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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
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.
Fast charge is terminated by any of
the following:
n
n
n
n
Rate of temperature rise
Maximum voltage
Maximum temperature
Maximum time
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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.
Pin Connections
TM
LED
BAT
VSS
1
2
3
4
8
7
6
5
CC
INH
VCC
TS
Pin Names
TM
LED
BAT
V
SS
Timer mode select input
Charging status output
Battery voltage input
System ground
TS
V
CC
INH
CC
Temperature sense input
Supply voltage input
Charge inhibit input
Charge control output
8-Pin DIP or
Narrow SOIC
PN-200201.eps
bq2002D/T Selection Guide
Part No.
bq2002D
TCO
0.225
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V
CC
HTF
0.25
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V
CC
LTF
0.4
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V
CC
Fast Charge
C/4
1C
2C
C/4
1C
2C
Time-Out
320 min
80 min
40 min
440 min
110 min
55 min
Top-Off
C/64
C/16
None
None
None
None
Maintenance
C/256
C/256
C/128
None
None
None
bq2002T
0.225
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V
CC
0.25
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V
CC
None
SLUS133鈥揓ANUARY 2000 E
1
BQ2002DPN相關(guān)型號(hào)PDF文件下載
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