LD49300PT08R

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LD49300PT08R Application Field and Working Principle

The LD49300PT08R is a linear voltage regulator from STMicroelectronics and belongs to their LD49XXX family. It belongs to the PMIC (Power Management Integrated Circuit) category, specifically within the Voltage Regulators subsection. This voltage regulator offers protection against over- and under-voltage conditions, as well as against output over-temperature conditions. It is suitable for a 3.3V fixed regulation and it is designed to work with input voltages of up to 12V.

This regulator is intended for use in industrial and automotive applications, to include electrical, electronic, and battery powered systems. Some of its typical applications include power conversion and battery management, battery chargers and converters, as well as voltage stabilization.

The LD49300PT08R has two operational modes. The first one is the “static” mode, and helps regulate the output voltage in static conditions or with low load currents. The other one is the “dynamic” mode, and helps regulate the output voltage and counter any conditions of load current fluctuation. The LD49300PT08R also has a “protection” mode designed specifically to protect the regulator’s components against thermal runaway.

The output voltage on this voltage regulator is user-programmable, meaning it can be adjusted to a desired value between 3V and 3.3V. It has many other features, including an adjustable soft-start time, adjustable over-temperature and over-current protection, adjustable fast turn-on, and more.

The LD49300PT08R voltage regulator works by controlling the amount of current passing through the device by means of a power MOSFET in series between the input and output. When the applied voltage is greater than the output voltage, then the power MOSFET is turned on and allows current to flow through the device, and in turn regulate the output voltage. Similarly, when the applied voltage is lesser than the output voltage, the power MOSFET is turned off and thereby restricts the amount of current passing through the device and maintains the desired output voltage.

In addition to the adjustment of the output voltage, the LD49300PT08R provides two modes of control, which takes place over two ranges of load current. In the static mode, the voltage regulator helps without any disturbance to the input or output pins. In the dynamic mode, the phase-shift controller helps to reduce in-rush current and also maintains a good output voltage regulation with low transient voltage and resistive load conditions.

The LD49300PT08R linear voltage regulator also offers over-temperature protection in the form of a thermal shutdown feature. This feature is activated whenever the temperature of the voltage regulator exceeds the specified level, and helps to keep the regulator from overheating. The linear voltage regulator also offers adjustable over-voltage and under-voltage protection that helps protect the system in the case of either a power spike or decline.

In addition to the aforementioned features, the LD49300PT08R voltage regulator also offers an active-low and active-high output enable pin, which helps control the output voltage. Moreover, the device also offers a clock synchronization control and a manual reset function to help ensure a stable operation.

In conclusion, the LD49300PT08R linear voltage regulator is designed to be a reliable and feature-packed voltage regulator. It is designed for use in industrial and automotive applications and offers features such as adjustable output voltage, over-temperature protection, over-current protection, and adjustable soft-start time. It has two operational modes, a “static” mode and a “dynamic” mode, and helps regulate the output voltage against load current fluctuation. Its adjustable over-voltage and under-voltage protection helps protect the system from dangerous power spikes and declines.

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