As given in Section 7.4, the thermal resistance of TPS6040x is: RΘJA = 221°C/W.
The terminal resistance can be calculated using the following equation:
TJ is the junction temperature. TA is the ambient temperature. PD is the power that is dissipated by the device.
The maximum power dissipation can be calculated using the following equation:
The maximum power dissipation happens with maximum input voltage and maximum output current.
At maximum load the supply current is 0.7 mA maximum.
With this maximum rating and the thermal resistance of the device on the EVM, the maximum temperature rise above ambient temperature can be calculated using the following equation:
This means that the internal dissipation increases TJ by <10°C.
The junction temperature of the device shall not exceed 125°C.
This means the IC can easily be used at ambient temperatures up to: