Features
➤ Fast charge of nickel cadmium
or nickel-metal hydride batteries
➤ Direct LED output displays
charge status
➤ Fast-charge termination by
rate of rise of temperature,
maximum voltage, maximum
temperature, and maximum
time
➤ Internal band-gap voltage reference
➤ Optional top-off charge (bq2002T
only)
➤ Selectable pulse-trickle charge
rates (bq2002T only)
➤ Low-power mode
➤ 8-pin 300-mil DIP or 150-mil
SOIC

General Description
The bq2002D/T Fast-Charge IC are
low-cost CMOS battery-charge controllers
able to provide reliable charge termination
for both NiCd and NiMH battery
applications. Controlling a
current-limited or constant-current
supply allows the bq2002D/T to be the
basis for a cost-effective stand-alone or
system-integrated charger. The
bq2002D/T 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:
n Rate of temperature rise
n Maximum voltage
n Maximum temperature
n Maximum time
After fast charge, the bq2002T optionally
tops-off and pulse-trickles the
battery per the pre-configured limits.
Fast charge may be inhibited using
the INH pin. The bq2002D/T may be
placed in low-standby-power mode to
reduce system power consumption.