FL663MX Integrated Circuits (ICs)

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FL663MX is a high-current, constant-current LED driver IC from STMicroelectronics. It is a low-voltage/low-power, highly integrated, dedicated solution for small powering of LED networks (up to 20 LEDs). The chip is equipped with high protection set, fail-safe soft dimming, advanced diagnostics and an I2C interface for a high degree of customization. It is highly suitable for LED applications that require a small form factor, high brightness, superior reliability and controllability.

Application fields

FL663MX can be used in automotive applications, outdoor/industrial lighting, professional appliances as well as in Android-based smartphones/tablets/computers. The chip provides superior illumination efficiency and guaranteed performance in difficult lighting circumstances. It supports an extremely wide range of LED driving and current matching flexibility across multiple LED strings, allowing for a wide range of lighting effects.

Working Principle

The FL663MX LED driver is controlled by the I2C interface. It provides an integrated set of protections such as over-voltage, over-temperature and open LED failures management. For fail-safe soft dimming, a unique analog-controlling technique for non-significant strings reduction is used. This allows for smooth, glitch-less illumination level transitions. The chip also supports advanced diagnostic features, such as for example reporting of over-temperature, open LED and over-current events. It can accurately detect the status of LEDs and provide feedback to the controller in order to improve the end product\'s reliability.

Apart from the fail-safe soft dimming and I2C control, the chip also supports an analog mode of driving and manual current setting. In this configuration, a dedicated current setting pin is used to set the required current level. This helps simplify the design process, since the current setting is done outside the microcontroller.

The FL663MX is a cost-efficient solution for driving LED strings of up to 20 LEDs. It provides relatively high power efficiency due to its low-voltage operation and low power consumption. Its integrated protection ensures LED failure diagnostics and optimized LED lighting. Furthermore, its I2C interface can be used for precise LED illumination control and a unique analog-controlling technique guarantees glitch-less output.

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