LM3509SDX/NOPB

Product Overview

• Category: Integrated Circuit (IC)
• Use: LED Driver
• Characteristics: High Efficiency, Adjustable Current, Wide Input Voltage Range
• Package: LLP-10 (Leadless Package)
• Essence: The LM3509SDX/NOPB is a high-efficiency LED driver IC designed to drive up to 6 series-connected LEDs with a wide input voltage range.
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Input Voltage Range: 2.7V to 5.5V
• Output Current Range: Up to 30mA
• Switching Frequency: 1.2MHz
• Dimming Control: PWM (Pulse Width Modulation)
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The LM3509SDX/NOPB has the following pin configuration:

1. VIN: Input voltage pin
2. GND: Ground pin
3. EN: Enable pin
4. DIM: Dimming control pin
5. FB: Feedback pin
6. LX: Switch node pin
7. SW: Switch pin
8. VOUT: Output voltage pin
9. NC: No connection
10. NC: No connection

Functional Features

• High efficiency up to 90%
• Adjustable output current through external resistor
• Wide input voltage range allows for battery-powered applications
• Integrated soft-start feature for controlled startup
• Over-temperature protection
• Short-circuit protection

Advantages and Disadvantages

Advantages

• High efficiency leads to longer battery life in portable devices
• Adjustable output current allows flexibility in LED brightness control
• Wide input voltage range enables usage with various power sources
• Integrated protection features enhance reliability

Disadvantages

• Limited output current range may not be suitable for high-power LED applications
• LLP-10 package may require specialized equipment for soldering and handling

Working Principles

The LM3509SDX/NOPB is a step-up DC-DC converter that uses a fixed-frequency, current-mode architecture to drive LEDs. It converts the input voltage to a higher voltage required by the LED string while regulating the output current. The dimming control pin allows for brightness adjustment using PWM signals.

Detailed Application Field Plans

The LM3509SDX/NOPB is commonly used in various applications, including:

1. Portable electronic devices such as smartphones, tablets, and portable gaming consoles
2. Automotive interior and exterior lighting
3. Backlighting for LCD displays and keypads
4. General-purpose LED lighting

Detailed and Complete Alternative Models

1. LM3409: Similar LED driver IC with higher output current capability
2. LM3410: Step-up LED driver IC with integrated Schottky diode
3. LM3508: LED driver IC with lower input voltage range and adjustable switching frequency

These alternative models offer different specifications and features to suit specific application requirements.

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