LM22680MR-ADJ/NOPB

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LM22680MR-ADJ/NOPB Application Field and Working Principle

The step-down switching regulator LM22680MR-ADJ/NOPB is a high-efficiency current-mode switcher with power management integrated circuit (PMIC) from Texas Instruments. This integrated circuit is designed for point-of-load (POL) applications and has a wide range of regulation and voltage options. It is an ideal choice for applications that require increased efficiency and the need to convert a large input voltage range to a desired output voltage. This device is capable of providing excellent transient performance in either continuous conduction mode (CCM) or discontinuous conduction mode (DCM).

Application Field

The LM22680MR-ADJ/NOPB is used in many applications such as automotive, communication, industrial and consumer applications. It is suitable for medium- to high-power applications such as power amplifiers, power supplies, motor control systems, battery chargers and other applications requiring monolithic integrated DC-DC conversion. The LM22680MR-ADJ/NOPB is compatible with dual and single-ended output voltage regulation implementations. This regulator can achieve a very wide range of output voltages from 1 V to 8 V and provides excellent efficiency at the same time. In addition, the device can be used in applications spanning from 0.7 V to 12 V, making it suitable for many different types of applications.

Working Principle

The LM22680MR-ADJ/NOPB is a current-mode switcher. It uses a constant-frequency current-mode control architecture to regulate its output voltage. This means that the device regulates the output voltage by monitoring and controlling the current flowing through its inductor. The device uses a variable frequency control to ensure that the switching frequency remains within a predetermined range to optimize efficiency and reduce EMI emissions. Its current-mode switching provides accurate output voltage regulation, fast transient response, and excellent line and load regulation.

The device also features two analog control loops, the current loop and the voltage loop. The voltage loop is the primary loop responsible for setting the output voltage with its on-chip reference. The current loop is used to keep the switch current constant by adjusting the ON-time of the switch which ultimately sets the output voltage. The voltage loop feeds into the current loop and is used as an additional control module to further regulate the output voltage based on the reference voltage.

The device offers a number of additional features such as soft-start, short-circuit protection, over-voltage and over-current protection, propagate delay, skip cycle and clock out. These features increase the functionality of the device and make it more suitable for advanced applications. Furthermore, it features frequency synchronization, allowing two or more LM22680MR ADJ/NOPB\'s to be synchronized together for improved efficiency. The device is also capable of performing auto-restart and frequency foldback, ensuring that the regulation is maintained even in the case of overload.

Conclusion

The LM22680MR-ADJ/NOPB from Texas Instruments is a high-efficiency current-mode switcher with PMIC designed for point-of-load (POL) applications. This regulator is capable of providing excellent transient performance in either continuous conduction mode (CCM) or discontinuous conduction mode (DCM). It is suited for medium- to high-power applications and has a wide range of operating voltages ranging from 0.7 to 12V. The device features current-mode switching, analog control loops, a variety of features such as soft-start, short-circuit protection, over-voltage and over-current protection, and frequency synchronization. These features make the LM22680MR-ADJ/NOPB an ideal choice for many applications that require increased efficiency and the need to convert a large input voltage range to a desired output voltage.

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