LM3405AXMY/NOPB

Product Overview

Category: Integrated Circuits (ICs)

Use: The LM3405AXMY/NOPB is a high-efficiency, constant current LED driver. It is designed to drive a single LED or multiple LEDs in series with a forward voltage of up to 40V.

Characteristics: - High efficiency: The LM3405AXMY/NOPB utilizes a step-up DC-DC converter topology, providing high efficiency power conversion for LED lighting applications. - Constant current output: It delivers a regulated constant current to the connected LEDs, ensuring consistent brightness and preventing damage due to overcurrent. - Wide input voltage range: The IC can operate from an input voltage as low as 3V up to a maximum of 30V, making it suitable for various power supply configurations. - Adjustable output current: The LM3405AXMY/NOPB allows the user to set the desired LED current through an external resistor, providing flexibility in LED brightness control.

Package: The LM3405AXMY/NOPB is available in a small outline package (SOT-23-5), which offers compact size and ease of integration into space-constrained designs.

Essence: This LED driver IC provides efficient and reliable power conversion for driving LEDs, ensuring optimal performance and longevity of the lighting system.

Packaging/Quantity: The LM3405AXMY/NOPB is typically sold in reels containing 3000 units per reel.

Specifications

• Input Voltage Range: 3V to 30V
• Maximum Output Current: 1A
• Maximum Switching Frequency: 1.6MHz
• Operating Temperature Range: -40°C to +125°C
• Dimming Control: Analog/PWM

Pin Configuration

The LM3405AXMY/NOPB features a 5-pin SOT-23 package with the following pin configuration:

1. VIN: Input voltage
2. GND: Ground
3. FB: Feedback pin for setting the output current
4. EN: Enable pin for turning the IC on/off
5. SW: Switching node for connecting the inductor and LED load

Functional Features

• High-efficiency step-up DC-DC converter for driving LEDs
• Constant current output regulation for consistent brightness
• Wide input voltage range for versatile power supply compatibility
• Adjustable output current for flexible LED brightness control
• Over-temperature protection for enhanced reliability

Advantages and Disadvantages

Advantages: - High efficiency leads to reduced power consumption and longer battery life. - Constant current output ensures consistent brightness and prevents LED damage. - Wide input voltage range allows for compatibility with various power sources. - Adjustable output current provides flexibility in LED brightness control.

Disadvantages: - Limited maximum output current of 1A may not be suitable for high-power LED applications. - SOT-23 package may have thermal limitations in high-power designs.

Working Principles

The LM3405AXMY/NOPB operates as a step-up DC-DC converter. It converts the input voltage to a higher voltage required to drive the connected LED(s) with a constant current. The feedback pin (FB) is used to set the desired output current by connecting an external resistor. The enable pin (EN) controls the on/off state of the IC, allowing for power management. The switching node (SW) connects the inductor and LED load, enabling efficient power transfer.

Detailed Application Field Plans

The LM3405AXMY/NOPB is commonly used in various LED lighting applications, including: - Automotive lighting - Backlighting for LCD displays - Portable devices - General illumination

Detailed and Complete Alternative Models

Some alternative models to the LM3405AXMY/NOPB include: - LM3406: Similar functionality with a higher maximum output current of 1.5A. - LM3410: Step-up DC-DC converter with integrated Schottky diode for simplified design. - LT3474: High-power LED driver with additional features such as PWM dimming control.

These alternative models offer different specifications and features, allowing designers to choose the most suitable option for their specific application requirements.

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