Standby current problem

Now I am making a DIY board whose power part requires less than 10uA of quiescent current.
So I used HT7333 , however, when the load powered by the HT7333 starts to operate, the HT7333 gets hot. This occurs because more current flows than the HT7333. Which device should be used instead of HT7333 to ensure low quiescent current and less heat?
The requirements are summarized as follows.
The inlet voltage of the power stage is 9 ~ 12V, the outlet voltage is 3.3V, the standby current is less than 10uA, and the operating current is 500 ~ 800mA.