LM2575-3.3BN

Product Overview

Category

The LM2575-3.3BN belongs to the category of voltage regulators.

Use

It is commonly used to regulate and control the output voltage in electronic circuits.

Characteristics

• Input Voltage Range: 4.75V to 40V
• Output Voltage: 3.3V
• Output Current: Up to 1A
• Efficiency: Up to 92%
• Switching Frequency: 52 kHz
• Operating Temperature Range: -40°C to +125°C

Package

The LM2575-3.3BN comes in a TO-263 package, also known as D2PAK or DDPAK.

Essence

This voltage regulator is designed to provide a stable and regulated output voltage for various electronic applications.

Packaging/Quantity

The LM2575-3.3BN is typically packaged in reels or tubes, with a quantity of 250 units per reel/tube.

Specifications

• Input Voltage Range: 4.75V to 40V
• Output Voltage: 3.3V
• Output Current: Up to 1A
• Dropout Voltage: 1.2V (typical)
• Line Regulation: 0.5% (typical)
• Load Regulation: 0.5% (typical)
• Quiescent Current: 10mA (typical)
• Switching Frequency: 52 kHz
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The LM2575-3.3BN has the following pin configuration:

1. VIN (Pin 1): Input voltage pin.
2. GND (Pin 2): Ground reference pin.
3. FB (Pin 3): Feedback pin.
4. VOUT (Pin 4): Output voltage pin.
5. SW (Pin 5): Switching pin.

Functional Features

• Wide input voltage range allows for versatile applications.
• High efficiency ensures minimal power loss.
• Internal thermal shutdown and current limit protection enhance reliability.
• Adjustable output voltage with external resistors.
• Low quiescent current consumption.

Advantages and Disadvantages

Advantages

• Wide input voltage range enables compatibility with various power sources.
• High efficiency reduces energy waste.
• Compact package size facilitates easy integration into circuit designs.
• Internal protection features enhance system reliability.
• Adjustable output voltage provides flexibility in different applications.

Disadvantages

• The switching frequency may introduce noise in sensitive circuits.
• Requires additional external components for proper operation.
• Limited output current capacity compared to some other voltage regulators.

Working Principles

The LM2575-3.3BN is a step-down switching regulator that utilizes pulse-width modulation (PWM) to regulate the output voltage. It operates by rapidly switching an internal power MOSFET on and off, controlling the energy transfer from the input to the output. 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 output voltage. By connecting external resistors to the FB pin, the output voltage can be adjusted to the desired value.

Detailed Application Field Plans

The LM2575-3.3BN finds applications in various electronic systems, including but not limited to:

1. Power supplies for microcontrollers and digital circuits.
2. Battery-powered devices requiring regulated voltage.
3. Automotive electronics, such as car audio systems and lighting controls.
4. Industrial control systems and automation equipment.
5. Portable electronic devices, such as smartphones and tablets.

Detailed and Complete Alternative Models

1. LM2596-3.3V: Similar to LM2575-3.3BN, but with a different package (TO-220) and higher output current capacity.
2. LM317: Adjustable linear voltage regulator suitable for low-power applications.
3. LT1084: High-current adjustable linear voltage regulator with low dropout voltage.

These alternative models offer similar functionality and can be considered based on specific application requirements.

In conclusion, the LM2575-3.3BN is a versatile voltage regulator that provides stable and regulated output voltage for various electronic applications. Its wide input voltage range, high efficiency, and internal protection features make it a popular choice in the industry.