BQ24195 Datasheet, PDF (24/41 Pages) Texas Instruments – I2C Controlled 2.5A / 4.5A Single Cell USB/Adapter Charger With 5.1V at 1A / 5.1V at 2.1A Synchronous Boost Operation

bq24195
bq24195L
SLUSB97 – OCTOBER 2012
www.ti.com
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.
Regulation Voltage
(3.5V – 4.4V)
Fast Charge Current
(500mA-4020mA)
VBAT_LOWV (2.8V/3V)
Battery Voltage
Charge Current
VBAT_SHORT (2V)
IPRECHARGE (128mA-2048mA)
ITERMINATION (128mA-2048mA)
IBATSHORT (100mA)
Trickle Charge Pre-charge
Fast Charge and Voltage Regulation
Figure 19. Battery Charging Profile
Safety Timer
Expiration
Thermistor Cold/Hot Temperature Window
The bq24195L, bq24195 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.
REGN
bq24195L
bq24195
TS
RT1
RT2
RTH
103AT
Figure 20. TS Resistor Network
When the TS fault occurs, the fault register REG09[2:0] indicates the actual condition on each TS pin and an INT
is asserted to the host. The STAT pin indicates the fault when charging is suspended.
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