MIC5237-3.3BU

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Mic5237-3.3BU Application Field and Working Principle

Introduction

The Mic5237-3.3BU is an adjustable linear regulator in a surface-mount, low dropout package that is produced by Micrel, Inc. It was designed as a robust, low-noise, ultra-low-dropout regulator to meet a wide variety of voltage requirements. This linear regulator features a current limited output, low dropout voltage, on-chip temperature protection and low-noise operation.

Application Field

This 3.3V linear regulator can be used in various applications, such as notebook and desktop PCs, consumer and industrial electronics, industrial and consumer electricity supplies, and control systems. It can also be used in a variety of other electronic applications where low noise, stability and reliability are required.

Features

• Maximum output current of 1.2A
• Low dropout voltage of 120mV at 1.2A output current
• Input voltage range from 2.0V to 5.25V
• Output voltage adjustable from 0.6V to 3.3V
• On-chip temperature protection with thermal shutdown
• Low-noise operation
• High accuracy of +/-0.3% at 25°C
• Shutdown mode reduces average supply current to less than 1uA when enabled

Working Principle

The Mic5237-3.3BU is an adjustable linear regulator, commonly known as a low dropout (LDO) regulator. It works by using a voltage reference to set the output voltage and a series of FET switches to provide a load sharing mechanism. The FET switches also prevent an excess of current from flowing through the regulator, when the input voltage dips.

The voltage reference from the Mic5237-3.3BU can be adjusted by a single external resistor, which sets the output voltage. A capacitor is connected to the output of the regulator to provide stability and reduce the voltage ripple. A thermal shutoff feature is incorporated into the regulator design to protect the internal components if the die temperature exceeds 150°C.

The regulator is designed to operate with low dropout voltages, which allows it to achieve high efficiency over a wide input voltage range. The low-noise operation is essential in many applications, as noise can interfere with the operation of the system.

Conclusion

The Mic5237-3.3BU is an adjustable linear regulator produced by Micrel, Inc. It was designed to meet a broad range of voltage requirements, including low-noise operation, current limitation, and low dropout voltage. The regulator operates via a voltage reference and a series of FET switches, and the output voltage can be adjusted with an external resistor. It provides high efficiency and stability over a wide input voltage range, and is suitable for a variety of applications that require low-noise operation, stability, and reliability.

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