MAX8631XETI+

The MAX8631XETI+ can be classified as a PMIC (Power Management Integrated Circuit) LED driver. It is designed to allow for the high-current, low ripple, and efficient LED driving of backlighting solutions in LED displays. This LED driver is commonly found in consumer electronics such as smartphones, tablets, and TV sets. It is ideal for applications that require high current LED lighting, and dynamic merging of multiple strings of LED backlighting.

The MAX8631XETI+ is ideal as an LED driver because it allows for high current operation while also utilizing a low voltage input.It offers several benefits when compared to its counterparts. For instance,it has integrated temperature sensing, protected dimming controls, and multiple string dimming options. Moreover, it has a maximum output current rating of 1.5A per string peak, and is available in multiple configurations Including the MAX8631XEBP+, which is suitable for large size LCD displays.

The working principle of the MAX8631XETI+ is based on pulse width modulation (PWM), which is a technique commonly found in LED drivers. PWM works by varying the duty cycle of a continuously-running signal to control the average power consumed by an LED. By varying the duty cycle, the average (or peak) brightness of the LED can be adjusted to the desired level. It should be noted that the LED current varies considerably with the duty cycle and is handled by the LED driver.

The MAX8631XETI+ utilizes three PWM dimming inputs, each of which can be used to adjust the brightness of different strings of LEDs. Each of these dimming inputs can be programmed with a range of “nits” (the SI unit of luminous intensity) for brightness control. This allows for the dynamic merging of multiple strings of LEDs for backlighting applications. This can be useful for applications such as LCDs that require wide dynamic backlight range.

The MAX8631XETI+ also has a temperature sensing circuit, which is used to protect the LEDs from possible thermal overloads. On-board thermal sensing ensures that the LEDs remain within the safe operating limits, and if the temperature rises to unsafe levels, the LED driver will automatically reduce the current to the LEDs to maintain their safe operating point.

The MAX8631XETI+ also has on-board protection circuitry such as reverse-voltage protection and over-voltage protection. Additionally, the dimming inputs have both open-circuit protection and short-circuit protection, along with thermal shutdown which automatically reduces and shuts off the LED current when overheating occurs.

Overall, the MAX8631XETI+ is a highly-efficient and versatile LED driver that is well-suited for backlighting applications in mobile applications such as smartphones. It incorporates numerous features such as thermal sensing, dimming controls, and multiple-string dimming to ensure that the LEDs are operating within safe limits.