BQ2002C Datasheet, PDF (1/12 Pages) Texas Instruments – NiCd/NiMH Fast-Charge Management IC

bq2002C
NiCd/NiMH Fast-Charge Management IC
Features
➤ Fast charge of nickel cadmium
or nickel-metal hydride batter-
ies
➤ Direct LED output displays
charge status
➤ Fast-charge termination by -∆V,
maximum voltage, maximum
temperature, and maximum
time
➤ Internal band-gap voltage ref-
erence
➤ Selectable pulse-trickle charge
rates
➤ Low-power mode
➤ 8-pin 300-mil DIP or 150-mil
SOIC
General Description
The bq2002C Fast-Charge IC is a low-
cost CMOS battery-charge controller
providing reliable charge termination
for both NiCd and NiMH battery appli-
cations. Controlling a current-limited
or constant-current supply allows the
bq2002C to be the basis for a cost-
effective stand-alone or system-inte-
grated charger. The bq2002C inte-
grates fast charge with 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 Peak voltage detection (PVD)
n Negative delta voltage (-∆V)
n Maximum voltage
n Maximum temperature
n Maximum time
After fast charge, the bq2002C pulse-
trickles the battery per the pre-
configured limits. Fast charge may be
inhibited using the INH pin. The
bq2002C may also be placed in low-
standby-power mode to reduce
system power consumption.
Pin Connections
TM
LED
BAT
VSS
1
8
CC
2
7
INH
3
6
VCC
4
5
TS
8-Pin DIP or
Narrow SOIC
PN-200201.eps
Pin Names
TM
LED
BAT
V_SS
Timer mode select input
Charging status output
Battery voltage input
System ground
TS
Temperature sense input
V_CC
Supply voltage input
INH
Charge inhibit input
CC
Charge control output
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