LM2574-3.3BN

Product Overview

Category

The LM2574-3.3BN belongs to the category of voltage regulators.

Use

It is primarily used for regulating and converting input voltages to a fixed output voltage of 3.3V.

Characteristics

• Input Voltage Range: 4.5V to 40V
• Output Voltage: 3.3V
• Output Current: Up to 0.5A
• Efficiency: Up to 90%
• Switching Frequency: 52 kHz
• Operating Temperature Range: -40°C to +125°C

Package

The LM2574-3.3BN comes in a TO-263 package, which is a surface-mount package with three pins.

Essence

The essence of LM2574-3.3BN lies in its ability to efficiently regulate and convert input voltages to a stable 3.3V output, making it suitable for various electronic applications.

Packaging/Quantity

The LM2574-3.3BN is typically available in reels or tubes, with a quantity of 250 units per reel/tube.

Specifications

• Input Voltage Range: 4.5V to 40V
• Output Voltage: 3.3V
• Output Current: Up to 0.5A
• Dropout Voltage: 1.2V (typical)
• Quiescent Current: 8mA (typical)
• Switching Frequency: 52 kHz
• Operating Temperature Range: -40°C to +125°C
• Package Type: TO-263

Detailed Pin Configuration

The LM2574-3.3BN has three pins:

1. Pin 1 (VIN): This pin is used to connect the input voltage source.
2. Pin 2 (GND): This pin is connected to the ground reference.
3. Pin 3 (VOUT): This pin provides the regulated output voltage of 3.3V.

Functional Features

• Wide input voltage range allows for flexibility in various applications.
• High efficiency ensures minimal power loss during voltage conversion.
• Overcurrent protection safeguards the circuit from excessive current flow.
• Thermal shutdown protection prevents damage due to overheating.
• Short-circuit protection ensures the safety of the device and connected components.

Advantages and Disadvantages

Advantages

• Wide input voltage range enables compatibility with different power sources.
• High efficiency reduces power dissipation and extends battery life.
• Compact package size facilitates easy integration into space-constrained designs.
• Built-in protection features enhance reliability and prevent damage.

Disadvantages

• Limited output current capacity may not be suitable for high-power applications.
• Switching frequency may introduce electromagnetic interference in sensitive circuits.
• Requires external components for proper operation, increasing overall system complexity.

Working Principles

The LM2574-3.3BN operates as a step-down switching regulator. It utilizes a pulse-width modulation (PWM) control scheme to regulate the output voltage. The input voltage is first chopped into high-frequency pulses using an internal oscillator. These pulses are then fed to the internal power switch, which controls the energy transfer to the output. Through feedback control, the duty cycle of the pulses is adjusted to maintain a stable 3.3V output voltage.

Detailed Application Field Plans

The LM2574-3.3BN finds applications in various fields, including:

1. Battery-powered devices: It can be used to regulate the voltage in portable electronics, such as smartphones, tablets, and digital cameras.
2. Industrial automation: It is suitable for powering sensors, actuators, and control systems in industrial automation equipment.
3. Automotive electronics: The LM2574-3.3BN can be employed in automotive applications, such as powering infotainment systems, lighting modules, and control units.
4. Telecommunications: It can be utilized in telecom equipment, including routers, switches, and base stations, to ensure stable voltage supply.

Detailed and Complete Alternative Models

1. LM2574-5.0BN: Similar to LM2574-3.3BN but provides a fixed output voltage of 5V.
2. LM2596S-ADJ: A step-down switching regulator with adjustable output voltage.
3. LM317T: A linear voltage regulator that can provide adjustable output voltages.

These alternative models offer different output voltages and may have varying specifications, but they serve similar purposes as the LM2574-3.3BN.

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