MIC4812YMME-TR

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PMIC (Power-Management Integrated Circuit) LED drivers are designed to control LED brightness and regulate LED power supply. LED drivers are widely used in LED applications such as backlightings, lighting arrays and luminary systems. One of commonly used LED drivers is MIC4812YMME-TR.

Applicaton Field

MIC4812YMME-TR is a wide-input voltage range step-up DC/DC converter which is capable of driving 2 strings of LEDs. It can work stably from 4V to 28V input voltage range and deliver the output up to 40V. It also offers the extremely precise output current accuracy at +/-10%. With its built-in soft start and frequency compensation feature, MIC4812YMME-TR is designed to extend the service life of LEDs. The dynamic voltage adjustoion feature allows the MIC4812YMME-TR to be used with light sensing. The output voltage and current are adjustable through an I2C/SMBus interface. In addition, It can also be pfogrammed to shutdown and enter sleep modes. The integrated thermal limit protection and UVLO features add to the safety features and provide the required protection to the LEDs.

Due to the diverse features, MIC4812YMME-TR can be used in various applications, such as:

• Back lighting
• LCD displays
• Traffic signals
• Automotive interior & exterior lighting
• Industrial equipment
• Portable electronic devices
• Toy & gaming systems
• Solar lighting

Working Principle

MIC4812YMME-TR is able to regulate LED brightness by setting the output current. It achieves this by employing a Constant-Current Control (CCC) approach. This approach uses a current sensing P-MOSFET and a stainless output bandwidth control to ensure constant current mode operation. As a result, the current through the LED can be regulated precisely.

The MIC4812YMME-TR is able to change the output current through an I2C/SMBus interface. This enables the user to easily adjust the desired current. It also offers the ability to adjust the current through a voltage control. This enables the user to adjust the output current without the need for external control circuitry.

The MIC4812YMME-TR also employs a current-recovery feature. This feature allows the device to recover from a fault condition in which the output current is too low. Upon reaching the recovery condition, the device will slowly recover the output current to the desired level. This feature provides the user with additional protection to the LED.

In addition, the MIC4812YMME-TR also offers a power limit feature. This feature limits the output current to the maximum level set by the user. When the set limit is exceeded, the device will immediately shut down to protect the LED. This feature provides the added safety needed when driving LEDs.

Conclusion

The MIC4812YMME-TR is a LED driver IC designed to control LED brightness and regulate LED power supply. It is designed to offer precise output current accuracy, extend LED service life and provide additional safety features. With its wide-input voltage range and precise output current, the MIC4812YMME-TR is suitable for driving various LED applications, such as back lighting, LCD displays, traffic signals, automotive lighting and industrial equipment. Its current-recovery and power limit features provide the user with additional protection to the LED.

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