BQ25606 Datasheet, PDF (19/43 Pages) Texas Instruments – Standalone 3.0-A, Single Cell Battery Charger With 40V Over Voltage Protection Controller

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SLUSCK6 – MAY 2017
Table 3. Charging Parameter Default
Setting (continued)
Default Mode
Temperature profile
Safety timer
bq25606
JEITA
10 hours
A new charge cycle starts when the following conditions are valid:
• Converter starts
• Battery charging is enabled (CE is low)
• No thermistor fault on TS
• No safety timer fault
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 , the device automatically starts a new
charging cycle. After the charge is done, toggle CE pin 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).
8.3.6.2 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.
8.3.6.3 Thermistor Qualification
The charger device provides a single thermistor input for battery temperature monitor.
8.3.6.4 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), the charge current is reduced to 20% of programmed fast charge current. At warm
temperature (T3-T5), the charge voltage is reduced to 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).
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