LM3639AYFQT

Product Overview

Category: Integrated Circuit (IC)

Use: The LM3639AYFQT is a high-performance LED driver IC designed for backlighting applications in LCD displays. It provides efficient and precise control of LED brightness, making it suitable for various display devices such as smartphones, tablets, and televisions.

Characteristics: - High efficiency - Precise current regulation - Wide input voltage range - Low power consumption - Compact package size

Package: The LM3639AYFQT is available in a small footprint 32-pin QFN package, which ensures easy integration into space-constrained designs.

Essence: The essence of the LM3639AYFQT lies in its ability to deliver optimal backlighting performance by efficiently driving LEDs with precise current regulation.

Packaging/Quantity: The LM3639AYFQT is typically sold in reels or trays, with a quantity of 2500 units per reel/tray.

Specifications

The LM3639AYFQT features the following specifications:

• Input Voltage Range: 2.7V to 5.5V
• Output Current Range: Up to 1.5A
• Dimming Control: PWM (Pulse Width Modulation)
• Operating Temperature Range: -40°C to +85°C
• Efficiency: Up to 92%
• Package Dimensions: 5mm x 5mm x 0.8mm

Pin Configuration

The LM3639AYFQT has a detailed pin configuration as follows:

Pin Number | Pin Name | Description -----------|----------|------------ 1 | VIN | Power Supply Input 2 | GND | Ground 3 | EN | Enable Pin 4 | DIM | Dimming Control Input 5-12 | LED1-LED8| LED Output Pins 13-16 | NC | No Connection 17 | VOUT | Output Voltage Sense 18-32 | NC | No Connection

Functional Features

The LM3639AYFQT offers the following functional features:

1. Efficient LED Driving: The IC efficiently drives LEDs with high precision, ensuring optimal backlighting performance.
2. Wide Dimming Range: It supports a wide dimming range through PWM control, allowing for flexible adjustment of brightness levels.
3. Current Regulation: The LM3639AYFQT provides precise current regulation, ensuring consistent and uniform brightness across all LEDs.
4. Protection Mechanisms: It incorporates various protection mechanisms such as overvoltage protection, thermal shutdown, and LED open/short detection to enhance reliability and prevent damage.

Advantages and Disadvantages

Advantages: - High efficiency results in lower power consumption. - Precise current regulation ensures uniform brightness. - Wide input voltage range allows for versatile applications. - Compact package size enables easy integration into space-constrained designs.

Disadvantages: - Limited output current range may not be suitable for high-power LED applications. - Lack of built-in fault diagnostics may require additional circuitry for comprehensive system monitoring.

Working Principles

The LM3639AYFQT operates by converting the input voltage into a regulated current source for driving LEDs. It utilizes a pulse width modulation (PWM) technique to control the LED brightness. By adjusting the duty cycle of the PWM signal, the desired brightness level can be achieved. The IC also incorporates feedback mechanisms to regulate the LED current accurately and maintain consistent brightness.

Application Field Plans

The LM3639AYFQT is widely used in various display devices, including but not limited to: - Smartphones - Tablets - Televisions - Monitors - Automotive displays

Its efficient LED driving capabilities and precise current regulation make it suitable for any application that requires backlighting with optimal brightness control.

Alternative Models

For those seeking alternative options, the following models can be considered: - LM3630AYFQT - LM3631AYFQT - LM3632AYFQT - LM3633AYFQT

These models offer similar functionality and characteristics to the LM3639AYFQT, providing flexibility in choosing the most suitable LED driver IC for specific applications.

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