MIC23451-AAAYFL-T5

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Power management integrated circuits (PMICs) are extremely versatile, applying both analog and digital control functions to supply reliable and efficient electrical power. In particular, PMICs are excellent at providing voltage regulation, often in the form of DC-DC switch mode regulators. Micrel\'s MIC23451-AAAYFL-T5 is among one of the most robust and advanced of such DC-DC switch mode regulator solutions. Layered with features and serving the most demanding of applications, this IC is the smart choice for many designs, requiring only a few auxiliaries for full operation, and offering adjustable output over a wide potential range.

Specifications

The MIC23451-AAAYFL-T5 component is a power management integrated circuit (PMIC) in the form of a high efficiency, monolithic synchronous step-down converter. It has a wide input range of 4.25V to 18V and a wide adjustable output range of 0.6V to 12V. Its integrated synchronous power MOSFETs save board space and component costs, and also help boost the overall efficiency of the system. Regulation, ripple and transients are also excellent. In addition, it includes a precise voltage reference, enabling output voltage accuracy to be adjust to within +/-3%. The IC offers dynamic voltage scaling, so that the output voltage can be dynamically and quickly adjusted in response to changing workloads without affecting the system\'s operation. Furthermore, it also offers a low standby power mode and input power sequencing, both of which help improve efficiency.

Features and Benefits

At the heart of the MIC23451-AAAYFL-T5 PMIC is a high efficiency monolithic synchronous buck switcher. It is capable of providing up to 2A of output current and is designed to deliver full load efficiency of up to 96%. This makes it especially suitable for applications that require low standby power draw such as battery-operated and portable devices. In systems where the load varies over time, the MIC23451-AAAYFL-T5 offers adaptive voltage scaling, enabling the output voltage to be dynamically changed in response to varying loads without affecting system performance.

The MIC23451-AAAYFL-T5 PMIC also features a built-in voltage reference which enables the output voltage to be adjusted to within +/-3%. This provides better system power efficiency and stability. In addition, the IC also offers low input power sequencing, which helps preserve the life of the system\'s batteries by delaying power-up of devices with high demands until after those with lower demands have been powered up. Finally, in order to maximize efficiency, the IC includes a low-phase-noise internal oscillator and uses digital soft-start to prevent overshooting during start up.

Applications

The MIC23451-AAAYFL-T5 PMIC is suitable for a wide range of applications where efficient voltage regulation is required. It is often used to power portable devices such as laptop computers, portable media players and cell phones. It is also commonly used in automotive applications and in high-precision industrial systems where stable and accurate output voltages are required. In addition, it can also be used to power battery-powered systems where low standby power consumption is highly desirable.

Working Principle

The working principle of the MIC23451-AAAYFL-T5 PMIC is based on the buck switching voltage regulator topology. It uses a low-side MOSFET, a high-side MOSFET and an inductor to step down the input voltage to a regulated and adjustable output voltage. As the input voltage increases, the MOSFETs are alternately turned on and off at a rate determined by an internal oscillator. During the on time, the current is stored in the inductor, generating a magnetic field. During the off time, the magnetic field collapses and the inductor current flows to the output, providing a regulated output voltage at a level determined by an internal voltage reference and error amplifier.

The MIC23451-AAAYFL-T5 PMIC also supports dynamic voltage scaling, which enables the output voltage to be changed in response to varying loads. In addition, it also offers input power sequencing and low standby power, both of which enhance system performance and efficiency.

Conclusion

The MIC23451-AAAYFL-T5 is an excellent power management integrated circuit for applications requiring efficient voltage regulation. It offers a wide input and adjustable output range, low standby power, input power sequencing and dynamic voltage scaling, as well as a precise internal voltage reference. It is suitable for a wide range of applications, from portable devices to high-precision industrial systems, and offers excellent power efficiency and stability. With its low component count and ease of use, it is an ideal solution for many designs.

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