BD45431G-TR

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The BD45431G-TR is a power management integrated circuit (PMIC) for supervisors specifically designed for the automotive industry. It consists of a number of functional blocks, such as a power surveillance engine, a reset circuit, and two brownout detectors. It is designed to monitor the system power supply voltage, and to provide an active reset to the host controller when the power rail voltage drops below a certain voltage. Additionally, it provides two independent brownout reset circuits, which can be used to reset peripheral devices as well as the host system.

Application Field:

The BD45431G-TR is specifically designed for automotive applications, such as engine control and core management. It is capable of monitoring multiple power rails and responding to voltage drops and signal failures. Additionally, it can be used in applications where reliable power monitoring and reset circuits are required, such as industrial and medical systems. Its automotive-grade components provide stable power and temperature characteristics, making it an ideal choice for critical applications.

Working Principle:

The power surveillance engine is the core component of the BD45431G-TR. It continuously monitors the system power rail voltage and produces an active reset signal when the voltage drops below the trigger voltage. Additionally, a precision voltage reference is employed to provide accurate voltage comparison. The reset signal is passed through an OR gate to the host controller and peripheral devices.

The two independent brownout reset circuits are designed to provide reset signals when the power rail voltage drops below a certain threshold. Each circuit has two comparators with programmable reference voltages and two hysteresis bits, which can be used to increase noise immunity. Both circuits are OR’ed together and then fed to an active-high reset output port. This output can be used to reset the host or peripheral devices.

The BD45431G-TR also has several other features, such as an integrated watchdog timer, power-on reset, and voltage-lockout mechanism. The watchdog timer can be used to reset the system periodically, while the power-on reset ensures the system is properly initialized after power is applied. The voltage-lockout mechanism prevents the system from being powered up if the input voltage is too high. All of these features make the BD45431G-TR an ideal solution for automotive power supply monitoring applications.

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