The bq2004E and bq2004H Fast Charge ICs provide comprehensive fast charge control functions together with high-speed switching power control circuitry on a monolithic CMOS device.
●Integration of closed-loop current control circuitry allows the bq2004 to be the basis of a cost-effective solution for stand-alone and system-integrated chargers for batteries of one or more cells.
●Switch-activated discharge-before-charge allows bq2004E/H-based chargers to support battery conditioning and capacity determination.
●High-efficiency power conversion is accomplished using the bq2004E/H as a hysteretic PWM controller for switch-mode regulation of the charging current. The bq2004E/H may alternatively be used to gate an externally regulated charging current.
●Fast charge may begin on application of the charging supply, replacement of the battery, or switch depression. For safety, fast charge is inhibited unless/until the battery temperature and voltage are within configured limits.
●Temperature, voltage, and time are monitored throughout fast charge. Fast charge is terminated by any of the following:
● Rate of temperature rise (t)
● Peak voltage detection (PVD)
● Negative delta voltage (-V)
● Maximum voltage
● Maximum temperature
● Maximum time
●After fast charge, optional top-off and pulsed current maintenance phases with appropriate display mode selections are available.
●The bq2004H differs from the bq2004E only in that fast charge, hold-off, and top-off time units have been scaled up by a factor of two, and the bq2004H provides different display selections.
● Fast charge and conditioning of nickel cadmium or nickel-metal hydride batteries
● Hysteretic PWM switch-mode current regulation or gated control of an external regulator
● Easily integrated into systems or used as a stand-alone charger
● Pre-charge qualification of temperature and voltage
● Configurable, direct LED outputs display battery and charge status
● Fast-charge termination by V, maximum voltage, maximum temperature, and maximum time
● Optional top-off charge and pulsed current maintenance charging
● Logic-level controlled low-power mode (< 5uA standby current)
