LP8550TLX-A/NOPB

Product Overview

• Category: Integrated Circuit (IC)
• Use: LED Driver
• Characteristics: High Efficiency, Programmable Dimming, Small Package Size
• Package: 20-pin WQFN
• Essence: The LP8550TLX-A/NOPB is a high-efficiency LED driver IC designed for backlighting applications in LCD displays.
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Input Voltage Range: 2.7V to 5.5V
• Output Current Range: Up to 30mA per channel
• Number of Channels: 4
• Dimming Control: PWM (Pulse Width Modulation)
• Operating Temperature Range: -40°C to +85°C
• Efficiency: Up to 92%
• Protection Features: Overvoltage Protection, Overtemperature Protection, Short-Circuit Protection

Pin Configuration

The LP8550TLX-A/NOPB has a 20-pin WQFN package with the following pin configuration:

1. EN (Enable)
2. VIN (Input Voltage)
3. GND (Ground)
4. VOUT (Output Voltage)
5. VLED (LED Power Supply)
6. DIM1 (Channel 1 Dimming Control)
7. DIM2 (Channel 2 Dimming Control)
8. DIM3 (Channel 3 Dimming Control)
9. DIM4 (Channel 4 Dimming Control)
10. NC (No Connection)
11. NC
12. NC
13. NC
14. NC
15. NC
16. NC
17. NC
18. NC
19. NC
20. NC

Functional Features

• High efficiency LED driver with integrated power MOSFETs
• Programmable dimming control for each channel
• Wide input voltage range allows flexibility in power supply selection
• Overvoltage, overtemperature, and short-circuit protection ensure safe operation
• Low quiescent current in shutdown mode for power-saving applications

Advantages

• High efficiency results in lower power consumption and longer battery life
• Programmable dimming control allows for precise adjustment of backlight brightness
• Small package size saves board space in compact designs
• Integrated protection features enhance reliability and prevent damage to the IC and LEDs

Disadvantages

• Limited to 4 channels, may not be suitable for applications requiring more channels
• Requires external components for proper operation (inductors, capacitors, resistors)
• Not compatible with all types of LEDs, may require additional circuitry for specific LED types

Working Principles

The LP8550TLX-A/NOPB operates by converting the input voltage into a regulated output voltage suitable for driving LEDs. It uses a high-efficiency boost converter topology to achieve maximum power conversion efficiency. The integrated power MOSFETs provide the necessary current drive for the LEDs.

The dimming control is achieved through PWM modulation of the LED current. By adjusting the duty cycle of the PWM signal, the average LED current can be varied, resulting in different levels of brightness.

Application Field Plans

The LP8550TLX-A/NOPB is commonly used in various LCD display backlighting applications, including:

1. Mobile devices such as smartphones and tablets
2. Automotive infotainment systems
3. Portable gaming consoles
4. Industrial control panels
5. Medical equipment displays

Alternative Models

If the LP8550TLX-A/NOPB does not meet the specific requirements of a project, alternative LED driver ICs that can be considered include:

1. Texas Instruments TPS61165
2. Maxim Integrated MAX16834
3. ON Semiconductor NCP5623

These alternative models offer similar functionality and features, but may have different specifications or package options.

In conclusion, the LP8550TLX-A/NOPB is a high-efficiency LED driver IC designed for backlighting applications in LCD displays. Its programmable dimming control, small package size, and integrated protection features make it suitable for a wide range of applications. However, designers should consider alternative models if specific requirements are not met by this particular IC.