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BQ2002D Datasheet(PDF) 1 Page - Texas Instruments

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Part No. BQ2002D
Description  NiCd/NiMH Fast-Charge Management ICs
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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BQ2002D Datasheet(HTML) 1 Page - Texas Instruments

 
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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
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 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.
1
NiCd/NiMH Fast-Charge Management ICs
bq2002D/T
TM
Timer mode select input
LED
Charging status output
BAT
Battery voltage input
VSS
System ground
1
PN-200201.eps
8-Pin DIP or
Narrow SOIC
2
3
4
8
7
6
5
TM
LED
BAT
VSS
CC
INH
VCC
TS
TS
Temperature sense input
VCC
Supply voltage input
INH
Charge inhibit input
CC
Charge control output
Pin Connections
Pin Names
bq2002D/T Selection Guide
Part No.
TCO
HTF
LTF
Fast Charge
Time-Out
Top-Off
Maintenance
bq2002D
0.225
∗ VCC
0.25
∗ VCC
0.4
∗ VCC
C/4
320 min
C/64
C/256
1C
80 min
C/16
C/256
2C
40 min
None
C/128
bq2002T
0.225
∗ VCC
0.25
∗ VCC
None
C/4
440 min
None
None
1C
110 min
None
None
2C
55 min
None
None
SLUS133–JANUARY 2000 E


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