LTC4121EUD-4.2#PBF

Series:	--
Packaging:	Tube
Part Status:	Active
Battery Chemistry:	Lithium-Ion/Polymer
Number of Cells:	--
Current - Charging:	Constant - Programmable
Programmable Features:	--
Fault Protection:	--
Charge Current - Max:	400mA
Battery Pack Voltage:	4.2V
Voltage - Supply (Max):	40V
Interface:	--
Operating Temperature:	-40°C ~ 125°C (TJ)
Package / Case:	16-WFQFN Exposed Pad
Supplier Device Package:	16-QFN (3x3)
Base Part Number:	LTC4121

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LTC4121EUD-4.2#PBF Application Field and Working Principle

Power Management Integrated Circuit (PMIC) is a type of integrated circuit that is responsible for controlling the power in electronic designs. It contains components like voltage regulators, power converters, charge controllers, battery chargers, and more. One of the most advanced PMIC options is the LTC4121EUD-4.2#PBF, designed for battery management systems.

Application Field

The LTC4121EUD-4.2#PBF is a highly efficient, high current battery charger. It operates from a wide input voltage range from 2V to 60V and supports up to 8A of charge current. It is primarily used in a variety of applications including industrial control equipment, telecommunications, automotive electronics, medical devices, and portable electronics. It offers precise charge current, guaranteed charging accuracy, and fast TIME-TO-FULL performance.

Working Principle

The LTC4121EUD-4.2#PBF uses an advanced continuous conduction mode (CCM) buck-boost switching regulator to charge a battery or other power supply. The CCM buck-boost topology operates in four modes depending on the input/output voltage and power levels: buck, boost, buck-boost, or bypass. In buck and buck-boost modes, the LTC4121EUD-4.2#PBF will act as a DC-DC converter and provides step-down and step-up functions from the input voltage source. In boost and buck-boost modes, the device acts as an energy storage element and acts as a supercapacitor to store excess energy from the input source. In bypass mode, the buck-boost switching regulator will be disabled and a current-limited, low dropout linear regulator is used instead. As a result, the system is capable of quick response and prevents any unexpected overcurrent.The LTC4121EUD-4.2#PBF also utilizes advanced digital control techniques to accurately monitor and control the battery charge current during the charging process. It can detect the amount of current required to maintain a steady charge and adjust the charge current accordingly. Additionally, it has fault-protected regulation, overvoltage protection, brownout protection, dynamic inrush control, and EMI immune features, making it the perfect solution for reliable battery charging applications.

Conclusion

The LTC4121EUD-4.2#PBF is an advanced and feature-rich power management integrated circuit (PMIC) designed for battery management systems. It is capable of precision charge current, guaranteed charging accuracy, and fast response times. It is primarily used in a variety of industrial, telecommunications, automotive, medical, and portable electronics applications. Its advanced digital control techniques and fault protection ensure reliable operation and makes it the perfect choice for demanding applications.

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