LM3551SDX

Product Overview

Category: Integrated Circuit (IC)

Use: The LM3551SDX is a versatile IC primarily used for controlling and driving light-emitting diodes (LEDs). It is commonly employed in various lighting applications, such as backlighting for LCD displays, keypad illumination, and indicator lights.

Characteristics: - High efficiency LED driver - Wide input voltage range - Adjustable output current - Low dropout voltage - Over-temperature protection - Small form factor

Package: The LM3551SDX is available in a small outline package (SOP) with a thermal pad for efficient heat dissipation. This package ensures easy integration into compact electronic devices.

Essence: The essence of the LM3551SDX lies in its ability to efficiently drive LEDs while maintaining a small footprint and providing flexibility in terms of input voltage and output current control.

Packaging/Quantity: The LM3551SDX is typically sold in reels or tubes, with a quantity of 2500 units per reel or 90 units per tube.

Specifications

The LM3551SDX features the following specifications:

• Input Voltage Range: 2.7V to 5.5V
• Output Current Range: Up to 30mA
• Dropout Voltage: 200mV (typical)
• Operating Temperature Range: -40°C to +85°C
• Thermal Resistance (θJA): 70°C/W

Pin Configuration

The LM3551SDX has a total of 6 pins, each serving a specific function:

1. VIN: Input voltage pin
2. GND: Ground pin
3. EN: Enable pin for turning the device on/off
4. ADJ: Adjust pin for setting the output current level
5. FB: Feedback pin for monitoring the LED current
6. VOUT: Output voltage pin

Functional Features

The LM3551SDX offers the following functional features:

• High-efficiency LED driver with adjustable output current
• Integrated over-temperature protection for enhanced reliability
• Wide input voltage range allows compatibility with various power sources
• Low dropout voltage minimizes power dissipation and extends battery life
• Compact package with thermal pad ensures efficient heat dissipation

Advantages and Disadvantages

Advantages: - Efficient LED driving capability - Flexibility in adjusting output current - Wide input voltage range for versatile applications - Small form factor for easy integration - Over-temperature protection enhances reliability

Disadvantages: - Limited maximum output current (up to 30mA) - Not suitable for high-power LED applications

Working Principles

The LM3551SDX operates as a constant current LED driver. It regulates the LED current by adjusting the voltage across the LED load. The EN and ADJ pins control the device's operation, allowing users to turn it on/off and set the desired output current level.

Detailed Application Field Plans

The LM3551SDX finds application in various fields, including: 1. LCD backlighting in smartphones, tablets, and other portable devices 2. Keypad illumination in electronic devices 3. Indicator lights in automotive and industrial applications 4. General-purpose LED lighting systems

Alternative Models

For those seeking alternative options, the following models can be considered: 1. LM3552SDX 2. LM3553SDX 3. LM3554SDX

These models offer similar functionality and characteristics to the LM3551SDX, providing flexibility in choosing the most suitable option for specific applications.

In conclusion, the LM3551SDX is a highly efficient LED driver IC designed for various lighting applications. Its small form factor, wide input voltage range, and adjustable output current make it a versatile choice. However, its limited maximum output current may restrict its use in high-power LED applications.