LM3551SD

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Regulator for LED Backlighting

Characteristics: - High efficiency - Wide input voltage range - Adjustable output current - Low dropout voltage - Over-temperature protection - Short-circuit protection

Package: Small Outline Package (SOP)

Essence: The LM3551SD is a voltage regulator IC specifically designed for LED backlighting applications. It provides efficient power management for LED drivers, ensuring optimal performance and longevity.

Packaging/Quantity: The LM3551SD is available in SOP packages. The quantity per package may vary depending on the supplier.

Specifications

The LM3551SD has the following specifications:

• Input Voltage Range: 2.7V to 5.5V
• Output Current Range: Up to 1A
• Dropout Voltage: 200mV at 350mA
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The LM3551SD has the following pin configuration:

1. VIN: Input voltage pin
2. GND: Ground pin
3. EN: Enable pin
4. FB: Feedback pin
5. ADJ: Adjust pin
6. SW: Switch pin
7. LX: Inductor connection pin

Functional Features

The LM3551SD offers the following functional features:

• High efficiency conversion of input voltage to regulated output current
• Adjustable output current through external resistor
• Over-temperature protection to prevent damage due to excessive heat
• Short-circuit protection to safeguard against current overload

Advantages and Disadvantages

Advantages: - High efficiency ensures minimal power loss - Wide input voltage range allows for versatile applications - Adjustable output current enables customization - Over-temperature and short-circuit protection enhance reliability

Disadvantages: - Limited output current range may not be suitable for high-power applications - Requires external components for proper operation

Working Principles

The LM3551SD operates as a voltage regulator by converting the input voltage to a regulated output current. It utilizes an internal switch and inductor to efficiently control the power flow. The adjustable output current is achieved by setting the appropriate feedback resistor value.

Detailed Application Field Plans

The LM3551SD is commonly used in various LED backlighting applications, including:

1. LCD monitors and televisions
2. Laptop and tablet displays
3. Automotive infotainment systems
4. Handheld devices such as smartphones and portable gaming consoles

Detailed and Complete Alternative Models

Some alternative models that can be considered as alternatives to the LM3551SD are:

1. LM3552SD
2. LM3553SD
3. LM3554SD
4. LM3555SD

These models offer similar functionality and characteristics, providing flexibility in choosing the most suitable option for specific applications.

In conclusion, the LM3551SD is a highly efficient voltage regulator IC designed for LED backlighting applications. Its adjustable output current, wide input voltage range, and protection features make it a reliable choice for various electronic devices.