BQ25050 Datasheet, PDF (20/28 Pages) Texas Instruments – 1A, Single-Input, Single Cell Li-Ion Battery Charger with 50-mA LDO, External Power Path

bq25050
SLUSA33 – MARCH 2010
www.ti.com
Thermal Regulation and Thermal Shutdown
The bq25050 contains a thermal regulation loop that monitors the die temperature continuously. If the
temperature exceeds T_J(REG), the device automatically reduces the charging current to prevent the die
temperature from increasing further. In some cases, the die temperature continues to rise despite the operation
of the thermal loop, particularly under high V_IN conditions. If the die temperature increases to T_J(OFF), the IC is
turned off. Once the device die temperature cools by T_J(OFF-HYS), the device turns on and returns to thermal
regulation. Continuous over-temperature conditions result in the pulsing of the load current. If the junction
temperature of the device exceeds T_J(OFF), the charge FET is turned off. The FET is turned back on when the
junction temperature falls below T_J(OFF) – T_J(OFF-HYS).
Note that these features monitor the die temperature of the bq25050. This is not synonymous with ambient
temperature. Self heating exists due to the power dissipated in the IC because of the linear nature of the battery
charging algorithm.
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