MP4689DN-LF

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PMIC -LED drivers are circuits used to electrically drive a light-emitting diode (LED) display. The purpose of such circuits is to control light intensity, allowing a user to dim or brighten their display. One type of PMIC-LED driver is the MP4689DN-LF. This article reviews the application field and working principle of the MP4689DN-LF.

Application Field

The MP4689DN-LF offers applications for illumination, display, and general driver ICs that require a wide range of features for small to medium-sized displays. It is also compatible with most TFT and LCD displays, as well as white LED backlighting for ultra-thin lighting solutions. The MP4689DN-LF is available in a variety of packages, making it suitable for a wide range of applications. For example, it can be used in the automotive, industrial, and medical industries, as well as in home appliances, computers and mobile devices.

The MP4689DN-LF is equipped with digital dimming control, enabling the user to adjust the LED backlight brightness with very high precision. It also has built-in output voltage and current protection that increases LED lifespan. The MP4689DN-LF also offers a wide range of output voltage and current levels with precise accuracy to ensure compatibility with various LED backlights. With these features, the MP4689DN-LF can be used for lighting applications in small to medium-sized displays.

Working Principle

The working principle of the MP4689DN-LF is relatively simple. The driver IC is composed of a main supply voltage control block (VIOT) and a charge pump control block (CDC). The VIOT blocks are used to control the main supply voltage and the CDC blocks are used to control the correct and precise output voltage of the LED.

The VIOT blocks are composed of a voltage reference (Vref), a fixed resistor (R1), a variable resistor (R2), and a voltage divider (VD). When the voltage at the output of the VD is higher than the Vref, the VIOT block adjusts the output voltage of the Vref to increase the output voltage of the LED. Conversely, when the voltage at the output of the VD is lower than the Vref, the VIOT block adjusts the output voltage of the Vref to decrease the output voltage of the LED.

The CDC blocks are composed of a MOSFET switch (SW), a frequency divider (Fdiv), and a charge pump (CP). When the output of the VD is accurate, the Fdiv will generate the frequency required to operate the switch. The CP will then charge and discharge the capacitor within the LED to raise and lower the output voltage level. This voltage is then regulated by the VIOT block.

The MP4689DN-LF is an efficient and reliable LED driver solution, offering excellent performance and long LED life. Its built-in adjustable output voltage and current protection makes it suitable for a variety of applications. It is also easy to use and provides precise accuracy, enabling the user to control the brightness of their LED display.

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