BU45K252G-TL Integrated Circuits (ICs)

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The BU45K252G-TL is an integrated circuit that integrates multiple fixed/programmable voltage regulation functions in a single device, categorizing it as a Power Management Integrated Circuit (PMIC). The BU45K252G-TL is an important member of the Supervisors suite of power management solutions, which provides over-voltage and over-current protection, as well as positive and negative voltage monitoring and the ability to shut down the supply in the case of abnormal conditions. With an adjustable control loop bandwidth of 0.55Hz~10kHz, the BU45K252G-TL allows designers to adapt the regulation parameters according to system design requirements, such as line regulation and load transient response.

The BU45K252G-TL integrates a band gap voltage reference and a precision voltage comparator to lower overall system cost and improve system reliability. The BU45K252G-TL is designed and optimized for low quiescent current and low noise operation, making it ideal for portable applications such as notebook computers, digital cameras and cell phones. In addition, the BU45K252G-TL offers integrated ESD protection to better protect the system against electrical over stresses. The device also features an adjustable voltage reset delay time and adjustable supply under-voltage lockout.

The BU45K252G-TL is a voltage supervisor with very low power consumption. It consumes only 15µA in stand-by mode. It features a dynamic on-chip reset timer driven by an internal oscillator with an adjustable frequency range of 0.55Hz to 10kHz. The active output is capable of sourcing up to 10mA of current, making it suitable for driving external logic circuits. The device offers a wide input voltage supply range of 1.6V to 6V, and the reset output is capable of holding its active state with power supply under the minimum voltage limit of 1V.

The BU45K252G-TL offers a variety of applications including: over-voltage and over-current protection circuits, electronic circuit synchronization, low-voltage monitoring, and systems that require an operational point shift during power-up or power-down. Due to its adaptive capture and reset features, the BU45K252G-TL is also suitable for systems that require a rapid power-up and reset sequence, as well as systems that require a delayed power-up with a clear reset signal. The BU45K252G-TL is also used in temperature sensing and control applications, providing an adjustable reset threshold for any temperature compensation circuit.

The BU45K252G-TL works by comparing its internal band gap voltage reference to an externally supplied voltage. If the voltage reference drops below the set threshold, the BU45K252G-TL will output a reset signal. The reset interval is adjustable and can range from 0.8msec to 8sec. The reset circuit will then remain in this state until the input voltage is above the threshold voltage or until the reset time period has expired. When the reset time period has expired, the BU45K252G-TL will switch off the reset signal and the system will begin the power-up cycle. Once the system is powered up, the BU45K252G-TL ensures the system operates within the specified parameters.

In summary, the BU45K252G-TL is an integrated circuit that integrates multiple fixed/programmable voltage regulation functions in a single device, categorizing it as part of the Power Management Integrated Circuit (PMIC) suite of power solutions. The BU45K252G-TL belongs to the Supervisors family and can be used in a variety of applications including over-voltage and over-current protection circuits, electronic circuit synchronization, and low-voltage monitoring.

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