LM2574BN

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Regulator

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

Package: DIP-8 (Dual In-line Package)

Essence: LM2574BN is a voltage regulator IC that provides a regulated output voltage from an unregulated input voltage source.

Packaging/Quantity: The LM2574BN is typically sold in reels or tubes containing 50 units per package.

Specifications

• Input Voltage Range: 4.5V to 40V
• Output Voltage Range: 1.23V to 37V
• Output Current: Up to 0.5A
• Switching Frequency: 52 kHz
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The LM2574BN has 8 pins arranged as follows:

```

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| | --| Vin GND |-- Pin 1: Ground (GND) --| Vout NC |-- Pin 2: Not Connected (NC) --| FB NC |-- Pin 3: Not Connected (NC) --| ON/OFF NC |-- Pin 4: Not Connected (NC) --| NC NC |-- Pin 5: Not Connected (NC) --| NC NC |-- Pin 6: Not Connected (NC) --| NC NC |-- Pin 7: Not Connected (NC) --| NC Vcc |-- Pin 8: Supply Voltage (Vcc) |___________| ```

Functional Features

• High Efficiency: The LM2574BN utilizes a step-down switching regulator topology, which ensures high efficiency by minimizing power dissipation.
• Wide Input Voltage Range: It can accept input voltages ranging from 4.5V to 40V, making it suitable for a wide range of applications.
• Adjustable Output Voltage: The output voltage can be adjusted using external resistors, allowing flexibility in meeting specific requirements.
• Low Power Consumption: The LM2574BN consumes low quiescent current, resulting in minimal power loss during operation.
• Thermal Shutdown Protection: It incorporates thermal shutdown circuitry that protects the IC from overheating, ensuring reliable operation.

Advantages and Disadvantages

Advantages: - High efficiency leads to reduced power dissipation - Wide input voltage range allows for versatile applications - Adjustable output voltage provides flexibility - Low power consumption results in energy savings - Thermal shutdown protection ensures reliability

Disadvantages: - Limited output current capability (up to 0.5A) - Requires external components for proper operation

Working Principles

The LM2574BN operates as a step-down switching regulator. It converts the higher unregulated input voltage into a lower regulated output voltage by rapidly switching an internal power transistor on and off. This switching action, controlled by feedback circuitry, maintains the desired output voltage despite variations in the input voltage or load conditions.

Detailed Application Field Plans

The LM2574BN is commonly used in various applications, including but not limited to: 1. Power supplies for electronic devices 2. Battery charging circuits 3. Automotive electronics 4. Industrial control systems 5. LED lighting systems 6. Telecom equipment

Detailed and Complete Alternative Models

Some alternative models to LM2574BN that offer similar functionality are: 1. LM2596: A popular buck converter IC with adjustable output voltage and higher output current capability. 2. LM317: A linear voltage regulator IC that provides adjustable output voltage but with lower efficiency compared to switching regulators. 3. LM7805: A fixed-output linear voltage regulator IC that provides a stable 5V output voltage.

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

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