L78L09ACUTR

Product Overview

• Category: Voltage Regulator
• Use: To regulate and stabilize the output voltage in electronic circuits
• Characteristics:
  • Low dropout voltage
  • High output current capability
  • Thermal overload protection
  • Short-circuit protection
• Package: SOT-89
• Essence: Linear voltage regulator
• Packaging/Quantity: Tape and reel, 2500 units per reel

Specifications

• Input Voltage: Up to 35V
• Output Voltage: 9V
• Output Current: Up to 100mA
• Dropout Voltage: 1.7V (typical)
• Quiescent Current: 4.5mA (typical)
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The L78L09ACUTR has three pins:

1. Input (IN): Connects to the input voltage source.
2. Ground (GND): Connected to the ground reference of the circuit.
3. Output (OUT): Provides the regulated output voltage.

Functional Features

• Voltage Regulation: The L78L09ACUTR maintains a constant output voltage of 9V, regardless of changes in the input voltage or load conditions.
• Low Dropout Voltage: The regulator can operate with a very small voltage difference between the input and output, minimizing power dissipation.
• High Output Current Capability: It can deliver up to 100mA of continuous output current.
• Thermal Overload Protection: The device includes internal thermal shutdown circuitry to prevent damage due to excessive temperature.
• Short-Circuit Protection: The regulator is designed to withstand short-circuits between the output and ground without being damaged.

Advantages and Disadvantages

Advantages: - Simple to use and integrate into electronic circuits - Provides stable and regulated output voltage - Offers protection against thermal overload and short-circuits - Suitable for low-power applications

Disadvantages: - Limited output current capability compared to higher-rated regulators - Dropout voltage may affect efficiency in certain applications

Working Principles

The L78L09ACUTR is a linear voltage regulator that uses a series pass transistor to regulate the output voltage. It compares the reference voltage with the feedback voltage and adjusts the pass transistor accordingly to maintain a constant output voltage.

When the input voltage exceeds the desired output voltage, the excess voltage is dropped across the pass transistor, resulting in a lower output voltage. Conversely, when the input voltage drops below the desired output voltage, the pass transistor conducts more current to compensate and maintain the desired output voltage.

Detailed Application Field Plans

The L78L09ACUTR is commonly used in various electronic applications, including:

1. Power Supplies: It can be used as a voltage regulator in power supply circuits to provide a stable and regulated voltage for other components.
2. Embedded Systems: The regulator is suitable for powering microcontrollers, sensors, and other low-power devices in embedded systems.
3. Consumer Electronics: It finds application in portable devices, such as smartphones, tablets, and digital cameras, where a regulated voltage is required for proper operation.
4. Automotive Electronics: The L78L09ACUTR can be utilized in automotive applications, such as dashboard displays, infotainment systems, and lighting control circuits.

Detailed and Complete Alternative Models

1. LM7809: A popular alternative from Texas Instruments with similar specifications and pin configuration.
2. MC78L09: An alternative from ON Semiconductor offering comparable performance and compatibility.
3. UA78L09: Another alternative from Texas Instruments, widely used in various electronic applications.

These alternative models provide similar functionality and can be used as substitutes for the L78L09ACUTR in most applications.

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