BU4944F-TR

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Type:	Simple Reset/Power-On Reset
Number of Voltages Monitored:	1
Output:	Push-Pull, Totem Pole
Reset:	Active High/Active Low
Reset Timeout:	--
Voltage - Threshold:	4.4V
Operating Temperature:	-40°C ~ 125°C (TA)
Mounting Type:	Surface Mount
Package / Case:	SC-82
Supplier Device Package:	4-SOP
Base Part Number:	BU4944

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PMIC Supervisors are integrated circuits that monitor the performance of a system and react when a change in voltage or current is detected. Some of these circuits are used in embedded systems to provide feedback to the controlling processor when changes in system power occur. The BU4944F-TR is one such PMIC supervisor, and will be explored in this article, with discussions on its application field and working principle. The BU4944F-TR is a low voltage reset IC that can be used in a variety of embedded systems, such as those used in industrial and automotive applications. It has two voltage outputs; an input voltage over 15V, and one output to indicate a reset condition. When the input voltage exceeds 15V, the output will go high and remain high until the voltage drops back below 15V.The BU4944F-TR is designed to prevent unexpected results when a system experiences a voltage overshoot or undershoot,l and it works by detecting changes in the power supply voltage and then notifying the controlling processor of the change. When the voltage goes high, the chip will issue an alert signal, allowing the processor to take corrective action. The chip also has an open-drain type reset pin, which allows the reset signal to be issued to the rest of the system. The BU4944F-TR will detect changes in the voltage over or under a predetermined threshold, and then issue an alert signal or reset signal as necessary. It does this using a hysteresis circuit, which is essentially a comparator with a time delay. When the voltage increases above a certain threshold, the comparator will detect it, and then actuate the reset signal accordingly. Similarly, when the voltage decreases below the threshold, the comparator will detect it, and then actuate the reset signal. The particular features of the BU4944F-TR can be broken down into the following: • Low voltage detector (15V) • Two output alert pins – High/Low • Input voltage range of 2.6V to 15V • Open Collector output • Hysteresis design • High accuracy trimming • Low power dissipation • Low standby current • Operating temperature range of -40 to +85 degrees Celsius • Operating voltage range of 2.6V to 15V The BU4944F-TR uses the hysteresis circuit design to detect change in the power supply voltage. This allows the chip to react quickly and accurately to changes in the voltage, and alert the processor accordingly. It also assists with resetting the system when a voltage undershoot occurs, ensuring that the system is returned to a stable state. The design of the hysteresis circuit within the BU4944F-TR allows for accurate trimming of the voltage threshold. This means that the allowable voltage ranges can be accurately measured and adjusted, meaning the system is not subject to incorrect reset signals, which would cause unexpected system behaviour.In conclusion, the BU4944F-TR is a low voltage reset IC suitable for use in embedded systems, such as those used in industrial and automotive applications. It is able to monitor the power supply voltage for both changes in over and undershoot, and can then alert or reset the system accordingly. The hysteresis circuit design within the chip ensures the system reacts quickly, and the trimming ability ensures accuracy when setting the voltage threshold.

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