BU4918G-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:	1.8V
Operating Temperature:	-40°C ~ 125°C (TA)
Mounting Type:	Surface Mount
Package / Case:	SC-74A, SOT-753
Supplier Device Package:	5-SSOP
Base Part Number:	BU49*

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PMIC - Supervisors

Power Management Integrated Circuit (PMIC) is a type of integrated circuit (IC) that handles power always-on and dynamic regulation for other integrated circuits and systems in portable applications. PMICs offer several advantages over discrete solutions and have become essential components for successful power management. PMIC - Supervisors are one of several categories of PMICs adapted for specific communication interface and application requirements.The BU4918G-TR from ROHM Semiconductor is a lithium-ion battery voltage detection integrated circuit specifically tailored for protection against Lithium-ion battery over and undercharger. This article will discuss the BU4918G-TR\'s application field and working principle.

Application Field

The BU4918G-TR is designed for applications where battery over and undervoltage is a cause for concern. It is typically used in portable media players, smartphones, PDAs, and laptop computers. Other applications include GPS systems, remote control equipment, and electronic toys.The BU4918G-TR is also used to provide charging control for lithium-ion and nickel-cadmium batteries. It monitors the battery voltage during charge and discharge cycles to ensure that it does not exceed the safe voltage limits, thereby protecting the battery from becoming overcharged or discharged. Additionally, the integrated charge detection circuit prevents erroneous operation from differences between the battery voltage and the output voltage of the charging device.

Working Principle

The BU4918G-TR is an integrated circuit that consists of a voltage detection block and an output block.The voltage detection block consists of a voltage comparator, an internal reference voltage and a voltage detection pin. When the battery voltage rises above or drops below the threshold set by the voltage detection voltage, the voltage comparator will trigger the output block to activate.The output block consists of an output transistor and NOR logic gate. When the voltage comparator triggers, the output transistor will turn on, activating the NOR logic gate which will then output a high or low signal depending on the direction of the voltage rise or drop. This signal can then be used to activate an external circuit or it can be used to control a device\'s charging or discharging cycles.

Conclusion

The BU4918G-TR is a specialized integrated circuit designed to provide voltage detection and protection for lithium-ion and nickel-cadmium batteries. With its ability to detect over- and undervoltage, the BU4918G-TR is an excellent choice for applications that require battery protection from over and undercharging. Its integrated charge detection circuit prevents erroneous operation from differences between the battery and the output voltage of the charging device. With its simple design and superior protection, the BU4918G-TR is an excellent choice for use in portable media players, smartphones, PDAs, laptops, GPS systems, remote control equipment, and electronic toys.

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