BQ2054 Datasheet, PDF (1/16 Pages) Texas Instruments – Lithium Ion Fast-Charge IC

bq2054
Lithium Ion Fast-Charge IC
Features
➤ Safe charge of Lithium Ion bat-
tery packs
➤ Voltage-regulated current-
limited charging
➤ Fast charge terminated by se-
lectable minimum current; safety
backup termination on maximum
time
➤ Charging continuously qualified
by temperature and voltage lim-
its
➤ Pulse-width modulation control
ideal for high-efficiency switch-
mode power conversion
➤ Direct LED control outputs dis-
play charge status and fault con-
ditions
General Description
The bq2054 Lithium Ion Fast-
Charge IC is designed to optimize
charging of lithium ion (Li-Ion)
chemistry batteries. A flexible
pulse-width modulation regulator
allows the bq2054 to control voltage
and current during charging. The
regulator frequency is set by an ex-
ternal capacitor for design flexibility.
The switch-mode design keeps
power dissipation to a minimum.
The bq2054 measures battery tem-
perature using an external thermis-
tor for charge qualification. Charging
begins when power is applied or on
battery insertion.
For safety, the bq2054 inhibits
charging until the battery voltage
and temperature are within con-
figured limits. If the battery voltage
is less than the low-voltage thresh-
old, the bq2054 provides low-current
conditioning of the battery.
A constant current-charging phase re-
plenishes up to 70% of the charge ca-
pacity, and a voltage-regulated phase
returns the battery to full. The charge
cycle terminates when the charging
current falls below a user-selectable
current limit. For safety, charging ter-
minates after maximum time and is
suspended if the temperature is out-
side the preconfigured limits.
The bq2054 provides status indica-
tions of all charger states and faults
for accurate determination of the
battery and charge system condi-
tions.
Pin Connections
TM
1
ICTL
2
BAT
3
VCOMP
4
ICOMP
5
ITERM
6
SNS
7
TS
8
16
LED2/DSEL
15
LED1
14
MOD
13
VCC
12
VSS
11
LCOM
10
LED3
9
TPWM
16-Pin Narrow
DIP or SOIC
PN205401.eps
Pin Names
TM
ICTL
BAT
VCOMP
ICOMP
ITERM
SNS
TS
Time-out programming
input
Inrush current control
output
Battery voltage input
Voltage loop comp input
Current loop comp input
Minimum current
termination select input
Sense resistor input
Temperature sense input
TPWM
LED3
LCOM
VSS
VCC
MOD
LED1
LED2/
DSEL
Regulator timebase input
Charge status output 3
Common LED output
System ground
5.0V± 10% power
Modulation control output
Charge status output 1
Charge status output 2/
Display select input
6/99 H
1