BQ25600 Datasheet, PDF (25/66 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
Equation 1 through Equation 2 describe updates to the resistor bias network.
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:
• RTH_COLD = 27.28 KΩ
• RTH_HOT = 3.02 KΩ
• RT1 = 5.23 KΩ
• RT2 = 30.9 KΩ
7.3.7.6 Boost Mode Thermistor Monitor during Battery Discharge Mode
For battery protection during boost mode, the device monitors the battery temperature to be within the VBCOLD
to VBHOTthresholds. 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.
V_REGN
Temperature Range to Boost
V_BCOLD
(±10°C)
Boost Disabled
V_BHOT
(65°C)
Boost Enabled
AGND
Boost Disabled
Figure 15. TS Pin Thermistor Sense Threshold in Boost Mode
7.3.7.7 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 and 10 hours when the battery is higher
than 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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