BU4945FVE-TR

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Power Management Integrated Circuits (PMICs), also known as Supervisors, are essential components in almost all electronic systems. PMICs provide power to the other integrated circuits and also manage and monitor the power consumption of the system. BU4945FVE-TR is a PMIC Supervisors manufactured by ROHM Semiconductor that is designed for automotive applications. This article will discuss the application field and working principle of BU4945FVE-TR.

BU4945FVE-TR has a wide range of automotive applications. It is primarily used as a supervisor circuit that monitors the primary power supply and prevents system overload. It monitors the supply voltage, load current, temperature and other parameters to ensure system stability and protect the circuit from over-voltages and over-currents. Another application of BU4945FVE-TR is to provide power to the system in case of a power failure. This can be used in automotive applications such as engine control systems and intelligent lighting systems to prevent power outages.

BU4945FVE-TR features integration of a 5V LDO regulator and comparator with extended temperature range and overvoltage protection. This IC combines an LDO regulator and a comparator in a single package, reducing board space and improving system efficiency. Additionally, the chip\'s extended temperature range can switch between -40°C to +150°C, making it suitable for automotive applications.

The BU4945FVE-TR also utilizes a unique and innovative control method for supplying power to the system. It utilizes a three-step process for controlling the power output to the system. The first step is a voltage detection circuit which monitors the supply voltage and sends a signal to the micro-controller to indicate the supply voltage. The second step is a voltage comparator which compares the supplied voltage with a reference voltage. If the supplied voltage is higher than the reference voltage, the comparator sends a signal to the micro-controller to indicate the high supply voltage. The last step is the on-chip LDO regulator which can adjust the supply voltage to the desired level. This three-step process ensures that the system always receives the correct voltage, regardless of the supply voltage.

BU4945FVE-TR also offers Voltage Monitored Over Temperature Protection (VMOTP). This feature enables the IC to monitor the chip temperature and the temperature of the system. If the temperature reaches a certain threshold, the system will shut down and will not allow power to be supplied to the system until the temperature is stabilized. This feature ensures the safety of the system by shutting off the power supply when necessary.

In conclusion, the BU4945FVE-TR from ROHM Semiconductor is a PMIC Supervisor suitable for automotive applications. It is an integrated LDO regulator and comparator with extended temperature range and over-voltage protection. The chip uses a three-step process for controlling the power output and also has Voltage Monitored Over Temperature Protection (VMOTP) for temperature stability. This IC is a powerful and reliable monitoring and protection solution for automotive applications.

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