MIC2211-FNBML-TR

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The MIC2211-FNBML-TR is a 3-terminal adjustable 1.2A low-dropout linear voltage regulator. This device was designed specifically to provide very low dropout voltage and high output accuracy over a wide range of load currents. It utilizes a MOSFET pass device to achieve a maximum dropout voltage of 115mV at a current draw of 1.2A, making it well suitable for applications that require linear voltage regulation, low power dissipation and a low dropout voltage.

The MIC2211-FNBML-TR voltage regulator features an external trim to adjust the output voltage to the desired value. It achieves precision within +-1% at a temperature of 25 C and a maximum of +-2% over the entire temperature range. It also offers excellent stability during load and line transients with no external requirements, making it an ideal choice for telecom, industrial and portable system applications.In addition, the MIC2211-FNBML-TR has low ground current, low noise and fast response to load transients due to its very high transistor gain. The device has a wide operating temperature range of -40 C to +125 C, making it suitable for a variety of applications.

In general, the MIC2211-FNBML-TR voltage regulator can be used in a wide range of applications such as supplying the processor core voltage in microprocessors, computer systems and other embedded systems. It can also be used as a low dropout (LDO) regulator in low-power analog/mixed-signal applications such as LCD monitors, cellular phones, solid-state lighting and automotive systems. The MIC2211-FNBML-TR is also used in networking and communications systems, computing platforms, disk drives, fan controls, etc.

Working principle

The MIC2211-FNBML-TR is a type of low-dropout linear voltage regulator, which means it regulates the output voltage by controlling a series of resistors. It utilizes a MOSFET pass device with a typical output resistance of about 10 ohms, allowing it to achieve a maximum dropout voltage of 115mV at a current draw of 1.2A. When this voltage regulator is turned on, the high-side MOSFET of the device, driven by the high-side driver, connects the resistor network between the input voltage and the output capacitor. This resistor network is used to set the output voltage. When the output voltage varies, the duty cycle of the low-side driver is changed to adjust the resistor network value and keep the output voltage stable. If the output voltage drops, the duty cycle of the low-side driver increases and the network value decreases, thus restoring the output voltage to its desired level. The same process occurs if the output voltage increases, and the duty cycle of the low-side driver decreases and the network value increases, thus again restoring the output voltage to its desired level.

The MIC2211-FNBML-TR voltage regulator also features a soft-start function that helps protect the load by limiting the inrush current when the regulator first comes on. This feature helps the device and load to remain in steady-state operation and prevents possible damage due to high surge current. The MIC2211-FNBML-TR also features an over-temperature protection (OTP) function to protect the device from excessive operation and prevent any damages. If the device temperature rises above the maximum set point, the device will shut down and protect itself from further damage. This feature helps reduce the risk of damage to critical components such as processors and memories.

Conclusion

The MIC2211-FNBML-TR voltage regulator is a low-dropout, adjustable linear voltage regulator that offers high output accuracy, excellent stability during load and line transients, and low noise. It is well suited for a wide range of applications such as processor core voltage regulation and low-power analog/mixed-signal applications. It has been designed with advanced features like soft-start, over-temperature, and over-current protection to ensure safe, reliable, and efficient operation in demanding applications.

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