BQ24297 Datasheet, PDF (29/48 Pages) Texas Instruments – I2C Controlled 3A Single Cell USB Charger

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bq24297
SLUSBP6A – SEPTEMBER 2013 – REVISED OCTOBER 2013
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 29. 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 is suspended and REG08[7:6] bits
(VBUS_STAT) are set to 00. Once temperature returns within thresholds, the boost mode is recovered.
REGN
bq24296
bq24297
TS
RT1
RT2
RTH
103AT
Figure 30. TS Resistor Network
Copyright © 2013, Texas Instruments Incorporated
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