BQ25600 Datasheet, PDF (23/66 Pages) Texas Instruments – I2C Controlled 3.0-A, Single Cell Battery Charger With up-to 40-V Overvoltage Protection Controller for High-Input Voltage and Narrow Voltage DC (NVDC) Power Path Management

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bq25600, bq25600D
SLUSCJ4 – JUNE 2017
The charger device automatically terminates the charging cycle when the charging current is below termination
threshold, battery voltage is above recharge threshold, and device not is in DPM mode or thermal regulation.
When a fully charged battery is discharged below recharge threshold (selectable through VRECHG bit), the
device automatically starts a new charging cycle. After the charge is done, toggle CE pin or CHG_CONFIG bit
can initiate a new charging cycle.
The STAT output indicates the charging status: charging (LOW), charging complete or charge disable (HIGH) or
charging fault (Blinking). The STAT output can be disabled by setting EN_ICHG_MON bits = 11. in addition, the
status register (CHRG_STAT) indicates the different charging phases: 00-charging disable, 01-precharge, 10-fast
charge (constant current) and constant voltage mode, 11-charging done. Once a charging cycle is completed, an
INT is asserted to notify the host.
7.3.7.2 Battery Charging Profile
The device charges the battery in five phases: battery short, preconditioning, constant current, constant voltage
and top-off trickle charging (optional). At the beginning of a charging cycle, the device checks the battery voltage
and regulates current and voltage accordingly.
Table 5. Charging Current Setting
V_BAT
< 2.2 V
2.2 V to 3 V
>3V
CHARGinG CURRENT
I_SHORT
I_PRECHG
I_CHG
REGISTER DEFAULT
SETTinG
100 mA
180 mA
2.048 A
CHRG_STAT
01
01
10
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
VREG[7:3]
Charge Current
ICHG[5:0]
VBATLOWV (3 V)
Battery Voltage
Charge Current
VSHORTZ (2.2 V)
IPRECHG[7:4]
ITERM[3:0]
ISHORT
Trickle Charge Pre-charge
Fast Charge and Voltage Regulation
Figure 12. Battery Charging Profile
Top-off Timer Safety Timer
(optional)
Expiration
7.3.7.3 Charging Termination
The device terminates a charge cycle when the battery voltage is above recharge threshold, and the current is
below termination current. After the charging cycle is completed, the BATFET turns off. The converter keeps
running to power the system, and BATFET can turn on again to engage Supplement Mode.
Copyright © 2017, Texas Instruments Incorporated
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