bq2002E

The bq2002E and bq2002G Fast-Charge ICs are low-cost CMOS battery-charge controllers providing reliable charge termination for both NiCd and NiMH battery applications. Controlling a current-limited or constant-current supply allows the bq2002E/G to be the basis for a costeffective stand-alone or system-inte-grated charger. The bq2002E/G integrates fast charge with optional top-off and pulsed- trickle control in a single IC for charging one or more NiCd or NiMHbatterycells.


Fast charge of bq2002E is initiated on application of the charging supply or battery replacement. For safety, fast charge is inhibited if the battery temperature and voltage are outside configured limits.


Fast charge of bq2002E is terminated by any of thefollowing:
Peakvoltagedetection(PVD)
Negativedeltavoltage(-V)
Maximumvoltage
Maximumtemperature
Maximumtime


After fast charge, the bq2002E/G optionally tops-off and pulse-trickles the battery per the pre-configured limits.Fast charge may be inhibited using the INH pin. The bq2002E/G may also be placed in low-standby-power mode to reduce system power consumption.


The bq2002E differs from the bq2002G only in that a slightly different set of fast-charge and top-off time limits is available. All differences between the two ICs are illustratedinTable1.