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| BQ24075T Datasheet, PDF (21/29 Pages) Texas Instruments – 1.5A USB-Friendly Li-Ion Battery Charger and Power-Path Management IC | |||
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www.ti.com
PRECHARGE
THERMAL
REGULATION
CC FAST
CHARGE
CV TAPER
VO(REG)
IO(CHG)
Battery Voltage
Battery Current
bq24075T
bq24079T
SLUS937 â DECEMBER 2009
DONE
V(LOWV)
I(PRECHG)
I(TERM)
HI-z
TJ(REG)
IC Junction Temperature, TJ
Figure 29. Charge Cycle Modified by Thermal Loop
BATTERY PACK TEMPERATURE MONITORING
The bq2407xT features an external battery pack temperature monitoring input. The TS input connects to the NTC
thermistor in the battery pack to monitor battery temperature and prevent dangerous over-temperature
conditions. During charging, the voltage at TS is continuously monitored. If, at any time, the voltage at TS is
outside of the operating range (VCOLD to VHOT), charging is suspended. The timers maintain their values but
suspend counting. When the voltage measured at TS returns to within the operation window, charging is
resumed and the timers continue counting. When charging is suspended due to a battery pack temperature fault,
the CHG output remains low and continues to indicate charging.
R6 =
VIN
VCOLD
-1
1
1
R7 + RCOLD
(1)
Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): bq24075T bq24079T
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