BD4847FVE-TR

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A Power Management Integrated Circuit (PMIC) is a device containing integrated circuits which make up a complete system suitable for executing various tasks related to power management. One such device is the BD4847FVE-TR, a voltage supervisor with two independent outputs and two independent thresholds.

The BD4847FVE-TR belongs to the PMIC Supervisors category, whose components are suitable for various monitoring tasks such as voltage and current monitoring, over-temperature control, threshold detection, and fail-safe reset. By integrating the required level of monitoring circuitry with a microcontroller, the BD4847FVE-TR provides a single-chip solution for power management needs.

This particular PMIC is capable of detecting and placing into a definite state risks such as over-voltage, long inrush current, over-temperature, and high/low-battery input. The device can be used to perform diagnostic checks or trigger a reset or power-off, triggering fixed-timed reset, or simply indicating the presence of any number of the risk conditions.

BD4847FVE-TR Application Field

This PMIC is widely used in various consumer, automotive, and industrial applications due to its versatility and reliability. In consumer applications such as smartphones, tablets, and medical devices, the BD4847FVE-TR can be used to provide power sequencing and to protect the system from errant over-voltage, over-current, or hot box events. Automotive applications, such as in car audio systems, also benefit from the BD4847FVE-TR’s ability to protect against over-voltage and over-current conditions. In industrial applications, such as factory automation systems, with their large number of connected devices, the BD4847FVE-TR is able to provide reliable power sequencing and fail-safe reset.

BD4847FVE-TR Working Principle

The BD4847FVE-TR includes two independent voltage supervisors: a high voltage supervisor and a low voltage supervisor. Each supervisor has two independent thresholds which can be adjusted independently, allowing detection of multiple risks with a single device. The overhead also includes a bypassing pin, an internal voltage reference, and an external resistor to set the operating thresholds. The device operates in one of two states: either “normal” or “error”.

In normal operation the thresholds are set to monitor for the preselected “risk” conditions. If, for example, the low voltage supervisor detects voltage below its threshold, then the internal, adjustable, error output pin is switched. This interaction is supported by an internal oscillator with a wide frequency range, assuring a reliable operation even when the external environment noise is loud and disruptive. The error pin stays in this state until the reset pin is activated by a reset circuit, or manually. The high voltage supervisor operates in the same way, but its threshold is used to detect and respond to high voltage signals.

In addition, the device includes an adjustable timer, which allows the user to select the duration of the error monitoring cycle. This functionality is important in order to protect against conditions such as inrush current, which may overload the system, but should not cause permanent damage. The timer allows the BD4847FVE-TR to temporarily reset the system in these cases, allowing the system to continue operating without damage.

Conclusion

In summary, the BD4847FVE-TR is a versatile power management IC designed for use in a wide variety of consumer, automotive, and industrial applications. Its two independent threshold detectors can be used to monitor for a range of risk conditions such as over-voltage and over-current, and its adjustable timer ensures protection from inrush current that may otherwise cause system damage. The BD4847FVE-TR is thus an effective and reliable way to provide fail-safe reset and power sequencing.

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