BQ25601 Datasheet, PDF (23/60 Pages) Texas Instruments – I2C Controlled 3-A, Single-Cell Battery Charger for High Input Voltage and Narrow Voltage DC (NVDC) Power Path Management

bq25601
www.ti.com
SLUSCK5 – MARCH 2017
The resistor bias network has been updated as below.
RT2 =
V_REGN
´ RTH_COLD
´
RTH_HOT
´
æ
çè
1_-
VT1
1ö
VT5 ^÷ø
RTH_HOT
´
æ
çè
V_REGN
VT5
-
ö
1_÷ø
-
RTH_COLD
´
æ
çè
V_REGN
VT1
-
ö
1_÷ø
(1)
RT1 =
æ
ç
è
æ
çè
V_REGN
VT1
ö
÷ø
-
ö
1_÷
ø
æ
çè
1
RT2
ö
÷ø
+
æ
ç
è
1
RTH_COLD
ö
÷
ø
(2)
Select 0°C to 60°C range for Li-ion or Li-polymer battery, (Actual example is TBD based on threshold design)
• RTHT_COLD = 27.28 KΩ
• RTHT_HOT = 3.02 KΩ
• RT1 = 5.23 KΩ
• RT2 = 30.9 KΩ
8.4.7.6 Boost Mode Thermistor Monitor during Battery Discharge Mode
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 to 11. When
temperature is outside of the temperature thresholds, the boost mode is suspended. in additional, VBUS_STAT
bits are set to 000 and NTC_FAULT is reported. Once temperature returns within thresholds, the boost mode is
recovered and NTC_FAULT is cleared.
When BHOT bits are set to 11, the temperature monitor reports the NTC_FAULT, but the boost mode operation
is not suspended.
V_REGN
Temperature Range to Boost
V_BCOLDx
(-10°C / 20°C)
Boost Disabled
V_BHOTx
(55°C / 60°C / 65°C)
Boost Enabled
AGND
Boost Disabled
Figure 14. TS Pin Thermistor Sense Threshold in Boost Mode
8.4.7.7 Charging Safety Timer
The device has built-in safety timer to prevent extended charging cycle due to abnormal battery conditions. The
safety timer is 2 hours when the battery is below V_BATLOWV threshold. The user can program fast charge safety
timer through I²C (CHG_TIMER bits). When safety timer expires, the fault register CHRG_FAULT bits are set to
11 and an INT is asserted to the host. The safety timer feature can be disabled through I²C by setting
EN_TIMER bit.
During input voltage, current, JEITA cool or thermal regulation, the safety timer counts at half clock rate as the
actual charge current is likely to be below the register setting. For example, if the charger is in input current
regulation (IDPM_STAT = 1) throughout the whole charging cycle, and the safety time is set to 5 hours, the
safety timer will expire in 10 hours. This half clock rate feature can be disabled by writing 0 to TMR2X_EN bit.
During the fault, timer is suspended. Once the fault goes away, fault resumes. If user stops the current charging
cycle, and start again, timer gets reset (toggle CE pin or CHRG_CONFIG bit).
Copyright © 2017, Texas Instruments Incorporated
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