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BQ2003 Datasheet

  • BQ2003

  • Fast-Charge IC

  • 15頁

  • TI

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bq2003
Fast-Charge IC
Features
鉃?/div>
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
鈭?/div>
temperature/鈭?time, -鈭哣, 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.
鉃?/div>
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
鉃?/div>
鉃?/div>
鉃?/div>
鉃?/div>
Rate of temperature rise
(鈭員/鈭唗)
Negative delta voltage (-鈭哣)
Maximum voltage
Maximum temperature
Maximum time
n
n
n
n
鉃?/div>
After fast charge, an optional top-off
phase is available. Constant-cur-
rent maintenence charge is provided
by an external trickle resistor.
Pin Connections
Pin Names
CCMD
DCMD
Charge command/select
Discharge command
-鈭哣 enable/disable
Timer mode select 1
Timer mode select 2
SNS
TCO
MCV
TEMP
CHG
Sense resistor input
Temperature cutoff
Maximum voltage
Temperature status
output
Charging status output
Charge current control
Discharge control
5.0V
鹵
10% power
CCMD
DCMD
DVEN
TM1
TM2
TS
BAT
VSS
1
16
15
14
13
12
11
10
9
VCC
DIS
MOD
CHG
TEMP
MCV
TCO
SNS
DVEN
TM
1
TM
2
TS
BAT
V
SS
2
3
4
5
6
7
8
Temperature sense
MOD
Battery voltage
DIS
System ground
V
CC
16-Pin DIP or SOIC
PN200301.eps
SLUS095A - OCTOBER 1999
I
1

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