BD4900FM-E2

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The BD4900FM-E2 is a specialized linear voltage regulator chip designed to provide accurate and stable power to automotive applications. As a PMIC (Power Management Integrated Circuit) from a family of specialized linear voltage regulators, the BD4900FM-E2 provides optimal power efficiency and integrated system protection through unique features such as a built-in temperature monitor and an integrated system control logic. It is designed to meet the growing demand for automotive quality regulators and is capable of handling high current loads with minimal losses.

Applications

The BD4900FM-E2 device is well suited for automotive electronics applications, including steering, braking, headlights and engine controllers, with the ability to provide the visible and invisible power needed for these tasks. It is an ideal choice for providing adjustable voltage or current with fast response and high accuracy for various stress management applications, including power supplies, lighting systems and general purpose automotive circuits. It can also be utilized for non-automotive applications such as industrial, military and aerospace electronics for power supplies and motor control.

Working Principle

The BD4900FM-E2 features a linear regulator architecture and utilizes a P-channel MOSFET as the power pass device. The output voltage is set by an external voltage divider and can be adjusted with an external voltage sense pin. The chip also has a power logic monitor that monitors the input and output voltages and shuts down the device if the system is out of regulation. The BD4900FM-E2 integrates overvoltage protection and dynamic voltage scaling capabilities to provide automotive protection against overvoltage and current transients, ensuring the system is always stable and safe.

The BD4900FM-E2 includes two current feedback loops to enhance the line, load and thermal regulation of the output voltage. The first is a digital loop which monitors the output voltage and adjusts it to maintain regulation. The second, an analog loop monitors the power dissipation of the device itself and adjusts the output voltage accordingly for improved line regulation and low noise operation. This feature not only provides improved regulation but also allows the device to power on a load with minimum component count. Lastly, the chip features thermal shutdown to protect the system from thermal overload and temperature spikes.

Conclusion

The BD4900FM-E2 is an ideal choice for applications that require accurate and stable power with the added bonus of integrated system protection and overvoltage protection. With the ability to adjust output voltage, current or a combination of both, this chip is suitable for a wide range of automotive, industrial and aerospace applications. It offers enhanced system protection while providing improved noise and line regulation leading to improved overall system performance.

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