MAX8631YETI+TW

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This article guides readers to understand the application field and working principle of a PMIC (Power Management Integrated Circuit) named MAX8631YETI+TW. The MAX8631YETI+TW is an LED (Light Emitting Diode) Driver. It supports up to 4 LEDs, including the traditional blue, white, red or green, and feature adaptive control with no external components.

Application Field

The MAX8631YETI+TW is optimized for backlighting applications in smartphones, tablets, and industrial equipment. It provides a complete solution for controlling the brightness and color of LEDs. Its small size and minimal power consumption makes it ideal for portable and space-limited applications.

Working Principle

The MAX8631YETI+TW can operate in two modes – software mode or hardware mode. In software mode, it monitors the high accuracy internal temperature reference and adjusts the LED current accordingly to dynamically maintain a constant LED intensity over temperature. In hardware mode, the MAX8631YETI+TW is configurable to operate in open loop mode (without feedback) or closed loop mode (with feedback). When operating in closed loop mode, the PWM (Pulse Width Modulation) output signal can be used to control the LED intensity.

The MAX8631YETI+TW features an integrated constant current regulator that drives up to four LEDs. This regulator operates in pulse width modulation (PWM) mode to control the LED illumination level. The PWM signal can be generated using an external oscillator or via a host controller such as a microcontroller. The MAX8631YETI+TW includes an adjustable current limit that allows current control without the need of an external series resistor part.

The MAX8631YETI+TW can also be used to set the LED backlight brightness. It incorporates a step dimmer with five steps, which can be set by controlling one input line. The integrated PWM dimming modulator can be used to reduce the current consumption of the LED drivers and thus achieving very low LED backlight brightness for LCD displays.

The MAX8631YETI+TW also provides an optional over-temperature protection (OTP) feature. This feature allows the IC to power down the LED current when the internal temperature threshold is exceeded. This helps to protect the IC and the surrounding electronics from temperature related damage.

Conclusion

In conclusion, the MAX8631YETI+TW is a PMIC (Power Management Integrated Circuit) which is optimized for LED Driver applications. It supports up to 4 LEDs and provides a complete solution for controlling the brightness and color of LEDs, including adaptive control with no external components. It also features an adjustable current limit and optional over-temperature protection to protect the IC and the surrounding electronics.

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