BQ2002FSNTRG4 Datasheet, PDF (1/17 Pages) Texas Instruments – NiCd/NiMH Fast-Charge Management ICs

bq2002/F
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 -∆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 bq2002 and bq2002/F Fast-Charge
ICs are low-cost CMOS battery-charge
controllers providing reliable charge
termination for both NiCd and NiMH
battery applications. Controlling a
current-limited or constant-current
supply allows the bq2002/F to be the
basis for a cost-effective stand-alone or
system-integrated charger. The
bq2002/F 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 Peak voltage detection (PVD)
n Negative delta voltage (-∆V)
n Maximum voltage
n Maximum temperature
n Maximum time
After fast charge, the bq2002/F op-
tionally tops-off and pulse-trickles the
battery per the pre-configured limits.
Fast charge may be inhibited using
the INH pin. The bq2002/F may also
be placed in low-standby-power mode
to reduce system power consumption.
The bq2002F differs from the
bq2002 only in that a slightly differ-
ent set of fast-charge and top-off
time limits is available. All differ-
ences between the two ICs are illus-
trated in Table 1.
Pin Connections
Pin Names
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
bq2002/F Selection Guide
Part No. TCO HTF
bq2002 0.5 ∗ VCC None
bq2002F 0.5 ∗ VCC None
LTF
None
None
-∆V PVD
✔
✔
✔
✔
✔
✔
Fast Charge
C/2
1C
2C
C/2
1C
2C
tMTO
160
80
40
160
100
55
TS
Temperature sense input
V_CC
Supply voltage input
INH
Charge inhibit input
CC
Charge control output
Top-Off
C/32
C/16
None
C/32
C/16
None
Maintenance
C/64
C/64
C/32
C/64
C/64
C/32
SLUS131 – APRIL 2009
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