bq2003
Fast-Charge IC
Features General Description вћ¤ Fast charge and conditioning of
nickel cadmium or nickel-metal
hydride batteries вћ¤ Hysteretic PWM switch-mode
current regulation or gated control of an external regulator The bq2003 Fast Charge IC provides
comprehensive fast charge control
functions together with high-speed
switching power control circuitry on a
monolithic CMOS device. вћ¤ Easily integrated into systems
or used as a stand-alone charger вћ¤ Pre-charge qualification of temperature and voltage вћ¤ Direct LED outputs display
battery and charge status вћ¤ Fast-charge termination by
∆ temperature/∆ time, -∆V, maximum voltage, maximum temperature, and maximum time ➤ Optional top-off charge Pin Connections Integration of closed-loop current
control circuitry allows the bq2003
to be the basis of a cost-effective solution for stand-alone and systemintegrated chargers for batteries of
one or more cells.
Switch-activated discharge-beforecharge allows bq2003-based chargers
to support battery conditioning and
capacity determination.
High-efficiency power conversion is
accomplished using the bq2003 as a
hysteretic PWM controller for
switch-mode regulation of the charging current. The bq2003 may alternatively be used to gate an externally …