BQ2002DSNG4

Series:	--
Packaging:	Tube
Part Status:	Active
Battery Chemistry:	Multi-Chemistry
Number of Cells:	--
Current - Charging:	--
Programmable Features:	Voltage
Fault Protection:	--
Charge Current - Max:	--
Battery Pack Voltage:	2V
Voltage - Supply (Max):	6V
Interface:	--
Operating Temperature:	0°C ~ 70°C (TA)
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	8-SOIC
Base Part Number:	BQ2002

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Introduction

Battery chargers are devices used to recharge secondary batteries by transferring energy from a source of electric power to the battery. Charging a battery is done by slowly increasing the current, often slowly increasing the voltage, to avoid damage to the battery, and to reduce the amount of time it takes to charge.The BQ2002DSNG4 from Texas Instrument is a dual charge management system for NiMH battery packs. It is a low-cost, low-power device for managing the charging of NiMH batteries used in cordless phones, portable computers and other portable electronic devices.

Application Field and Working Principle

The BQ2002DSNG4 can be used with a wide range of NiMH battery packs.The device monitors the cell voltage, current, temperature and power output to ensure proper charging and maximum battery life. It also offers advanced safety features such as current limiting, voltage limiting and over-temperature protection.The internal charge control circuitry circuitry is designed to prevent overcharging of the cells, to maintain a low operating temperature and to reduce damage to the cells due to overvoltage.The device consists of two charge control channels, a controller and a sense amplifier. The controller continuously monitors the battery voltage, current and temperature to determine the charge state of the battery pack. The sense amplifier senses the battery voltage, current and temperature and adjusts the charging current accordingly. The controller can be programmed via a serial interface or remotely controlled via an external interface.The controller also offers several features for regulating the charging current and optimizing charging time such as automatic cell balancing, voltage/current limiting and battery temperature monitoring/protection.The device also offers an array of protection features such as: over-voltage protection, over-current protection, reverse current protection, over-temperature protection, and short circuit protection.The device is packaged in a 7-pin SOP package, and is capable of operating over a temperature range of 0°C to +70°C The device is lead free and RoHS compliant.

Conclusion

In conclusion the BQ2002DSNG4 from Texas Instrument is a dual charge management system for NiMH battery packs is ideal for NiMH battery charging in portable applications. It provides advanced features for monitoring and controlling the charging process, as well as offering protection features for the battery. The device is packaged in a 7-pin SOP package, and can operate over a temperature range of 0°C to +70°C.

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