LM2671N-5.0/NOPB

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Regulator

Characteristics: - High efficiency - Wide input voltage range - Adjustable output voltage - Low dropout voltage - Overcurrent protection - Thermal shutdown protection

Package: TO-220

Essence: The LM2671N-5.0/NOPB is a voltage regulator IC that provides a regulated output voltage from an unregulated input voltage source.

Packaging/Quantity: The LM2671N-5.0/NOPB is typically sold in reels or tubes, with a quantity of 1000 units per reel/tube.

Specifications

• Input Voltage Range: 8V to 40V
• Output Voltage: 5V
• Output Current: Up to 3A
• Dropout Voltage: 1.2V (typical)
• Efficiency: Up to 92%
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The LM2671N-5.0/NOPB has the following pin configuration:

```

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| | --| VIN GND|-- --| VOUT EN |-- --| FB SW |-- |___________| ```

• VIN: Input voltage pin
• GND: Ground pin
• VOUT: Output voltage pin
• EN: Enable pin (active high)
• FB: Feedback pin
• SW: Switching pin

Functional Features

• High Efficiency: The LM2671N-5.0/NOPB utilizes a synchronous buck converter topology, resulting in high efficiency and reduced power dissipation.
• Wide Input Voltage Range: It can accept input voltages ranging from 8V to 40V, making it suitable for a wide range of applications.
• Adjustable Output Voltage: The output voltage can be adjusted using an external resistor divider network.
• Low Dropout Voltage: The dropout voltage is as low as 1.2V, minimizing power loss and maximizing efficiency.
• Overcurrent Protection: The IC incorporates overcurrent protection, which shuts down the regulator in case of excessive load current.
• Thermal Shutdown Protection: It features thermal shutdown protection to prevent damage due to excessive temperature.

Advantages and Disadvantages

Advantages: - High efficiency results in reduced power dissipation - Wide input voltage range allows for versatile applications - Adjustable output voltage provides flexibility - Low dropout voltage minimizes power loss - Overcurrent and thermal shutdown protection enhance reliability

Disadvantages: - Limited output current capacity (up to 3A) - Requires external components for proper operation - Higher cost compared to non-regulated voltage sources

Working Principles

The LM2671N-5.0/NOPB operates on the principle of a synchronous buck converter. It uses a high-frequency switching transistor (SW) to control the energy transfer from the input voltage (VIN) to the output voltage (VOUT). The feedback pin (FB) monitors the output voltage and adjusts the duty cycle of the switching transistor to maintain a stable output voltage. The enable pin (EN) controls the ON/OFF state of the regulator.

Detailed Application Field Plans

The LM2671N-5.0/NOPB is commonly used in various applications, including: - Power supplies for microcontrollers and digital circuits - Battery chargers - Automotive electronics - Industrial control systems - LED lighting applications

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the LM2671N-5.0/NOPB include: - LM2576-5.0: Fixed 5V output voltage, lower cost - LM2596-5.0: Adjustable output voltage, higher output current capacity - LT1370: Higher efficiency, wider input voltage range

These alternative models can be considered based on specific application requirements and design constraints.

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