The bq2002 and bq2002/F 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 bq2002/F to be the basis for a cost-effective stand-alone or system-integrated charger. The bq2002/F integrates fast charge with optional top-off and pulsed-trickle control in a single IC for charging one or more NiCd or NiMH battery cells.
●Fast charge 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 is terminated by any of the following:
● Peak voltage detection (PVD)
● Negative delta voltage (-V)
● Maximum voltage
● Maximum temperature
● Maximum time
●After fast charge, the bq2002/F optionally tops-off and pulse-trickles the battery per the pre-configured limits. Fast charge may be inhibited using the INH pin. The bq2002/F may also be placed in low-standby-power mode to reduce system power consumption.
●The bq2002F differs from the bq2002 only in that a slightly different set of fast-charge and top-off time limits is available.
● Fast charge of nickel cadmium or nickel-metal hydride batteries
● Direct LED output displays charge status
● Fast-charge termination by -V, maximum voltage, maximum temperature, and maximum time
● Internal band-gap voltage reference
● Optional top-off charge
● Selectable pulse trickle charge rates
● Low-power mode
● 8-pin 300-mil DIP or 150-mil SOIC
