BU4845FVE-TR

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Power Management Integrated Circuits (PMICs) are electronic devices that regulate and manage the power in electronic devices, such as computers, TVs, cellular phones, tablets, and many more. Supervisors are special devices placed in a PMIC that provide a set of functions that extend the system’s monitoring, control, and protection capabilities. The BU4845FVE-TR is a low-power, low-cost supervisor IC specifically designed for protecting lithium-ion batteries employed in portable applications. This supervisor works in a system with a constant-voltage/constant-current (CV/CC) lithium-ion battery charger.The BU4845FVE-TR supervisor IC features multiple protection functions, such as voltage monitoring, over-voltage protection, under-voltage protection, over-current protection, short-circuit protection, over-charge protection, and over-discharge protection. It also comes with thermal-shutdown capabilities and a wide range of operating voltage and temperature. This IC works within a voltage range between 2 to 10V, and a temperature range between -55 to +150 degrees Celsius.To better understand the BU4845FVE-TR IC and its capabilities, it is important to understand its application field and working principle. As a supervisor IC, it is an ideal choice for protecting lithium-ion batteries employed in in system with a constant-voltage/constant-current (CV/CC) lithium-ion battery charger. This IC’s multiple protection functions guard the system from over-voltage, under-voltage, over-current, short-circuit, over-charge, and over-discharge situations. Although the BU4845FVE-TR is designed to protect lithium-ion batteries, it can also be used in any application where reliable battery protection is necessary.The BU4845FVE-TR IC uses a built-in voltage comparator circuit to monitor the battery charging voltage and applies an open-drain output if the voltage is outside the programmed window. For example, it may be programmed to trigger the output if the voltage falls below the under-voltage limit or rises above the over-voltage limit. This IC also includes a built-in circuit to provide over-current protection; it will pull low the output if the current in the system rises above the programmed limit.The IC uses a temperature-compensated over-charge protection circuit to prevent over-charging of the lithium-ion battery. It also features an open-drain output that will go low if the voltage rises above the programmed over-charge limit. The same open-drain output is used with the over-discharge protection circuit; it will trigger if the voltage drops below the programmed over-discharge limit.The BU4845FVE-TR IC also includes an open-drain output that provides a short-circuit protection. This output will go low if the voltage in the system drops below the over-current protection limit. This IC also comes with built-in thermal-shutdown circuitry; it will pull low the output if the temperature in the system rises above the thermal-shutdown limit.In conclusion, the BU4845FVE-TR supervisor IC is an ideal choice for protecting lithium-ion batteries employed in portable applications such as computers, TVs, cellular phones, and tablets. This IC provides comprehensive protection from over-voltage, under-voltage, over-current, short-circuit, over-charge, and over-discharge situations. Its built-in voltage comparator and over-charge/over-discharge protection circuits ensure reliable battery protection and system integrity. Moreover, its thermal-shutdown circuitry prevents the IC from overheating and causing damage to the system.

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