LT8619EDD#TRPBF

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Voltage Regulators are a key part of any electronic application and are responsible for maintaining a constant or regulated supply of power to electronic components. LT8619EDD#TRPBF is one of the DC DC Switching Regulators from Linear Technology that offers a range of features necessary for the highest efficiency and reliability. This application note will provide an overview of the application field and working principle of the LT8619EDD#TRPBF.

Application Field of LT8619EDD#TRPBF

The LT8619EDD#TRPBF is a monolithic synchronous step-down switching regulator with programmable 3.3V and 5V fixed-frequency outputs. It is designed with Linear Technology\'s high-speed current-mode architecture, allowing efficient and stable operation at a wide range of output currents. It is suitable for powering low-voltage logic, memory and microprocessor circuits used in desktop, workstation and server applications.

The LT8619EDD#TRPBF integrates a 2A high-side N-channel Power MOSFET and an LDO regulator with an adjustable output voltage. It provides current mode control with a wide range of programmable features, including adjustable pulse-width-modulated (PWM) frequency, differential remote sense, output voltage trim and foldback current limiting. An enable control pin allows powering down the device. It also provides protection against over-temperature, over-voltage and undervoltage conditions.

Working Principle of LT8619EDD#TRPBF

The LT8619EDD#TRPBF operates on a principle of synchronous buck switching regulator, in which switching transistors are used to transfer energy from a higher voltage source to a lower voltage load, with a switchable feedback control for maintaining the output voltage within close limits. The device uses an advanced current-mode control scheme, which maintains a tight voltage regulation tolerance over a wide range of load currents, input voltages and operating temperature.

At first the device determines the input voltage and current, adjusts the switching frequency and duty cycle accordingly and then performs current mode control. It accurately regulates the output voltage by switching a high-side N-channel MOSFET that is incorporated in the device. This switch is turned on or off according to the cycle defined by the switching frequency. This continuous on/off switching creates a train of pulses, which then regulates the voltage. The device has an adjustable feedback network, which compares the output voltage to the internal reference voltage, and the error amplifier for varying the duty cycle of the switch and thus controlling the output voltage.

The LT8619EDD#TRPBF also provides programmable features such as adjustable PWM frequency, output voltage trim, and foldback current limiting. This feature allows the user to tailor the performance of the device to the specific application. All these features make the LT8619EDD#TRPBF a great choice for efficient and high-performance voltage regulation.

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