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TPS53355 / thermal and SOA information

Ryuji
Guru 20090 points
Other Parts Discussed in Thread: TPS53355, TPS53355EVM-743
Hello,
 
Please see the attached file as my questions about TPS53355.
Could you please reply to these questions ?
 
My questions are  as following.
 
-Question 1 : about max temperature
There is the thermal image In the TPS53355EVM-743 user's guide.
In this image, 88.6degree as the maximum temperature.
Is this temperature case temperature of  TPS53355?
 
-Question 2 : boards condition of SOA
In the TPS53355 datasheet P.14 , there are safe operating area figures.
Could you please let me know the layer structure  of this data?
Is this same boards with EVM ?
 
-Question 3 : SOA for our customer condition
Could Please let me know the safe operating are information for below conditions ?
Vin:0.9V and 1.5V, Layer structure: 2 layer (Top layer and Power GND layer)
Without Airflow
If there is no data, please let me know the any document for estimation.
 
Best Regards,
Ryuji Asaka