MIC2842AYMT-TR

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PMICs (Power Management Integrated Circuits) can be used to increase the efficiency, accuracy, and various other features of power management operations by directly controlling and monitoring power-related features. One variety of PMICs are called LED Drivers, which are circuits built specifically to drive and control the current used for lighting purposes. An example of such a device is the MIC2842AYMT-TR, a low saturation current, low-voltage regulator and current controller combo package by Micrel. This device is well suited for driving multiple LEDs in many application areas as it provides high flexibility due to its wide input voltage range, adjustable current level, and low current ripple.

Application Field

One major application area of the MIC2842AYMT-TR is backlighting in the mobile phone and portable device market. Its wide input voltage range and low quiescent current make it well suited for portable batteries, and the adjustable current level helps to appropriately adjust the brightness levels dependent upon the application.

The MIC2842AYMT-TR can also be used for LED lighting in general applications such as in televisions, automobile lighting, LED strips in commercial buildings, and more. Its low saturation current allows it to pass a larger amount of current to the LED, increasing the brightness, and its low ripple current reduces the LEDs flickering effect, creating smoother lighting.

Working Principle

The MIC2842AYMT-TR has two main parts that make it effective for LED driving applications. The first is a power regulation unit that allows adjustment of the output current with its wide input voltage range by converting high AC/DC voltages into low DC/DC voltages. The second part is a current control unit that allows the battery to be driven in a manner to maximize output while simultaneously controlling the ripple current.

The regulator utilizes a voltage feedback loop to maintain the desired output voltage. It has compensation select pins built in which can be used to adjust the loop gain to achieve the best stability. The regulator also includes an enable pin which can be used to turn the device completely off in order to save power, as well as an overvoltage protection (OVP) feature for enhanced safety.

The current controller utilizes a current feedback loop to maintain the desired output current. The current loop is achieved by detecting current through an internal sense resistor and controlling the gate voltage accordingly. This ensures that a constant minimum current is maintained when the load is increasingly driven, thus preventing overshoot and protecting the load from high current surges. Additionally, this unit also has an internal thermal protection feature, which is important for devices where the environmental temperature may vary.

Conclusion

The MIC2842AYMT-TR is a useful device for LED driving applications, especially in the mobile phone and portable device market. Its wide input voltage range and adjustable current level give it high flexibility to meet the needs of a variety of applications and its low saturation current and ripple current help to improve the lighting quality and reduce flickering. Together, these features make the MIC2842AYMT-TR a great choice for LED drivers in the mobile and portable device markets.

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