LM3549SQX/NOPB

Product Overview

• Category: Integrated Circuit (IC)
• Use: LED Driver
• Characteristics: High efficiency, compact size, adjustable brightness
• Package: 16-pin WQFN package
• Essence: Regulates current and voltage to drive LEDs
• Packaging/Quantity: Tape and reel packaging, 2500 units per reel

Specifications

• Input Voltage Range: 2.7V to 5.5V
• Output Current Range: 10mA to 500mA
• Dimming Control: PWM or DC voltage control
• Efficiency: Up to 95%
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The LM3549SQX/NOPB has the following pin configuration:

1. EN (Enable)
2. VIN (Input Voltage)
3. GND (Ground)
4. VOUT (Output Voltage)
5. FB (Feedback)
6. DIM (Dimming Control)
7. NC (No Connection)
8. NC (No Connection)
9. NC (No Connection)
10. NC (No Connection)
11. NC (No Connection)
12. NC (No Connection)
13. NC (No Connection)
14. NC (No Connection)
15. NC (No Connection)
16. NC (No Connection)

Functional Features

• Efficiently drives LEDs with adjustable brightness
• Supports both PWM and DC voltage dimming control methods
• Provides over-temperature protection
• Enables thermal shutdown in case of excessive heat
• Offers under-voltage lockout for reliable operation

Advantages and Disadvantages

Advantages

• High efficiency results in energy savings
• Compact size allows for space-saving designs
• Adjustable brightness suits various lighting requirements
• Over-temperature protection ensures device longevity
• Under-voltage lockout enhances reliability

Disadvantages

• Limited output current range (10mA to 500mA)
• Restricted input voltage range (2.7V to 5.5V)

Working Principles

The LM3549SQX/NOPB is an integrated circuit LED driver that regulates the current and voltage required to drive LEDs. It accepts an input voltage ranging from 2.7V to 5.5V and provides an adjustable output current of 10mA to 500mA. The dimming control can be achieved using either PWM or DC voltage control methods.

The device ensures high efficiency, reaching up to 95%, resulting in energy savings. It also incorporates over-temperature protection, which triggers thermal shutdown if the temperature exceeds safe limits. Additionally, under-voltage lockout prevents unreliable operation by disabling the driver when the input voltage falls below a specified threshold.

Detailed Application Field Plans

The LM3549SQX/NOPB LED driver finds applications in various fields, including:

1. Automotive lighting systems
2. Backlighting for LCD displays
3. Portable electronic devices
4. General illumination
5. Architectural lighting
6. Signage and advertising displays

Detailed and Complete Alternative Models

1. LM3409: LED driver with similar specifications but different pin configuration
2. LM3410: Buck LED driver with adjustable output current and voltage
3. LM3421: High-power LED driver with integrated MOSFET
4. LM3492: Synchronous buck LED driver with wide input voltage range
5. LM3552: Boost LED driver with integrated Schottky diode

These alternative models offer similar functionality and can be considered as alternatives to the LM3549SQX/NOPB depending on specific requirements.

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