ISL6549CRZ-T

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ISL6549CRZ-T Application Field and Working Principle

ISL6549CRZ-T belongs to the class of PMIC (Power Management ICs) voltage regulators. It is a linear-switching PMIC voltage regulator commonly used in digital circuits. It combines both switching and linear operating modes and act as either a buck converter or a linear regulator, depending on the need for higher efficiency or lower noise. It simplifies the design of power supplies by using a single regulator chip with two operation modes to provide a complete power management solution.

The ISL6549CRZ-T is a low voltage regulator with a variable output voltage from 0.25V to 4.75V, and a maximum current of 2.5A. The switching mode uses pulse-width modulation (PWM) to supply the output voltage and current, whereas the linear regulator uses constant voltage regulation and current limiting. It has many features like low dropout operation, wide input voltage range, multi-mode/multi-voltage operation, active current limiter, shutdown feature, and over-voltage and over-current protections. It is also have a built-in thermal shutdown protection to prevent system damage caused by overheating.

The ISL6549CRZ-T is suitable for many applications like digital and stackable power supplies, low power processors, PDAs and other mobile equipment, and embedded systems. It is also employed in motor control, instrumentation and displays, ICs and memory cards, and others.

The working principle of the ISL6549CRZ-T depends on whether it is operating in the switching mode or linear mode. In the switching mode, an internal current-mode PWM controller is used to regulate the output voltage. The pulse width modulation (PWM) converter is controlled by a reference voltage that can be adjusted via the On/Off terminal. The converter switches ON for the required duration to regulate the output voltage to the reference voltage. The output voltage can also be preset using an external resistor network.

In the linear mode, the internal linear regulator varies the output voltage in response to changes in the load or input voltage. It controls the output voltage by varying the amount of current being drawn from the input supply. The linear regulator uses a current-limit comparator, binary divider and external resistor network to determine the output voltage adjustment.

The ISL6549CRZ-T can be used for low power digital systems applications due its high degree of controllability, wide range of output voltage and current, high efficiency and low noise. Its two operating modes enable an optimal solution for every power supply problem. It also offers benefits due to its flexibility and ease of use, making it ideal for many applications.

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