Samsung Electronics
10-7
IC Internal Diagram
10-3 BQ2002 ; BIC1
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.
T h e b q 2 0 0 2 F d i f f e r s f r o m t h e
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.
NiCd/NiMH Fast-Charge Management ICs
bq2002/F
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
VSS
CC
INH
VCC
TS
TS
Temperature sense input
V
CC
Supply voltage input
INH
Charge inhibit input
CC
Charge control output
Pin Connections
Pin Names
bq2002/F Selection Guide
Part No.
TCO
HTF
LTF
-
∆
V
PVD
Fast Charge
t
MTO
Top-Off
Maintenance
bq2002
0.5
∗
V
CC
None
None
✔
C/2
160
C/32
C/64
✔
1C
80
C/16
C/64
✔
2C
40
None
C/32
bq2002F 0.5
∗
V
CC
None
None
✔
C/2
160
C/32
C/64
✔
1C
100
C/16
C/64
✔
2C
55
None
C/32
SLUS131–JANUARY 1999 D
Содержание Wingo S-2450
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