Features
➤ Fast charge of nickel cadmium
or nickel-metal hydride batteries
➤ Direct LED output displays
charge status
➤ Fast-charge termination by -ΔV,
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

General Description
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 (-ΔV)

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. All differences
between the two ICs are illustrated
in Table 1.