L4941BDT

Product Overview

• Category: Voltage Regulator
• Use: To regulate and stabilize the output voltage in electronic circuits
• Characteristics: High precision, low dropout voltage, low quiescent current
• Package: TO-220, DPAK, SO-8
• Essence: Linear voltage regulator
• Packaging/Quantity: Available in tape and reel packaging, quantity varies depending on supplier

Specifications

• Input Voltage Range: 4.4V to 40V
• Output Voltage Range: 2.85V to 36V
• Output Current: Up to 1.5A
• Dropout Voltage: 1.2V (typical)
• Quiescent Current: 50µA (typical)
• Line Regulation: 0.03% (typical)
• Load Regulation: 0.3% (typical)
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The L4941BDT has a standard pin configuration with three pins:

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

Functional Features

• High Precision: The L4941BDT offers high accuracy in regulating the output voltage, ensuring stable performance.
• Low Dropout Voltage: With a low dropout voltage of 1.2V, the regulator can maintain a stable output even when the input voltage is close to the desired output voltage.
• Low Quiescent Current: The device consumes minimal current when in standby mode, reducing power consumption.
• Short Circuit Protection: The regulator includes built-in protection against short circuits, preventing damage to the device and the connected circuitry.
• Thermal Shutdown: In case of excessive temperature, the L4941BDT automatically shuts down to prevent overheating.

Advantages and Disadvantages

Advantages: - High precision regulation - Low dropout voltage - Low quiescent current - Short circuit protection - Thermal shutdown feature

Disadvantages: - Limited output current capacity (up to 1.5A) - Requires external capacitors for stability

Working Principles

The L4941BDT 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 from a voltage divider network. The pass transistor adjusts its resistance to maintain a constant output voltage despite changes in the input voltage or load conditions.

Detailed Application Field Plans

The L4941BDT is commonly used in various electronic applications, including:

1. Power supplies for microcontrollers and digital circuits
2. Battery-powered devices requiring stable voltage levels
3. Automotive electronics, such as car audio systems and dashboard displays
4. Industrial control systems and automation equipment
5. Communication devices, such as routers and modems

Detailed and Complete Alternative Models

1. LM317: A popular adjustable linear voltage regulator with similar characteristics and pin configuration.
2. LT1083: A high-current linear voltage regulator suitable for applications requiring higher output currents.
3. LM1117: A low dropout voltage regulator available in various fixed output voltages.

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

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