L78L05ACD

Product Overview

• Category: Linear Voltage Regulator
• Use: Voltage regulation in electronic circuits
• Characteristics: Low dropout voltage, fixed output voltage of 5V, small package size
• Package: TO-252 (DPAK)
• Essence: Integrated circuit for regulating voltage
• Packaging/Quantity: Tape and reel packaging, 2,500 units per reel

Specifications

• Input Voltage Range: Up to 35V
• Output Voltage: 5V
• Output Current: Up to 100mA
• Dropout Voltage: 2V (typical)
• Quiescent Current: 4.5mA (typical)
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The L78L05ACD has three pins:

1. Input (VIN): Connects to the input voltage source.
2. Ground (GND): Connected to the ground reference.
3. Output (VOUT): Provides the regulated output voltage.

Functional Features

• Voltage Regulation: The L78L05ACD maintains a constant output voltage of 5V, regardless of changes in the input voltage or load conditions.
• Low Dropout Voltage: With a dropout voltage of only 2V, the regulator can operate efficiently even when the input voltage is close to the desired output voltage.
• Short Circuit Protection: The device includes internal current limiting and thermal shutdown protection to prevent damage in case of a short circuit or excessive temperature.

Advantages and Disadvantages

Advantages: - Simple and easy to use. - Compact package size allows for space-saving designs. - Low dropout voltage enables efficient operation.

Disadvantages: - Limited output current capability (up to 100mA). - Not suitable for high-power applications.

Working Principles

The L78L05ACD is a linear voltage regulator that uses a series pass transistor to regulate the output voltage. It compares the output voltage with a reference voltage and adjusts the pass transistor accordingly to maintain a constant output voltage of 5V. The regulator operates in a continuous mode, continuously adjusting the pass transistor to compensate for changes in input voltage or load conditions.

Detailed Application Field Plans

The L78L05ACD is commonly used in various electronic circuits where a stable 5V power supply is required. Some typical application fields include:

1. Microcontrollers: Providing a regulated power source for microcontroller-based systems.
2. Digital Logic Circuits: Supplying a stable voltage to digital logic ICs.
3. Sensor Modules: Powering sensor modules that require a precise and stable voltage reference.
4. Battery-Powered Devices: Regulating the voltage in battery-powered devices to ensure consistent performance.

Detailed and Complete Alternative Models

1. LM7805: A popular alternative from Texas Instruments with similar specifications and pin configuration.
2. MC78L05: An alternative from ON Semiconductor offering comparable performance and compatibility.
3. UA78L05: Another alternative from Texas Instruments known for its reliability and low cost.

These alternatives can be considered based on specific requirements and availability.

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