BQ25600 Datasheet, PDF (24/66 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

bq25600, bq25600D
SLUSCJ4 – JUNE 2017
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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.
At low termination currents (25 mA-50 mA), due to the comparator offset, the actual termination current may be
10 mA-20 mA higher than the termination target. in order to compensate for comparator offset, a programmable
top-off timer can be applied after termination is detected. The termination timer will follow safety timer
constraints, such that if safety timer is suspended, so will the termination timer. Similarly, if safety timer is
doubled, so will the termination timer. TOPOFF_ACTIVE bit reports whether the top off timer is active or not. The
host can read CHRG_STAT and TOPOFF_ACTIVE to find out the termination status.
Top off timer gets reset at one of the following conditions:
1. Charge disable to enable
2. Termination status low to high
3. REG_RST register bit is set
The top-off timer settings are read in once termination is detected by the charger. Programming a top-off timer
value after termination will have no effect unless a recharge cycle is initiated. An INT is asserted to the host
when entering top-off timer segment as well as when top-off timer expires.
7.3.7.4 Thermistor Qualification
The charger device provides a single thermistor input for battery temperature monitor.
7.3.7.5 JEITA Guideline Compliance During Charging Mode
To improve the safety of charging Li-ion batteries, JEITA guideline was released on April 20, 2007. The guideline
emphasized the importance of avoiding a high charge current and high charge voltage at certain low and high
temperature ranges.
To initiate a charge cycle, the voltage on TS pin must be within the VT1 to VT5 thresholds. If TS voltage exceeds
the T1-T5 range, the controller suspends charging and waits until the battery temperature is within the T1 to T5
range.
At cool temperature (T1-T2), JEITA recommends the charge current to be reduced to half of the charge current
or lower. At warm temperature (T3-T5), JEITA recommends charge voltage less than 4.1 V.
1The charger provides flexible voltage/current settings beyond the JEITA requirement. The voltage setting at
warm temperature (T3-T5) can be VREG or 4.1V (configured by JEITA_VSET). The current setting at cool
temperature (T1-T2) can be further reduced to 20% of fast charge current (JEITA_ISET).
100
90
80
70
60
50
ISET = 0
V_REG
4.1
VSET = 0
40
30
20
ISET = 1
VSET = 1
10
0
T1
T2
T3
T5
0
T1
T2
T3
T5
±5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70
Junction Temperature (°C)
Figure 13. JEITA Profile: Charging Current
±5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70
Junction Temperature (°C)
Figure 14. JEITA Profile: Charging Voltage
24
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