Datasheet

( )
BATREG_ACTUAL BATREG_I2C CHRG_ACTUAL COMP CLAMP
V = V + lower of I × R and V
Regulation Voltage
(3.5V – 4.4V)
Fast Charge Current
(500mA-4020mA)
VBAT_LOWV (2.8V/3V)
VBAT_SHORT (2V)
IPRECHARGE (128mA-2048mA)
ITERMINATION (128mA-2048mA)
IBATSHORT (100mA)
Battery Voltage
Charge Current
Trickle Charge Pre-charge
Fast Charge and Voltage Regulation
Safety Timer
Expiration
bq24190, bq24192
bq24192I, bq24193
www.ti.com SLUSAW5A –JANUARY 2012–REVISED OCTOBER 2012
If the charger device is in DPM regulation or thermal regulation during charging, the actual charging current will
be less than the programmed value. In this case, termination is temporarily disabled and the charging safety
timer is counted at half the clock rate.
Figure 29. Battery Charging Profile
Battery Path Impedance IR Compensation
To speed up the charging cycle, we would like to stay in constant current mode as long as possible. In real
system, the parasitic resistance, including routing, connector, MOSFETs and sense resistor in the battery pack,
may force the charger device to move from constant current loop to constant voltage loop too early, extending
the charge time.
The bq24190, bq24192, bq24192I, bq24193 allows the user to compensate for the parasitic resistance by
increasing the voltage regulation set point according to the actual charge current and the resistance. For safe
operation, the user should set the maximum allowed regulation voltage to REG06[4:2], and the minimum trace
parasitic resistance (REG06[7:5]).
(1)
Thermistor Qualification
The high capacity battery usually has two or more single cells in parallel. The bq24190, bq24192, bq24192I
provides two TS pins to monitor the thermistor (NTC) in each cell independently. The bq24193 applies JEITA
profile with TS1/TS2 shorted.
Cold/Hot Temperature Window (bq24190, bq24192, bq24192I)
The bq24190, bq24192, bq24192I continuously monitors battery temperature by measuring the voltage between
the TS pins and ground, typically determined by a negative temperature coefficient thermistor and an external
voltage divider. The device compares this voltage against its internal thresholds to determine if charging is
allowed. To initiate a charge cycle, the battery temperature must be within the V
LTF
to V
HTF
thresholds. During the
charge cycle the battery temperature must be within the V
LTF
to V
TCO
thresholds, else the device suspends
charging and waits until the battery temperature is within the V
LTF
to V
HTF
range.
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Product Folder Links: bq24190 bq24192 bq24192I bq24193