Overview
The LM3631YFFR from Texas Instruments is a comprehensive LCD backlight and bias power solution designed for mobile devices. This integrated chip combines a high-efficiency backlight LED driver with positive and negative bias supplies for LCD drivers, addressing the power needs of high-definition LCDs. The LM3631YFFR is packaged in a 24-pin DSBGA (YFF) package and operates over a temperature range of -40°C to 85°C. Its compact design and high level of integration enable a small solution size while maintaining high performance, making it ideal for small- to medium-size displays.
Key Specifications
| Parameter | Description |
|---|---|
| Package | DSBGA-24 |
| Pins | 24 |
| Operating Temperature Range | -40°C to 85°C |
| Input Voltage Range | 2.7V to 5V |
| Maximum Output Voltage | 29V |
| LED Driver Current | Up to 25mA per channel |
| Backlight Efficiency | Up to 90% |
| LCD Bias Efficiency | > 85% |
| Positive LCD Bias | 4V to 6V, 100mA maximum |
| Negative LCD Bias | -4V to -6V, 80mA maximum |
| LDO Reference Outputs | 4V to 6V, 50mA; 1.8V to 3.3V, 80mA |
Key Features
- Drives up to two strings with a maximum of eight LEDs in series.
- Integrated backlight boost with a 29-V maximum output voltage.
- Two low-side constant-current LED drivers with 25-mA maximum output current.
- Backlight efficiency up to 90% and LCD bias efficiency greater than 85%.
- 11-bit linear or exponential dimming with up to 17-bit output resolution.
- External PWM input for CABC backlight operation.
- Programmable positive and negative LCD bias supplies.
- Two programmable LDO regulator outputs for powering additional peripherals.
- Configurable through I2C interface.
Applications
The LM3631YFFR is primarily used in mobile devices for LCD backlighting and bias power. It is suitable for small- to medium-size displays, making it an ideal solution for smartphones, tablets, and other portable electronic devices. The device's high level of integration and programmability allows it to address various applications without the need for hardware changes.
Q & A
- What is the package type of the LM3631YFFR?
The LM3631YFFR is packaged in a 24-pin DSBGA (YFF) package.
- What is the operating temperature range of the LM3631YFFR?
The operating temperature range is -40°C to 85°C.
- What is the maximum output voltage of the backlight boost?
The maximum output voltage of the backlight boost is 29V.
- How many LEDs can the LM3631YFFR drive?
The LM3631YFFR can drive up to two strings with a maximum of eight LEDs in series.
- What is the efficiency of the backlight and LCD bias?
The backlight efficiency is up to 90%, and the LCD bias efficiency is greater than 85%.
- What are the programmable LCD bias voltage ranges?
The positive LCD bias can be programmed from 4V to 6V with a maximum output current of 100mA, and the negative LCD bias can be programmed from -4V to -6V with a maximum output current of 80mA.
- What are the LDO reference output voltage ranges?
The LDO reference outputs can be set to 4V to 6V with a maximum output current of 50mA, and 1.8V to 3.3V with a maximum output current of 80mA.
- How is the device configured?
The device is configurable through an I2C interface.
- What is the input voltage range of the LM3631YFFR?
The input voltage range is 2.7V to 5V.
- What are some typical applications of the LM3631YFFR?
The LM3631YFFR is typically used in mobile devices for LCD backlighting and bias power, such as smartphones and tablets.
