LTC4099 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC4099' PDF : 36 Pages View PDF
LTC4099
Operation
occurs, it may be desirable to have application software
enforce an emergency reduction of power in the portable
product. It is possible to enable the battery conditioner
circuit at this temperature to reduce stress caused by
simultaneous high temperature and high voltage via the
I2C port. See the Overtemperature Battery Conditioner
section.
The thermistor detection circuit samples the thermistor’s
value continuously whenever charging is enabled and
periodically when it is not. When the charger is not en-
abled, the thermistor is sampled for 150µs approximately
every 150ms. The thermistor data available to the I2C port
is updated at the end of each sample period.
POWER AVAILABLE
CLEAR EVENT TIMER
INDICATE CHARGING
YES
NTC OUT-OF-RANGE
BAT < 2.85V
NO
BATTERY STATE
BAT > VFLOAT – E
CHARGE WITH
103V/RPROG
2.85V < BAT < VFLOAT – E
CHARGE WITH
CONSTANT-CURRENT
CHARGE WITH
FIXED VOLTAGE
RUN EVENT TIMER
PAUSE EVENT TIMER
RUN EVENT TIMER
INHIBIT CHARGING
PAUSE EVENT TIMER
INDICATE NTC FAULT
NO
TIMER > 30 MINUTES
YES
INHIBIT CHARGING
INDICATE BATTERY FAULT
NO
BAT > 2.85V
YES
BAT RISING
YES
THROUGH VRECHRG
NO
BAT FALLING
YES
THROUGH VRECHRG
SAFETY TIMER
NO
EXPIRED
YES
STOP CHARGING
INDICATE CHARGING
STOPPED
NO
BAT < VRECHRG
NO
YES
Figure 4. Battery Charger Flow Chart
IBAT < C/x
NO
YES
INDICATE C/x REACHED
4099 F04
4099fd
19
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