SDAA142A November 2025 – July 2026 BQ25172
The BQ25172 is a linear regulator has high power dissipation when the voltage drop across the device is large. When charging a depleted battery with low voltage, power dissipation on the charger is at the highest. Higher current increases power dissipation.
The BQ25172 manages power dissipation using a thermal regulation feature which monitors die temperature and reduces output current below programmed value to control temperature. The charge continues during this condition and timer clock rate is reduced by half.
The temperature sensor is on the die and independent of TS pin and NTC.