BD4851FVE-TR

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PMIC Supervisors are power management integrated circuit devices which provide voltage and current supervision or control in electronic systems. The BD4851FVE-TR is a high-performance 4-Channel supervisor IC with +1.8V to +5.5V operating voltage range. It monitors four power supplies that include system power supply, power supply input to various peripheral chips, and power supply to core logic. This article looks at the application field and working principle of the BD4851FVE-TR.

Applications of the BD4851FVE-TR Supervisor are highly varied. It is used for voltage and current monitoring and controlling in systems such as media players, e-book readers, portable navigation systems, ultra thin notebooks, automotive navigation systems, micro computers, and laptop PCs. It can be used to control power supply level of system components, detect power supply malfunctions, and protect key components from damage due to voltage or current overload. The BD4851FVE-TR Supervisor is also sometimes used as a cold start and wake-up circuit for sleep mode operations, as well as providing power reset signals for processor initialization.

The BD4851FVE-TR Supervisor is a low-input current type that operates over a wide voltage range of 1.8V to 5.5V. It continually monitors voltages and currents in various power sources and provides an output signal when an abnormality is detected, either in the form of a low-voltage or over-current. It also contains an improved timer to prevent false detection due to a noisy environment.

The BD4851FVE-TR Supervisor utilizes a 3-stage voltage sequence detector, a voltage monitor and a reset generation circuit. 3-stage voltage sequence detector function is used to monitor the presence or absence of system power supply, supplied power to a peripheral IC, and core logic power supply. It can detect even small voltage values of 0.25V or higher. It also provides a handy reference voltage at its dedicated output terminal as a power supply source when a third source is added to the system.

The voltage monitor of the BD4851FVE-TR Supervisor constantly monitors the system power supply voltage or voltage of the peripheral ICs. Upon detection of abnormality, it produces an appropriate output signal in a wide detection range of 1.8 ~ 5.5V and can detect even small voltage values down to several millivolts. It also monitors current according to detection range settings and produces a predetermined output signal upon detection of an abnormality.

The Reset Generation Circuit of the BD4851FVE-TR Supervisor generates Reset signals to reset processor upon detection of power supply abnormality. It contains reset signal output for the Supply Voltage Low Detection, High voltage Detection, and Low voltage Detection. This signal is applied to respective external process blocks upon detection of an abnormality, to reset their power supply in order to ensure their normal operation.

The BD4851FVE-TR Supervisor has various features that make it suitable for use in different power supply management and system reset operations. It can detect even small voltage values, monitor current in a wide range, and generate Reset signals to reset processor. It is also able to detect presence or absence of system power supply, supplied power to a peripheral IC, and core logic power supply. All these features increase its application in various systems. This makes the BD4851FVE-TR Supervisor one of the most sought after supervisors in the industry.

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