LP3918TL/NOPB Integrated Circuits (ICs)

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Battery Chemistry:	Lithium-Ion
Number of Cells:	--
Current - Charging:	Constant - Programmable
Programmable Features:	--
Fault Protection:	Reverse Current
Charge Current - Max:	950mA
Battery Pack Voltage:	4.2V
Voltage - Supply (Max):	6V
Interface:	I²C
Operating Temperature:	-40°C ~ 85°C (TA)
Package / Case:	25-WFBGA
Supplier Device Package:	25-uSMD
Base Part Number:	LP3918

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LP3918TL/NOPB - Introduction

LP3918TL/NOPB is an integrated circuit that is part of the Power Management Integrated Circuit (PMIC) family. It is a battery charger, specifically, a three-channel linear charger, and is used in a variety of applications. Its functions include charging supervision, voltage control, and maximum current and voltage control.

Applications of LP3918TL/NOPB

LP3918TL/NOPB is mainly used for various types of battery charging, such as single lithium-ion, single lead-acid and nickel-metal hydride batteries. It is also applicable for powering devices from a power source, providing USB compatible output with a high output voltage accuracy in the range of 4.2V to 7V.In battery-powered digital media applications, LP3918TL/NOPB acts as a battery charger for cell phones, digitally cameras and camcorders, portable media players, and more. In addition, it is suitable for use in cell phones, laptop computers, hand-held PCs, and personal digital assistants.In automotive applications, LP3918TL/NOPB is used in battery management systems to provide power sequencing and sequencing of multiple battery packs in order to extend the battery life of a vehicle. It is also used in advanced driver assistance systems (ADAS) to control the battery charging times over its life cycle.

Working Principle of LP3918TL/NOPB

The LP3918TL/NOPB is a three-channel linear charger. It uses a switching/controlled resistor based buck converter to reduce input voltage to the battery voltage. Input voltage is monitored by a voltage divider, which then provides the feedback to the circuit to adjust its output voltage to the desired level.Each channel has an independently adjustable reference voltage which can be controlled with a junction-EEPROM device. The current limit for each channel is also configurable within the same circuit.The chip also features protection features such as over voltage and over current protection. A temperature sensor monitors the hot/cold junction temperature of the IC to ensure that the maximum battery temperature does not exceed the recommended level.

Conclusion

The LP3918TL/NOPB is an advanced three-channel linear charger that is part of the PMIC family. It is mainly used for single lithium-ion, single lead-acid, and nickel-metal hydride battery charging, as well as power sequencing and sequencing of multiple battery packs in automotive applications. It works by using a switching/controlled resistor based buck converter to reduce input voltage to the battery voltage and provides protection features such as over voltage and over current protection.

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