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BQ2054-BQ2054PN-BQ2054SN-BQ2054SNTR
Li-Ion Switchmode Charge Management IC
Features Safe chargeof Lithium Ion bat-
tery packs Voltage-regulated current-
limitedcharging Fast charge terminatedby se-
lectable minimum current; safety
backup terminationon maximum
time Charging continuously qualified temperature and voltage lim-
its Pulse-width modulation control
idealfor high-efficiency switch-
mode power conversion Direct LED control outputs dis-
play charge status and fault con-
ditions
General DescriptionThe bq2054 Lithium Ion Fast-
ChargeICis designedto optimize
chargingof lithium ion (Li-Ion)
chemistry batteries.A flexible
pulse-width modulation regulator
allows the bq2054to control voltage
and current during charging. The
regulator frequencyissetbyanex-
ternal capacitorfor design flexibility.
The switch-mode design keeps
power dissipationtoa minimum.
The bq2054 measures battery tem-
perature usingan external thermis-
torfor charge qualification. Charging
begins when poweris appliedoron
batteryinsertion.
For safety, the bq2054 inhibits
charging until the battery voltage
and temperature are within con-
figured limits.If the battery voltage less than the low-voltage thresh-
old,the bq2054 provides low-current
conditioningof thebattery. constant current-charging phasere-
plenishesupto 70%ofthe chargeca-
pacity, anda voltage-regulated phase
returnsthe batteryto full. The charge
cycle terminates when the charging
current falls belowa user-selectable
current limit. For safety, chargingter-
minates after maximum time andis
suspendedif the temperatureis out-
sidethepreconfiguredlimits.
The bq2054 provides status indica-
tionsofall charger states and faults
for accurate determinationof the
battery and charge system condi-
tions.
Lithium Ion Fast-Charge IC Time-out programming
input
ICTL Inrush current control
output
BAT Battery voltage input
VCOMP Voltage loop comp input
ICOMP Current loop comp input
ITERM Minimum current
termination select input
SNS Sense resistor input Temperature sense input
TPWM Regulator timebase input
LED3 Charge status output 3
LCOM Common LED output
VSS System ground
VCC 5.0V±10% power
MOD Modulation control output
LED1 Charge status output 1
LED2/ Charge status output 2/
DSEL Display select input
Pin Connections Pin Names6/99 H
