LP2951ACD

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LP2951ACD Application Field and Working Principle

LP2951ACD is a voltage regulator belonging to the category of linear PMIC - Voltage Regulators. It is an adjustable, low-noise and low-dropout voltage regulator that is built specifically for precision operations. It has a wide scope of application and is highly reliable, making it one of the most popular choice for engineers for many digital and analog applications.

Application Field

LP2951ACD can be used for powering many digital components, such as analog & digital circuitry and microcontrollers. It can also be used for controlling current swings and raising or dropping supply baseline voltages. A special feature included within the design of the LP2951ACD is its ability to maintain its noise blockers, even in the presence of several noise sources. It is highly efficient in interconnects, telecom, instrumentation and high frequency designs.

Components of LP2951ACD

LP2951ACD is composed of two operational amplifiers, two MOSFETs, a band-gap reference, and other components. The two MOSFETS are used to provide a small amount of current at the output, while the two operational amplifiers comprise a voltage doubler circuit, along with its associated components. This doubler circuit provides a high output voltage, while maintaining a low input voltage. The band gap reference influences the base-emitter voltage of the transistors.

Working Principle of LP2951ACD

The working of LP2951ACD revolves around the two MOSFETs and the two operational amplifiers. One of the MOSFET has its source and drain terminals connected, while the other has its gate connected to the output. The two operational amplifiers in turn are connected to the drain of the first MOSFET and the gate of the second MOSFET. In the absence of input voltage, the voltage at the gate of the MOSFETs would reach the switch-on threshold, allowing the current to flow through the MOSFETs. However, an input voltage will modulate the threshold voltage, thus allowing the LP2951ACD to maintain a desired output voltage.

When an input voltage is present, the two operational amplifiers compare the input and output voltages. If the two voltages are not equal, one of the amplifiers makes the output voltage at the gate of the MOSFETs higher, or lower, depending on the case. This in turn modulates the threshold voltage, and thus the output voltage is kept in check as required.

Conclusion

The LP2951ACD is a versatile and reliable linear PMIC - Voltage Regulator. It is composed of two MOSFETs and two operational amplifiers, and can be used to regulate and maintain a required output voltage with efficient noise filtering abilities. Its wide range of applications make it a highly sought after design for many signal processing circuits and digital systems.

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