BD4955FVE-TR

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PMIC - Supervisors

PMIC or Power Management Integration Circuits collectively integrate and manage low-level functions that are typically specific to a system such as power conversion, control, regulation and protection. Common to all power management solutions, the PMIC\'s role is to regulate and control how electricity is supplied to the system by ensuring voltage, current, and current-density specifications are met, while also acting an over-temperature watchdog. PMIC Supervisors are an integrated type of power management solutions, typically featuring advanced features such as Voltage supervisors, Analog Comparators, Watchdog timers, System Power Monitors and multiple fault management capabilities, to name a few.

The BD4955FVE-TR is a PMIC Supervisor from ROHM Semiconductor, featuring a power supply voltage supervisor, an autonomous voltage down-shift function, an over-current protective circuit and a watchdog timer. The device can be mounted on a multitude of systems from industrial machinery, consumer goods to vehicles and provides effective voltage protection, over-current protection and over-temperature protection.

Application Field

The BD4955FVE-TR is useful for any environmental conditions where it is necessary to ensure stable power supply and monitor the system temperatures. It is suitable for automotive applications such as gasoline injection ECUs, hybrid control modules, lighting and navigation systems, as well as industrial systems including air conditioners, electric power steering, solar power systems and CCTV cameras. The device also provides a system down-shift function that enables prevention of burnt-out due to external factors such as the unconnectability of a DCDC converter.

Working Principle

For maximum effectiveness, the built-in power suppression voltage of the device is regulated with a voltage supervisor circuit and an abundant protection circuit. Being capable of detecting over-voltage, undervoltage, over-current and over-temperature, the device controls the power supply and inhibits the power supply voltage when an abnormal voltage or current is detected. The challenge to this is its autonomous system down-shift function. In the event of backup power supply, the system down-shift function takes the error out of the abnormal situation automatically.

The BD4955FVE-TR features an analog comparator circuit that operates upon the comparison of 2 voltage signals that can be externally applied, either a reference voltage or a power supply voltage, allowing for more flexibility in system design. A high-accuracy internal reference voltage, a reference voltage that is adjustable up to 0.6 V, as well as a reference voltage externally adjustable up to 0.24 V allows for a variety of application specs. It also comprises of a multiple watchdog timer with a maximum time delay time of 4.09 seconds.

This device includes Reset Output, an output that pauses and then continues functioning no matter how busy the system is and No Reset Output, a forced recovery output that immediately recovers from abnormalities. The device also contains multiple detection circuits and an interrupt output, making it highly efficient and suitable for use in simple and cost effective power management designs in a variety of system applications.

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