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A MIC29303BU is an adjustable positive linear three-terminal voltage regulator with low-current device. It features an adjustable output up to 2.9V and up to 90mA of output current. The MIC29303BU is a drop in replacement for adjustable linear voltage regulators, such as the LM123 series and LM323 series, and can be used in a variety of applications.

MIC29303BU Application Field

The MIC29303BU is an ideal solution for applications like mobile devices, smart wearables, and industrial control systems where fine adjustments in the output voltage and current have to be made. It is also ideal for portable devices that require an adjustable voltage range while maintaining high efficiencies. It can also be used to power low-power analog sub-systems, as well as low-power digital sub-systems.

The MIC29303BU can be used in automotive and automotive audio systems, in test benches and measuring systems, in any audio and video equipment, in VCO and SAW circuits, in power supplies for computer peripherals and sensors, and in MEMS and acoustical equipment.

The MIC29303BU is also suitable for applications in high-end consumer electronics, such as HDTVs, Blu-ray players, AV receivers, surround-sound systems, and GPS systems. It can be used in automotive and automotive audio systems, in test benches and measuring systems, in any audio and video equipment, in VCO and SAW circuits, in power supplies for computer peripherals and sensors, and in MEMS and acoustical equipment.

Working Principle of MIC29303BU

The main principle concept of MIC29303BU is to maintain a constant output voltage regardless of input voltage fluctuations and current demand. This voltage regulator consists of a pass transistor, an error amplifier, a voltage reference, and a comparator circuit. Its output voltage is controlled by two resistors, one is connected to the output, and the other is connected to the adjustment pin. The output voltage is set by selecting the resistance values of the two resistors.

The pass transistor is connected as a series emitter-follower. This type of topology isolates the load from the control circuit, ensuring that the output voltage remains constant regardless of the load current. The error amplifier compares the output voltage and the reference voltage and adjusts the pass transistor\'s base voltage and current accordingly. The reference voltage can be adjusted by pin 1 on the MIC29303BU.

The MIC29303BU maintains high efficiency even when the input voltage is low. It utilizes a switched-capacitor current regulator, which allows it to minimize quiescent current while achieving exceptional dynamic performance. In addition, the MIC29303BU can also be used with an open-loop voltage mode control system to ensure fast transient response without compromising accuracy.

The MIC29303BU is capable of operating over a wide range of temperatures and input voltages, making it suitable for use in a variety of applications. Additionally, it features over-current, over-voltage protection, as well as short-circuit protection, ensuring safe and reliable operation.

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