BQ2002D_14 Datasheet, PDF (1/17 Pages) Texas Instruments – NiCd/NiMH Fast-Charge Management ICs

bq2002D/T
NiCd/NiMH Fast-Charge Management ICs
Features
➤ Fast charge of nickel cadmium
or nickel-metal hydride batter-
ies
➤ 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 ref-
erence
➤ 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
Pin Connections
General Description
The bq2002D/T Fast-Charge IC are
low-cost CMOS battery-charge control-
lers able to provide reliable charge ter-
mination for both NiCd and NiMH bat-
tery 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 con-
trol 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 re-
placement. For safety, fast charge is
inhibited if the battery temperature
and voltage are outside configured
limits.
Pin Names
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 option-
ally 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.
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
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
bq2002D/T Selection Guide
Part No.
TCO
HTF
LTF
bq2002D 0.225 ∗ VCC 0.25 ∗ VCC
None
bq2002T 0.225 ∗ VCC 0.25 ∗ VCC 0.4 ∗ VCC
Fast Charge
C/4
1C
2C
C/4
1C
2C
Time-Out
440 min
110 min
55 min
320 min
80 min
40 min
Top-Off
None
None
None
C/64
C/16
None
Maintenance
None
None
None
C/256
C/256
C/128
SLUS133 – APRIL 2009
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