bq25505
SLUSBJ3B –AUGUST 2013–REVISED JANUARY 2014
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The bq25505 uses an integrated temperature sensor to monitor the junction temperature of the device. The
temperature threshold for thermal protection is set to 125°C. Once the temperature threshold is exceeded, the
boost charger is disabled and charging ceases. Once the temperature of the device drops below this threshold,
the boost charger and buck converter resumes operation. To avoid unstable operation near the overtemp
threshold, a built-in hysteresis of approximately 5°C has been implemented. Care should be taken to not over
discharge the battery in this condition since the boost charger is disabled. However, if the supply voltage drops to
the VBAT_UV setting, then the switch between VBAT_SEC and VSTOR will open and protect the battery even if
the device is in thermal shutdown.
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