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MIC37151-1.8BR Application Field and Working Principle

Introduction to MIC37151-1.8BR

The MIC37151-1.8BR is a low dropout (LDO) voltage regulator designed by the Microchip Technology Inc., designed to provide a constant output voltage of 1.8V. It has a low quiescent current of 45µA, which makes it ideal for situations where low power consumption is required. The MIC37151-1.8BR is packaged in a compact 8-pin SOICN package and can operate over an input voltage range from 3.0V to 20V. It also supports power supply sequencing and track-and-hold operation.

MIC37151-1.8BR Application Field

The MIC37151-1.8BR is most commonly used in battery-powered devices, such as cellular phones, PDAs, and other portable devices. It is also used in automotive, industrial, and medical applications, where high reliability, low power consumption, and small package size are highly desirable. The MIC37151-1.8BR is also well suited for new designs that do not need an external power supply sequencing capability, due to its low quiescent current and internal power sequencing control.

MIC37151-1.8BR Working Principle

The MIC37151-1.8BR is a Low Dropout (LDO) linear voltage regulator. It uses an internal N-channel MOSFET as the pass transistor to regulate the current flow, which provides a low output impedance and excellent line and load regulation. The MIC37151-1.8BR also uses current and voltage feedback to maintain a constant output voltage, with the current feedback controlling the voltage during loading and the voltage feedback controlling the current during loading. The output voltage is adjusted using an external resistor divider, allowing for an adjustable output voltage range from 1.25V to 5.0V.

Advantages of MIC37151-1.8BR

The most important characteristics of the MIC37151-1.8BR are its low quiescent current, low voltage dropout, and low output impedance. The quiescent current of the MIC37151-1.8BR is 45µA, which is considerably lower than the typical LDO of 75µA. The low voltage dropout ensures that the output voltage stays close to the input voltage, even at low input voltage. The low output impedance ensures that the output voltage remains stable under varying load conditions. The MIC37151-1.8BR also offers power supply sequencing, track-and-hold operation, and an adjustable output voltage range from 1.25V to 5.0V.

Conclusion

The MIC37151-1.8BR is a low-voltage, low-dropout, and low-power linear voltage regulator, which is ideal for battery-powered and low-power applications. The internal N-channel MOSFET provides excellent line and load regulation, while the low quiescent current and power supply sequencing functions allows for efficient energy consumption. The adjustable output voltage range of 1.25V to 5.0V has made the MIC37151-1.8BR a popular and versatile choice for a wide range of applications.

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