BU45K342G-TL Integrated Circuits (ICs)

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Type:	Voltage Detector
Number of Voltages Monitored:	1
Output:	Open Drain or Open Collector
Reset:	Active Low
Reset Timeout:	120 ms Minimum
Voltage - Threshold:	3.4V
Operating Temperature:	-40°C ~ 105°C (TA)
Mounting Type:	Surface Mount
Package / Case:	TO-236-3, SC-59, SOT-23-3
Supplier Device Package:	3-SSOP

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Introduction to PMIC Supervisors

Power management integrated circuits, or PMICs, are specialized ICs designed to manage the power supply of an entire system or several sub-systems within a larger system. This can include a range of tasks including voltage conversion, monitoring of system power, output current and voltage loading, power control, and energy-saving management. PMICs find use in a broad range of applications, including IoT devices, communications, embedded devices, and various home appliances.PMICs can be divided into multiple categories including Analog PMICs, Digital PMICs and Supervisors. Supervisors are further divided into Supervisor Chips and Supervisor ICs. Supervisor chips are simple circuits that detect a power-off or power-on signal from a system. Supervisor ICs are more sophisticated, offering additional features such as system reset detection and reset disable.

BU45K342G-TL Application Field and Working Principle

The BU45K342G-TL is a supervisor IC with overvoltage protection capabilities and access control for embedded systems. It is capable of monitoring two supply voltages, VDD and VSB, with a voltage range of 0.8V to 5.5V. It includes an over-voltage protection function that releases the system reset in the event of a voltage surge. Additionally, it has a locked access control function, which allows the user to lock and unlock the system’s reset port. This can be used to prevent other powerful external reset sources from accessing the system reset, ensuring that the system reset remains secure.The BU45K342G-TL has an operating temperature range of -40℃ to 85℃, making it suitable for a wide range of both residential and industrial applications. This IC also has a built-in watchdog timer (WDT) and has a time-out period of approximately 64 ms. This allows for reset to occur in the event that a system locks up for any reason.In terms of its working principle, the BU45K342G-TL has two output states. The first is a reset output, which is activated when the monitored voltage reaches below the set voltage, e.g. 3.1V. The second is an output enable signal, which is enabled when the monitored voltage exceeds the set voltage, e.g. 3.3V. This enable signal can then be used to enable/disable peripherals and modules as needed.

Conclusion

The BU45K342G-TL is a supervisor IC ideal for embedded system designs. It features overvoltage protection, access control and a watchdog timer, all of which are essential features of a reliable power supply design. Its wide operating temperature range and multiple output states make the BU45K342G-TL well-suited for a range of applications.

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