LM2576-3.3WU-TR

Product Overview

Category

The LM2576-3.3WU-TR belongs to the category of voltage regulators.

Use

This product is commonly used in electronic circuits to regulate and stabilize voltage levels.

Characteristics

• Input Voltage Range: 4V to 40V
• Output Voltage: 3.3V
• Maximum Output Current: 3A
• Efficiency: Up to 92%
• Switching Frequency: 52 kHz
• Operating Temperature Range: -40°C to +125°C

Package

The LM2576-3.3WU-TR comes in a TO-263-7 package, which is a surface-mount package with seven pins.

Essence

The essence of this product lies in its ability to efficiently convert higher input voltages into a stable 3.3V output voltage.

Packaging/Quantity

The LM2576-3.3WU-TR is typically packaged in reels, with 250 units per reel.

Specifications

• Input Voltage Range: 4V to 40V
• Output Voltage: 3.3V
• Output Current: Up to 3A
• Dropout Voltage: 1.2V (typical)
• Line Regulation: ±0.5% (typical)
• Load Regulation: ±0.5% (typical)
• Switching Frequency: 52 kHz
• Operating Temperature Range: -40°C to +125°C
• Package Type: TO-263-7

Detailed Pin Configuration

The LM2576-3.3WU-TR has the following pin configuration:

1. VIN (Input Voltage)
2. GND (Ground)
3. FB (Feedback)
4. COMP (Compensation)
5. EN (Enable)
6. SW (Switch)
7. VOUT (Output Voltage)

Functional Features

• Wide input voltage range allows for versatile applications.
• High efficiency ensures minimal power loss during voltage conversion.
• Overcurrent and thermal protection safeguards the circuit and the LM2576-3.3WU-TR itself.
• Adjustable output voltage through external resistors.
• Soft-start function prevents excessive inrush current during startup.

Advantages

• Compact size and surface-mount package make it suitable for space-constrained designs.
• Efficient voltage regulation reduces power dissipation and extends battery life.
• Wide operating temperature range enables usage in various environments.
• Robust protection features enhance reliability and durability.

Disadvantages

• The switching frequency of 52 kHz may introduce some electromagnetic interference.
• Requires additional external components for proper operation, increasing complexity.

Working Principles

The LM2576-3.3WU-TR is a step-down (buck) voltage regulator that utilizes a switching converter topology. It operates by rapidly switching an internal power transistor on and off to control the output voltage. This switching action allows for efficient voltage conversion while minimizing power dissipation.

The feedback pin (FB) monitors the output voltage and adjusts the duty cycle of the internal switch to maintain a stable 3.3V output. The compensation pin (COMP) is used to optimize the stability of the control loop.

Detailed Application Field Plans

The LM2576-3.3WU-TR finds applications in various fields, including:

1. Power supply modules for microcontrollers and other digital ICs.
2. Battery-powered devices requiring stable voltage levels.
3. Automotive electronics, such as infotainment systems and lighting controls.
4. Industrial automation systems and control circuits.
5. LED lighting applications.

Detailed and Complete Alternative Models

1. LM2596-3.3V: Similar functionality with a different package type (TO-220).
2. LM317: Adjustable voltage regulator with a wider input voltage range.
3. LT1084: Higher current capability (up to 5A) with adjustable output voltage.

These alternative models offer similar voltage regulation capabilities but may have different package types, input/output voltage ranges, or additional features.

In conclusion, the LM2576-3.3WU-TR is a versatile and efficient voltage regulator used in various electronic applications. Its compact size, wide input voltage range, and robust protection features make it a popular choice for designers seeking stable and reliable power supply solutions.