Series:	--
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Function:	Battery Protection
Battery Chemistry:	Lithium-Ion
Number of Cells:	2 ~ 4
Fault Protection:	Over Voltage
Interface:	--
Operating Temperature:	-40°C ~ 110°C (TA)
Package / Case:	8-WFDFN Exposed Pad
Supplier Device Package:	8-WSON (2x2)
Base Part Number:	BQ294700

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PMIC - Battery Management

IntroductionThe BQ294700DSGT from Texas Instruments (TI) is an application-specific integrated circuit (ASIC) for battery management, specifically for Lithium batteries. It integrates a battery charge/discharge protection circuit and a set of peripheral functions for Li-ion/Lithium Polymer (Li-Po) batteries. The TI BQ294700DSGT helps ensure battery safety and has a wide range of applications, such as consumer electronics, digital cameras, cell phones and so on.Presently, Li-ion battery packs present a challenge for designing a circuit to protect them during charging, such as preventing overcharging. Li-ion/Li-Po batteries must be equipped with additional safety circuits to protect them from undergoing extreme temperature and overvoltage, short circuits or overdischarge conditions. The BQ294700DSGT is designed especially to protect Li-ion battery packs and to provide various other peripheral functions. Application FieldThe BQ294700DSGT provides high maximum overvoltage connection (OV) protection and overdischarge protection (OD) for Lithium-ion battery packs. The device offers adjustable voltage, current, temperature and reclocker limiter limits, as well as active cell balancing for Lithium battery packs. The applications of the BQ294700DSGT include laptop computer Li-ion battery packs, digital cameras Li-ion battery packs, cell phones Li-on battery packs and portable gaming devices Li-ion battery packs.The BQ294700DSGT features a system reset to ensure that the system can recover from a severe overload condition. The system reset offers high reliability against safety risks due to unexpected voltage and current conditions. The system reset is programmable, and a high reliability delay for the system reset protects the system from overvoltage.Moreover, the device provides latest battery information and monitoring at any time. The set of monitoring and information registers of BQ294700DSGT simplifies the interface between the battery pack and the system. This information can be used in data logging, battery status display and system protection applications.Working PrincipleThe BQ294700DSGT monitors the critical conditions during the charging and discharging of the battery pack. The device is designed with a very low quiescent current of approximately 2 μA and low leakage current, provided by the auto-reclocking feature of the BQ294700DSGT.When AC adapter is connected to the device, the power-on reset (POR) activates. The charge and discharge protection circuit turns on its switch and a voltage is applied to the battery pack. The device monitors the cell voltages Vcell and regulates the charge current.The device uses the voltage and current information to control the charging process of the battery pack. The regulation of the charging current is done in 4 levels, depending on the magnitude of the peak current. The chip charges the battery pack until a predefined voltage is reached.The discharged condition is monitored and managed through the Over discharge current and the Overvoltage protection circuitry. The Overdischarge protection circuitry circuit uses a voltage threshold and the amount of current below the minimum charge current to detect an Over discharge condition. The Overvoltage protection circuitry, on the other hand, uses a voltage sample to detect an Overvoltage condition.The temperature protection circuitry stops the charging process when it detects a temperature higher than the predefined threshold. The safety and monitoring functions of the device help to reduce the risks related to battery usage, ensuring a safe and secure charging process.ConclusionThe BQ294700DSGT from Texas Instruments is a highly integrated device for battery management. It helps to ensure battery safety and is widely applicable to a variety of battery packs, such as Li-ion, Li-Po and Lithium batteries. The device offers adjustable voltage, current and temperature limits and monitors critical charging and discharging conditions. The BQ294700DSGT is a great solution for safe and secure battery protection, and is a must-have for large battery application fields.

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