LM2647MTC/NOPB

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LM2647MTC/NOPB Application Field and Working Principle

The LM2647MTC/NOPB is a synchronous step-down DC-DC converter dedicated to lower power applications. It is a part of the TI voltage regulators, and belongs to the group of DC DC Switching Controllers. This LM2647MTC offers an attractive solution for applications such as portable products, embedded systems and general-purpose designs running from a single-voltage supply.

Features

The LM2647MTC offers a range of features that make it an attractive choice for many applications. Firstly, it has a high peak current of 1.5 A together with an adjustable switching frequency up to 1.2 MHz. The LM2647MTC also has a shutdown current of 0.6 µA, which is much lower compared to other controllers in the same series. Additionally, it features other features such as a soft-start, logic-controlled shutdown, small-signal loop compensation, and internal clock synchronization.

Application Field

The LM2647MTC is suitable for low voltage applications running from a single-voltage supply. It is ideal for powering low-power system such as displays, RF and memory chips. More specifically, this DC-DC converter is suitable for applications such as portable products, embedded systems and general-purpose designs.

Working Principle

The LM2647MTC/NOPB provides a synchronous step-down DC-DC converter solution. It uses an inductor and a series of capacitors, with the voltage difference between the input and output terminals is regulated using a hysteretic control architecture.This hysteretic control is based on a fixed-frequency current-mode PWM control. The PWM input signal is compared with the voltage-feedback signal to generate an output pulse-width modulation signal. By adjusting the switching frequency, the system can be optimized for performance and efficiency.

The LM2647MTC/NOPB can be used to provide a step-down voltage from a high input voltage to an output voltage as low as 0.7 V. The output voltage can be adjusted by varying the resistor values for the feedback voltage divider. It can also be used for buck-boost conversion, allowing the input and output voltages to exceed the linear regulation limit.

Components

The LM2647MTC/NOPB requires several external components including an inductor, capacitor, voltage divider and several additional components. The inductor is used to store energy during the switching events, while the capacitor is used to smooth the incoming changes in the input voltage. The voltage divider is used to set the output voltage by dividing the input voltage. The additional components include resistors, electrolytic capacitors, Schottky diodes, and more.

Advantages

The LM2647MTC/NOPB is a low power application dedicated switch mode DC-DC converter. It has a peak current of 1.5 A and adjustable switching frequency up to 1.2 MHz. The device offers protection against overload, output short-circuit, and undervoltage conditions. Additionally, it offers low shutdown current of 0.6 µA, small signal loop compensation and logic-controlled shutdown.

Conclusion

The LM2647MTC/NOPB is a great choice for applications requiring a synchronous step-down DC-DC converter. It is suitable for low voltage applications running from a single-voltage supply and features a high peak current of 1.5 A with adjustable switching frequency up to 1.2 MHz. Additionally, it offers low shutdown current of 0.6 µA and a range of other features. With its advantages and features, the LM2647MTC/NOPB is an attractive choice for many applications.

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