LF85CDT

Product Overview

• Category: Electronic Component
• Use: Power Management
• Characteristics: High Efficiency, Low Power Consumption
• Package: TO-220
• Essence: Voltage Regulator
• Packaging/Quantity: Tape and Reel, 1000 units per reel

Specifications

• Input Voltage: 4.5V - 40V
• Output Voltage: Adjustable from 1.25V to 37V
• Output Current: Up to 3A
• Quiescent Current: 10mA (typical)
• Dropout Voltage: 1.5V (typical)
• Line Regulation: 0.2% (typical)
• Load Regulation: 0.4% (typical)
• Operating Temperature: -40°C to +125°C

Detailed Pin Configuration

The LF85CDT voltage regulator has the following pin configuration:

1. Input (Pin 1): Connects to the input voltage source.
2. Ground (Pin 2): Common ground reference.
3. Output (Pin 3): Provides the regulated output voltage.

Functional Features

• High Efficiency: The LF85CDT offers high efficiency, minimizing power loss during voltage regulation.
• Low Power Consumption: With a low quiescent current, the regulator consumes minimal power when idle.
• Adjustable Output Voltage: The output voltage can be easily adjusted within a wide range to suit various applications.
• Protection Mechanisms: Built-in protection features such as thermal shutdown and current limiting ensure safe operation.

Advantages and Disadvantages

Advantages

• Wide input voltage range allows for versatile use in different systems.
• Excellent line and load regulation ensures stable output voltage.
• Compact TO-220 package facilitates easy integration into various circuit designs.
• High efficiency results in reduced power dissipation and improved energy efficiency.

Disadvantages

• Dropout voltage of 1.5V may limit its use in low voltage applications.
• Quiescent current of 10mA might be relatively high for ultra-low power systems.

Working Principles

The LF85CDT 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, adjusting the pass transistor's resistance to maintain a stable output voltage. This regulation mechanism ensures that the output voltage remains constant despite variations in input voltage and load conditions.

Detailed Application Field Plans

The LF85CDT finds application in various fields, including:

1. Power Supplies: It can be used as a voltage regulator in power supply circuits for electronic devices.
2. Automotive Electronics: The regulator is suitable for automotive applications, providing stable voltage to sensitive components.
3. Industrial Control Systems: It can be utilized in industrial control systems to ensure consistent power delivery.
4. Telecommunications: The LF85CDT can be employed in telecommunications equipment to regulate voltage levels.

Detailed and Complete Alternative Models

1. LM317: A popular adjustable voltage regulator with similar specifications and pin configuration.
2. L78xx: Series of fixed voltage regulators available in various output voltages.
3. LT1083: High current, adjustable linear regulator with low dropout voltage.

These alternative models offer similar functionality and can be considered based on specific requirements and availability.

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