BQ24018DRCR

Series:	bqTINY™
Packaging:	Tape & Reel (TR)
Part Status:	Active
Battery Chemistry:	Lithium-Ion/Polymer
Number of Cells:	1
Current - Charging:	Constant - Programmable
Programmable Features:	Current, Timer
Fault Protection:	Short Circuit
Charge Current - Max:	1A
Battery Pack Voltage:	4.36V
Voltage - Supply (Max):	16.5V
Interface:	--
Operating Temperature:	-40°C ~ 125°C (TJ)
Package / Case:	10-VFDFN Exposed Pad
Supplier Device Package:	10-VSON (3x3)
Base Part Number:	BQ24018

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Introduction

The BQ24018DRCR is a Battery Management IC from Texas Instruments, which is a power management integrated circuit (PMIC). It provides battery charging solutions for portable applications. It integrates a high performance boost converter for charging battery and several power components for system power supply. In addition, the device has battery gauge and protection functions that provide system power and overcharge protection.

Application Field

The BQ24018DRCR applies to Li+ battery charging in portable applications such as mobile phones, digital cameras, PDAs and MP3 players. It has a wide operating input voltage range of 4.5V to 28V and an adjustable output charge voltage. It is a highly integrated, cost effective, three-channel battery charging solution that can be used to support multiple battery type and charge strategies.

Working Principle

At the heart of the BQ24018DRCR is a high efficiency buck-boost regulator, which handles the battery voltage regulation and current limit control. This integrated circuit (IC) combines a high performance boost converter and several power components including mosfets, a comparator and a timer, to provide a complete battery charging solution. The boost converter is used to regulate the voltage and current of the battery, while the mosfets provide insulation from the high voltage of the battery.In addition, the BQ24018DRCR uses two charging channels for charging the Li+ battery. One of the channels is designed for the simultaneous charging of two Li+ batteries. The other channel is used to provide an uninterrupted, gradual, and controlled voltage and current to the battery. The device also has a built-in comparator, which is used to monitor the battery voltage and terminate the charging when it reaches the predefined level.

Conclusion

The BQ24018DRCR is a highly integrated PMIC designed for Li+ battery charging applications in portable applications such as mobile phones, digital cameras, PDAs and MP3 players. Its high efficiency buck-boost regulator enables it to regulate voltage and current while its two charging channels can be used to charge up to two Li+ batteries. The device also includes a comparator which monitors the battery voltage and terminates the charging when it reaches the predefined level.

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