BQ2954 ,Li-Ion Switchmode Charge Management ICBlock DiagramCharge Qualification
BQ2954PN ,Li-Ion Switchmode Charge Management ICGeneral Descriptionphases. First a constant-currentphase replenishes approximately➤ Safe charge of ..
BQ2954SN ,Li-Ion Switchmode Charge Management ICGeneral Descriptionphases. First a constant-currentphase replenishes approximately➤ Safe charge of ..
BQ2954SNTR ,Li-Ion Switchmode Charge Management ICBlock DiagramCharge Qualification
BQ2954SNTRG4 ,Switch-mode Li-Ion Charge Controller 16-SOIC 0 to 70General Descriptionphases. First a constant-currentphase replenishes approximately➤ Safe charge of ..
BQ3055DBTR ,2-Series, 3-Series, and 4-Series Li-Ion Battery Pack Manager 30-TSSOP -40 to 85Electrical Characteristics: Supply Current........ 58.3 Feature Description.... 176.6 Power-On Rese ..
BUZ10 ,Trans MOSFET N-CH 50V 23A 3-Pin(3+Tab) TO-220BUZ10®N - CHANNEL 50V - 0.06Ω - 23A TO-220STripFET™ MOSFETTYPE V R IDSS DS(on) DBUZ10 50 V < 0.0 ..
BUZ100 ,N-Channel SIPMOS Power TransistorCharacteristicsDrain- source breakdown voltage V V(BR)DSSV = 0 V, I = 0.25 mA, T = -40 °C 50 - -GS ..
BUZ100S ,SIPMOS Power Transistor (N channel Enhancement mode Avalanche-rated dv/dt rated)FeaturesDrain source voltage 55 VV• N channel DSDrain-Source on-state resistance 0.015R Ω• Enhancem ..
BUZ100S ,SIPMOS Power Transistor (N channel Enhancement mode Avalanche-rated dv/dt rated)CharacteristicsDrain- source breakdown voltage 55 - - VV(BR)DSSV = 0 V, I = 0.25 mAGS D2.1 3 4Gate ..
BUZ100SL ,N-Channel SIPMOS Power TransistorFeaturesDrain source voltage 55 VVDS• N channelDrain-Source on-state resistance 0.012R Ω• Enhanceme ..
BUZ101S ,SIPMOS Power Transistor (N channel Enhancement mode Avalanche-rated d v/d t rated)FeaturesDrain source voltage 55 VV• N channel DSDrain-Source on-state resistance 0.05R Ω• Enhanceme ..
BQ2954-BQ2954PN-BQ2954SN-BQ2954SNTR-BQ2954SNTRG4
Li-Ion Switchmode Charge Management IC
Features Safe chargeof Li-Ion battery
packs Pulse-width modulation control
for current and voltage reg-
ulation Programmable high-side/low-side
current-sense Fast charge terminatedby se-
lectable minimum current; safety
backup terminationat maximum
time Pre-charge qualification detects
shortedor damaged cells and
conditions battery Charging continuously qualified temperature andvoltagelimits Direct LED control outputsto
display charge status and fault
conditions
General DescriptionThe bq2954 Li-Ion Charge-Manage-
mentIC usesa flexible pulse-width
modulation regulatorto control volt-
age and current during charging.
The regulator frequencyissetbyan
external capacitor for design flexi-
bility. The switch-mode design mini-
mizes power dissipation.
For safety, the bq2954 inhibits fast
charging until the battery voltage
and temperature are within config-
ured limits.If the battery voltageis
less than the low-voltage threshold,
the bq2954 provides low-current
conditioningof thebattery.
For charge qualifiction, the bq2954
usesan external thermistorto mea-
sure battery temperature. Charging
begins when poweris appliedor the
batteryisinserted
The bq2954 chargesa batteryin two
phases. Firsta constant-current
phase replenishes approximately
70%of battery capacity. Thena volt-
age-regulation phase completes the
battery charge.
The bq2954 provides status indica-
tionsofall charger states and faults
for accurate determinationof the
battery and charge-system condi-
tions. Time-outprogramming
input
CHG Charge active output
BAT Battery voltage input
VCOMP V oltageloopcomp input
ICOMP Currentloopcomp input
ITERM Minimum current
termination selectinput
SNS Sense resistor input Temperaturesenseinput
TPWM Regulatortimebaseinput
BTST Battery test output
LCOM Common LED output
VSS System ground
VCC 5.0V±10% power
MOD Modulation control
output
LED1/ Charge status output 1/
CSEL Charge sense select
input
LED2/ Charge status output 2/
DSEL Display select input
Pin Connections Pin NamesSLUS064–OCTOBER 1998 B
Lithium Ion Charge Management IC
with Integrated Switching Controller
bq2954
