• Maximum Output Current: 1.5A
• Dropout Voltage: 2V
• Operating Temperature Range: -40°C to +125°C
• Package Type: D2PAK (TO-263)
• Mounting Style: Surface Mount
• RoHS Compliant: Yes

Packaging/Quantity

The L7809CD2T-TR is typically packaged in reels or tubes, containing a quantity of 250 units per package.

Specifications

• Input Voltage Range: 11V to 35V
• Output Voltage: 9V
• Output Current: Up to 1.5A
• Dropout Voltage: 2V
• Line Regulation: ±0.2%
• Load Regulation: ±0.4%
• Ripple Rejection Ratio: 62dB
• Quiescent Current: 6mA
• Thermal Shutdown Protection: Yes
• Short Circuit Protection: Yes

Pin Configuration

The L7809CD2T-TR has three pins:

1. Input (VIN): This pin is connected to the input voltage source.
2. Ground (GND): This pin is connected to the ground reference.
3. Output (VOUT): This pin provides the regulated output voltage.

Functional Features

• Voltage Regulation: The L7809CD2T-TR ensures a stable and constant output voltage of 9V, regardless of variations in the input voltage or load conditions.
• Overcurrent Protection: It incorporates short circuit protection, preventing damage to the regulator and the connected circuitry in case of a short circuit.
• Thermal Shutdown Protection: The device includes a thermal shutdown feature that activates when the temperature exceeds a safe operating limit, protecting it from overheating.

Advantages and Disadvantages

Advantages

• Wide input voltage range allows for flexibility in various applications.
• High output current capability of up to 1.5A.
• Excellent line and load regulation ensures stable performance.
• Built-in protection features safeguard against overcurrent and thermal issues.

Disadvantages

• Dropout voltage of 2V may result in higher power dissipation and reduced efficiency in low input voltage scenarios.
• Surface mount package may require specialized equipment for soldering and rework.

Working Principles

The L7809CD2T-TR is a linear voltage regulator based on the fixed positive voltage regulator IC design. It utilizes a series pass transistor to regulate the output voltage. When the input voltage exceeds the desired output voltage, the excess voltage is dropped across the pass transistor, ensuring a constant output voltage. The internal circuitry monitors the output voltage and adjusts the pass transistor accordingly to maintain the desired voltage level.

Detailed Application Field Plans

The L7809CD2T-TR finds application in various electronic systems where a stable 9V power supply is required. Some common application fields include:

1. Power Supply Units (PSUs): It can be used in PSUs to provide regulated 9V DC power for microcontrollers, sensors, and other components.
2. Industrial Control Systems: The regulator can be employed in industrial control systems to ensure a consistent voltage supply for analog and digital circuits.
3. Automotive Electronics: It can be utilized in automotive electronics to power various modules and subsystems requiring a 9V input.
4. Audio Amplifiers: The L7809CD2T-TR can be integrated into audio amplifier circuits to provide a reliable power source for audio processing and amplification stages.

Detailed and Complete Alternative Models

1. LM7809: This is a popular alternative model from Texas Instruments with similar specifications and pin configuration.
2. MC7809: Manufactured by ON Semiconductor, this model offers comparable performance and compatibility with the L7809CD2T-TR.
3. UA7809: Produced by Fairchild Semiconductor, this alternative model provides a reliable 9V voltage regulation solution.

These alternative models can be considered based on availability, pricing, and specific application requirements.

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