LM2674M-3.3/NOPB

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Regulator

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

Package: SOP-8

Essence: The LM2674M-3.3/NOPB is a step-down switching voltage regulator IC that provides a regulated output voltage with high efficiency.

Packaging/Quantity: The LM2674M-3.3/NOPB is available in a standard SOP-8 package and is typically sold in reels of 2500 units.

Specifications

• Input Voltage Range: 8V to 40V
• Output Voltage: 3.3V
• Output Current: Up to 1A
• Switching Frequency: 260kHz
• Dropout Voltage: 1.2V (max)
• Efficiency: Up to 92%
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The LM2674M-3.3/NOPB has the following pin configuration:

___________ | | IN |1 5| GND | | FB |2 4| SW | | EN |3 6| NC |___________|

Functional Features

1. High Efficiency: The LM2674M-3.3/NOPB utilizes a synchronous rectification topology, resulting in high conversion efficiency.
2. Wide Input Voltage Range: It can accept input voltages ranging from 8V to 40V, making it suitable for various applications.
3. Low Dropout Voltage: The regulator maintains a low dropout voltage, ensuring stable output even when the input voltage is close to the desired output voltage.
4. Adjustable Output Voltage: The output voltage can be adjusted using external resistors, allowing flexibility in different applications.
5. Thermal Shutdown Protection: The IC incorporates a thermal shutdown feature that protects it from overheating, ensuring safe operation.

Advantages and Disadvantages

Advantages: - High efficiency leads to reduced power dissipation - Wide input voltage range allows for versatile usage - Low dropout voltage ensures stable output - Adjustable output voltage provides flexibility - Thermal shutdown protection enhances safety

Disadvantages: - Limited output current capacity (up to 1A) - Requires external components for proper operation

Working Principles

The LM2674M-3.3/NOPB operates as a step-down switching voltage regulator. It uses a pulse-width modulation (PWM) control scheme to regulate the output voltage. The internal power MOSFET switches on and off at a high frequency, converting the input voltage to the desired output voltage with minimal power loss. The feedback pin (FB) monitors the output voltage and adjusts the duty cycle of the internal switch to maintain a stable output.

Detailed Application Field Plans

The LM2674M-3.3/NOPB is commonly used in various applications, including: 1. Power supplies for microcontrollers and digital circuits 2. Battery-powered devices 3. Automotive electronics 4. Industrial automation systems 5. LED lighting applications

Detailed and Complete Alternative Models

Some alternative models to the LM2674M-3.3/NOPB include: - LM2674M-5.0/NOPB: Provides a fixed 5V output voltage - LM2674M-ADJ/NOPB: Adjustable output voltage version with a wider input voltage range - LM2674MX-3.3/NOPB: Surface-mount package variant with the same specifications

These alternative models offer similar functionality but may have different output voltages or package options to suit specific requirements.

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