BQ25601 Datasheet, PDF (21/60 Pages) Texas Instruments – I2C Controlled 3-A, Single-Cell Battery Charger for High Input Voltage and Narrow Voltage DC (NVDC) Power Path Management

bq25601
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SLUSCK5 – MARCH 2017
When a full battery voltage 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.
8.4.7.2 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 3. 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 11. Battery Charging Profile
Top-off Timer Safety Timer
(optional)
Expiration
8.4.7.3 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.
When termination occurs, the status register CHRG_STAT is set to 11, and an INT pulse is asserted to the host.
Termination is temporarily disabled when the charger device is in input current, voltage or thermal regulation.
Termination can be disabled by writing 0 to EN_TERM bit prior to charge termination.
Copyright © 2017, Texas Instruments Incorporated
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