Rechargeable Alkaline Charge/Discharge Controller IC

The BQ2902 is a low-cost charger for rechargeable alkaline batteries such as Renewal batteries from Rayovac. The BQ2902 combines sensitive, full- charge detection for two recharge- able alkaline cells, with a low-battery cut-off for overdischarge protection. Designed for system integration into a two-cell system, the BQ2902 CAN improve the service life of the rechargeable alkaline cells by prop- erly managing the charge and dis- charge. The BQ2902 requires a voltage limited current source to generate the proper charge pulses for the Renewal cell. Each cell is individually monitored to ensure full charge without a damaging overcharge. Charge completion is indicated when the average charge rate falls below approximately 3% of the fast charge rate. A status output is pro- vided to indicate charge in progress, charge complete, or fault indication. The BQ2902 avoids over-depleting the battery by using the internal end-of-discharge control circuit. The BQ2902 also eliminates the external power switching transis- tors needed to separately charge individual Renewal cells. For safety, charging is inhibited if the per-cell voltage is greater than 3.0V during charge (closed-circuit voltage), or if the cell voltage is less than 0.4V (open-circuit voltage). By Texas Instruments
BQ2902 's PackagesBQ2902 's pdf datasheet

BQ2902 Pinout, Pinouts
BQ2902 pinout,Pin out
This is one package pinout of BQ2902,If you need more pinouts please download BQ2902's pdf datasheet.

BQ2902 Application circuits
BQ2902 circuits
This is one application circuit of BQ2902,If you need more circuits,please download BQ2902's pdf datasheet.

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