BQ2003 Datasheet, PDF (1/15 Pages) Texas Instruments – Fast-Charge IC

bq2003
Fast-Charge IC
Features
➤ Fast charge and conditioning of
nickel cadmium or nickel-metal
hydride batteries
➤ Hysteretic PWM switch-mode
current regulation or gated con-
trol of an external regulator
➤ Easily integrated into systems
or used as a stand-alone charger
➤ Pre-charge qualification of tem-
perature and voltage
➤ Direct LED outputs display
battery and charge status
➤ Fast-charge termination by
∆ temperature/∆ time, -∆V, maxi-
mum voltage, maximum tem-
perature, and maximum time
➤ Optional top-off charge
General Description
The bq2003 Fast Charge IC provides
comprehensive fast charge control
functions together with high-speed
switching power control circuitry on a
monolithic CMOS device.
Integration of closed-loop current
control circuitry allows the bq2003
to be the basis of a cost-effective so-
lution for stand-alone and system-
integrated chargers for batteries of
one or more cells.
Switch-activated discharge-before-
charge allows bq2003-based chargers
to support battery conditioning and
capacity determination.
High-efficiency power conversion is
accomplished using the bq2003 as a
hysteretic PWM controller for
switch-mode regulation of the charg-
ing current. The bq2003 may alterna-
tively be used to gate an externally
regulated charging current.
Fast charge may begin on applica-
tion of the charging supply, replace-
ment of the battery, or switch de-
pression. For safety, fast charge is
inhibited unless/until the battery
temperature and voltage are within
configured limits.
Temperature, voltage, and time are
monitored throughout fast charge.
Fast charge is terminated by any of
the following:
n Rate of temperature rise
(∆T/∆t)
n Negative delta voltage (-∆V)
n Maximum voltage
n Maximum temperature
n Maximum time
After fast charge, an optional top-off
phase is available. Constant-cur-
rent maintenence charge is provided
by an external trickle resistor.
Pin Connections
CCMD
1
DCMD
2
DVEN
3
TM1
4
TM2
5
TS
6
BAT
7
VSS
8
16
VCC
15
DIS
14
MOD
13
CHG
12
TEMP
11
MCV
10
TCO
9
SNS
16-Pin DIP or SOIC
PN200301.eps
Pin Names
CCMD
DCMD
DVEN
TM₁
TM₂
TS
BAT
VSS
Charge command/select
Discharge command
-∆V enable/disable
Timer mode select 1
Timer mode select 2
Temperature sense
Battery voltage
System ground
SNS
TCO
MCV
TEMP
CHG
MOD
DIS
VCC
Sense resistor input
Temperature cutoff
Maximum voltage
Temperature status
output
Charging status output
Charge current control
Discharge control
5.0V ± 10% power
SLUS095A - OCTOBER 1999 I
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