A5975ADTR

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The A5975ADTR is a DC-DC switching regulator controller, and as a part of the PMIC voltage regulator family, it is specifically developed for use in reliable power systems. The main features of this regulator are high accuracy of output voltage, high-speed switching between two output voltages, and built-in temperature monitoring. This article outlines the application fields of the A5975ADTR and its working principle.

Application Field:

The A5975ADTR is suitable for a wide range of applications, including microprocessor, memory, and peripheral power supplies, as well as programmable logic and data converters. In particular, this regulator is ideal for embedded systems such as cellular phones, digital cameras, and other mobile devices. The A5975ADTR is also suitable for driving LEDs, and as such, is frequently used in low-power lighting systems.

Working Principle:

The controller uses an internal voltage regulator to monitor and control the output. When the power supply voltage is above the set point, the controller enables the MOSFET switches, which in turn allow current to flow from the input to the output, resulting in an output voltage that is a fixed ratio of the input voltage. The output voltage can be adjusted by varying the regulating voltage. Since the A5975ADTR is a low-side synchronous regulator, an input voltage greater than the output voltage is required.

When the power supply voltage is below the set point, the controller shuts off the MOSFET switches, which blocks the current flow and results in a stable output voltage. To ensure fast switching, the controller also includes a ramp generator circuit that ensures that the output voltage can be changed smoothly and quickly.

The A5975ADTR also contains a temperature monitoring circuit, which detects an excessive die temperature by comparing the die temperature with a preset temperature. When an excessive die temperature is detected, the controller shuts off the MOSFET switches and goes into a safe operation mode.

The A5975ADTR operates from a 3.3 to 5.5V power supply and has an operating temperature range of -40 to +85°C. The wide operating temperature range makes it suitable for use in extreme environmental conditions.

In short, the A5975ADTR is a highly efficient DC-DC switching regulator controller suitable for a wide range of applications, providing reliable and precise output voltage regulation at fast switching speeds. Its built-in temperature monitoring circuit ensures safe operation in extreme environments.

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