L4949EP-E

Product Overview

Category: Voltage Regulator
Use: Power management
Characteristics: High precision, low dropout voltage, adjustable output voltage
Package: TO-220
Essence: Linear voltage regulator
Packaging/Quantity: Tube packaging, 50 units per tube

Specifications

• Input Voltage Range: 4.5V to 40V
• Output Voltage Range: 1.2V to 37V
• Dropout Voltage: 0.6V (typical)
• Output Current: Up to 1.5A
• Line Regulation: ±0.3% (typical)
• Load Regulation: ±0.3% (typical)
• Quiescent Current: 10mA (typical)
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The L4949EP-E voltage regulator has the following pin configuration:

1. GND (Ground): Connected to the ground reference of the system.
2. VIN (Input Voltage): Connects to the input voltage source.
3. VOUT (Output Voltage): Provides the regulated output voltage.
4. ADJ (Adjustment): Used to set the desired output voltage.

Functional Features

• High precision: The L4949EP-E offers excellent voltage regulation accuracy, ensuring a stable output voltage even under varying load conditions.
• Low dropout voltage: With a dropout voltage as low as 0.6V, this regulator can operate efficiently even when the input voltage is close to the desired output voltage.
• Adjustable output voltage: The ADJ pin allows users to adjust the output voltage within the specified range, providing flexibility for various applications.

Advantages and Disadvantages

Advantages: - High precision voltage regulation - Low dropout voltage - Adjustable output voltage - Wide input voltage range - Excellent line and load regulation

Disadvantages: - Relatively high quiescent current compared to some other voltage regulators - Limited output current capacity (up to 1.5A)

Working Principles

The L4949EP-E is a linear voltage regulator that uses a pass transistor to regulate the output voltage. It operates by comparing the reference voltage with the feedback voltage obtained from a voltage divider connected to the output. The pass transistor adjusts its resistance to maintain a constant output voltage, compensating for changes in load and input voltage.

Detailed Application Field Plans

The L4949EP-E is commonly used in various applications requiring stable and regulated power supply voltages. Some typical application fields include:

1. Automotive electronics: Used in automotive systems such as engine control units (ECUs), infotainment systems, and lighting control modules.
2. Industrial automation: Provides regulated power for PLCs (Programmable Logic Controllers), motor drives, and sensors.
3. Telecommunications: Used in base stations, routers, and communication equipment to ensure stable power supply.
4. Consumer electronics: Power management in devices like set-top boxes, gaming consoles, and audio amplifiers.

Detailed and Complete Alternative Models

1. LM317: A popular adjustable linear voltage regulator with similar characteristics and pin configuration.
2. LT1084: High current, low dropout voltage regulator suitable for demanding applications.
3. LM1117: Low dropout voltage regulator available in various fixed output voltage options.
4. TPS7A47: Ultra-low noise, high PSRR (Power Supply Rejection Ratio) voltage regulator for sensitive applications.

These alternative models offer different features and specifications, allowing users to choose the most suitable option based on their specific requirements.

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