MIC24421YML-TR

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This article focuses on the application field and working principle of the MIC24421YML-TR voltage regulator. It is classified as a PMIC (Power Management Integrated Circuit) Voltage Regulators DC DC Switching Controllers, and contains two operating modes (tail regulation and current regulation).

Introduction

The MIC24421YML-TR is a high performance, non-synchronous, adjustable DC-to-DC regulating controller manufactured by Micrel. It is an integrated circuit that can be used to regulate the output voltage of any power supply. The MIC24421YML-TR is designed to provide a designer with the flexibility and control they need to build complex voltage regulation circuits. It is typically used in applications such as system power supplies, microprocessor power supplies, motor drivers, and other power supplies where precision and efficient regulation is needed.

Application

The MIC24421YML-TR is an ideal voltage regulator for many types of applications, especially for mobile and automotive applications. It features low power consumption and wide operating temperature range of -40ºC to +125ºC, making it suitable for most automotive and industrial applications. Additionally, the MIC24421YML-TR has very low quiescent current and is capable of driving up to 10A of continuous output current.

The MIC24421YML-TR\'s low noise and voltage ripple can be used to effectively reduce EMI emissions for noise sensitive applications, such as medical and industrial machines, communications systems and other mission-critical applications. This feature, combined with its wide operating temperature range of -40ºC to +125ºC, makes the MIC24421YML-TR suitable for use in a variety of harsh environments.

Features and Benefits

The MIC24421YML-TR offers many advantages to its users. It is easy to use and offers high efficiency, low noise and low ripple output. It also provides short-circuit and over-current protection and is compliant with EN55022 Class B (CISPR 22) EMI requirements. Additionally, the MIC24421YML-TR\'s small package footprint saves space and makes it ideal for applications with limited real estate. The MIC24421YML-TR also features a built-in voltage dropout detector, eliminating the need for an external voltage sense resistor.

Other noteworthy features include a high frequency 1 MHz oscillator to allow for faster transient response, a low supply current of 1mA to support current limited regulator designs and a high immunity to output noise, making the MIC24421YML-TR suitable for low EMI applications. The MIC24421YML-TR also has a wide input voltage range of 4.5V to 28V ideal for systems that use a wide range of input voltages.

Working Principle

The MIC24421YML-TR is a voltage regulator controller that uses pulse width modulation (PWM) as its regulating principle. The PWM method works by rapidly switching the input voltage on and off to generate the required regulated output voltage. The MIC24421YML-TR contains two operating modes: tail regulation and current regulation. In tail regulation mode, the output voltage is regulated with a reference voltage, while in current regulation mode the output current is regulated with a reference current.

Within the MIC24421YML-TR there is a comparator used to compare the set point (either a reference voltage or current) and the monitored output voltage or current. The PWM signal is generated based on the comparison made. The PWM signal is then sent to the power switch, which will regulate the output voltage or current based on the signal it receives.

The MIC24421YML-TR also offers many features to further improve system efficiency and performance. It has a built-in soft-start and auto-restart feature, which prevents the output from overshooting during startup and allows for a controlled and reliable startup. Additionally, the MIC24421YML-TR also has overtemperature protection and a power good output to ensure system safety.

Conclusion

The MIC24421YML-TR switching regulator controller is a high performance, non-synchronous voltage regulating device. It is ideally suited for mobile and automotive applications and provides designers with high efficiency, low noise and low ripple output as well as various protection features. The MIC24421YML-TR uses a PWM method to generate the required regulated output voltage or current and offers two operating modes which can be selected based on the application.

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