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
➤
Optional top-off charge
➤
Selectable pulse trickle charge
rates
➤
Low-power mode
➤
8-pin 300-mil DIP or 150-mil
SOIC
General Description
The bq2002E and bq2002G Fast-
Charge ICs are low-cost CMOS bat
-
tery-charge controllers providing reli
-
able charge termination for both NiCd
and NiMH battery applications. Con
-
trolling a current-limited or con
-
stant-current supply allows the
bq2002E/G to be the basis for a cost-
effective stand-alone or system-inte
-
grated charger. The bq2002E/G inte
-
grates 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 re
-
placement. 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 bq2002E/G op
-
tionally tops-off and pulse-trickles the
battery per the pre-configured limits.
Fast charge may be inhibited using
the INH pin. The bq2002E/G may
also be placed in low-standby-power
mode to reduce system power con-
sumption.
The bq2002E differs from the
bq2002G only in that a slightly dif-
ferent set of fast-charge and top-off
time limits is available. All differ-
ences between the two ICs are illus-
trated inTable 1.
1
NiCd/NiMH Fast-Charge Management ICs
bq2002E/G
TM Timer mode select input
LED
Charging status output
BAT Battery voltage input
V
SS
System ground
1
PN-200201.eps
8-Pin DIP or
Narrow SOIC
2
3
4
8
7
6
5
TM
LED
BAT
V
SS
CC
INH
V
CC
TS
TS Temperature sense input
V
CC
Supply voltage input
INH Charge inhibit input
CC Charge control output
Pin Connections
Pin Names
SLUS132 - FEBRUARY 1999
bq2002E/G Selection Guide
Part No. LBAT TCO HTF LTF
-∆V
PVD Fast Charge t
MTO
Top-Off Maintenance
bq2002E
0.175
∗
V
CC
0.5
∗
V
CC
0.6
∗
V
CC
None
✔
C/2 200 None C/32
✔
1C 80 C/16 C/32
✔
2C 40 None C/32
bq2002G
0.175
∗
V
CC
0.5
∗
V
CC
0.6
∗
V
CC
None
✔
C/2 160 None C/32
✔
1C 80 C/16 C/32
✔
2C 40 None C/32
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