ZHCSGK9B April 2017 – December 2017 TPS22971
PRODUCTION DATA.
9.1.1 Thermal Consideration
It is recommended to limit the junction temperature (TJ) to below 125°C. To calculate the maximum allowable dissipation, PD(max) for a given output current and ambient temperature, use Equation 6 as a guideline:
Equation 6. 
where
- PD(max) is maximum allowable power dissipation
- TJ(max) is maximum allowable junction temperature
- TA is ambient temperature of the device
- ΘJA is junction to air thermal impedance. See the Thermal Information section. This parameter is highly dependent upon board layout