BQ24295 Datasheet, PDF (28/45 Pages) Texas Instruments – I2C Controlled 3A Single Cell USB Charger

bq24295
SLUSBC1 – SEPTEMBER 2013
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-3008mA)
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 27. Battery Charging Profile
Safety Timer
Expiration
Thermistor Qualification
The charger device provides a single thermistor input for battery temperature monitor.
Cold/Hot Temperature Window
The device continuously monitors battery temperature by measuring the voltage between the TS pin 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 charge or boost 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.
For battery protection during boost mode, the device monitors the battery temperature to be within the VBCOLDx
to VBHOTx thresholds unless boost mode temperature is disabled by setting BHOT bits (REG06[3:2]) to 11.
When temperature is outside of the temperature thresholds, the boost mode and BATFET are disabled and
BATFET_Disable bit is set (REG07[5] bit) to reduce leakage current on PMID. Once temperature returns within
thresholds, the host can clear BATFET_Disable bit (REG07[5]) or provide logic low to high transition on QON pin
to enable BATFET and boost mode.
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