BQ24618RGET

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Battery Chemistry:	Lithium-Ion/Polymer
Number of Cells:	1 ~ 6
Current - Charging:	Constant - Programmable
Programmable Features:	Current, Timer
Fault Protection:	Over Current, Over Temperature, Over Voltage, Short Circuit
Charge Current - Max:	10A
Battery Pack Voltage:	26V (Max)
Voltage - Supply (Max):	28V
Interface:	--
Operating Temperature:	-40°C ~ 85°C (TA)
Package / Case:	24-VFQFN Exposed Pad
Supplier Device Package:	24-VQFN (4x4)
Base Part Number:	BQ24618

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Introduction

PMIC - Battery Chargers enable users to store, power and manage portable electronics efficiently with a long battery life. The BQ24618RGET is a high-efficiency switching-mode battery charger that enables power management in consumer, automotive and industrial applications. This article will discuss the application field and working principle of BQ24618RGET.

Application Field of BQ24618RGET

The BQ24618RGET is a highly integrated, single-cell battery charging IC that is capable of charging single-cell Li-ion and Li-polymer batteries with an input voltage up to 20V. It can be used in consumer electronics, automotive, and industrial applications. In consumer electronics, the BQ24618RGET supports a wide variety of portable electronic devices such as digital cameras, camcorders, portable gaming devices, audio players, and other mobile devices. In the automotive sector, it is suitable for applications such as automotive radar applications and vehicle detection systems. In industrial applications, it can be used in medical equipment, smart meters, HVAC systems, and instrumentation equipment.

Working Principle of BQ24618RGET

The BQ24618RGET is a high-efficiency switching-mode charger, meaning that it operates in a constant on/off cycle to convert input power efficiently into a regulated output voltage. This is accomplished by controlling an integrated power MOSFET switch, which is used to supply power to the battery. The charge control of the BQ24618RGET is regulated by a constant voltage/constant current (CV/CC) algorithm, which keeps the output voltage constant at 4.2V (+/-0.1V) during the CC phase and keeps the current at the programmed value of up to 2A while the voltage is maintained. When the battery is at its full-charge level (V_FULL=4275 mV min), the BQ24618RGET enters the float mode, where it maintains the voltage at 4.2V and limits the current to 10% of the programmed value. The BQ24618RGET also features an adjustable timer to control the maximum charging time, as well as an input voltage regulator to protect against instant voltage spikes.

Conclusion

The BQ24618RGET is a high-efficiency switching-mode battery charger that provides efficient power management in a variety of consumer, automotive, and industrial applications. It can be used to charge single-cell Li-ion and Li-polymer batteries with inputs up to 20V, and its CV/CC algorithm ensures that the voltage is held constant at 4.2V, while the current is kept at the programmed rate. The BQ24618RGET also features an adjustable timer to ensure a safe maximum charging time, as well as an input voltage regulator to protect against voltage spikes.

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