MP3389EF-LF

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PMIC (power management integrated circuit) are integrated circuits that functions act as an interface between the power sources and loads, to control the flow of power to the load requirement. LED drivers are one type of PMIC, which providing the necessary power from the sources such as AC or DC to drive LEDs efficiently.

MP3389EF-LF is a LED driver PMIC utilizing high-speed current mode PWM controller for the constant current LED application which supports the LED current from 0.1A to 2A. This LED driver has many features in terms of LED driving, LED dimming, over-temperature protection, over voltage protection and one-time programmable optical parameters. It is able to store the LED electrical and optical parameters of the LED factory by the external MCU. Specific parameters such as LED current, LED frequency, and LED on-time etc can be set through the I2C interface.

MP3389EF-LF is an advantage driver IC compare to traditional current based PWM control. Traditional PWM dimming will have a high ripple voltage at the low dimming ratio and cause high stress to LEDs. With the new PFM (pulse frequency modulation) based dimming technology, it will have a lower ripple current compare to PWM dimming, which can reduce the number of LEDs used, lower system cost, and decrease the size of a lighting fixtures. This driver IC has also enable the dimming range up to 2000:1 for smooth dimming experience.

The MP3389EF-LF operating voltage range is from 3.6V to 42V, which offers flexibility to be used in different applications such as automotive, medical, industrial and home applications. Additionally, the LED driver allows external feature to synchronize lights in different LED lighting application while entering the appropriate LED current, frequency, and LED on-time.

The working principle of MP3389EF-LF is simple. First, the voltage from the power source will be connected to the VIN pin of the driver, for DC power source can be connected directly, and for AC power source need to be converted to DC with a rectifier (diode or MOSFETs) circuit. This DC voltage then goes through the on/off pin and will be regulated as the desired current output from the IC. Lastly, a feedback loop between the OVP and UVLO pin and CSA pin must be connected to protect the driver from being over or under voltage. Finally, the dimming input can then be controlled by the MCU with the I2C interface, and the commands and configuration can be stored and remembered, so that the device can be triggered each time to perform automatic controlling.

Moreover, it is important to note that MP3389EF-LF is only available with the SOT-25 package form, meaning it has to be soldered onto the board. The application should also ensure that its size ration, thermal solution, and cool profile can meet the IC requirement as the IC will have risk of high temperature shutdown when operating with high current.

In conclusion, the MP3389EF-LF is a great choice of LED driver for its high accuracy and efficient performance. Its applications of the LED dimming support up to 2000:1 means that it can deliver smooth dimming experience for the user. Moreover, its wide operating voltage range from 3.6V to 42V, and small form factor of SOT-25 package form makes it easily to be used in automotive, medical, industrial, and home LED lighting application.

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