MAX25207
Production
The MAX25206/MAX25207/MAX25208 are automotive 2.2MHz synchronous step-down controllers with 7µA IQ. These devices operate with an input voltage supply...
Datasheet
MAX25207 on Analog.com
HI
I want use MAX25207 in the new design,the power is DC12V---MAX25207 --3.6V/11A. but i need the Cold Crank Input Voltage is 4V, it means When the System start, Input Voltage from 12V to 4V,and the time of duration is 40ms. the MAX25207 need out put 3.6V/11A.
MAY I ask ,
1. Can the MAX25207 achieve this function?
2. Could you please tell me how to calculate whether this function can be implemented?
3. Could I simulate CRANK TEST?

The MAX25207 maybe can't achieve your function. As bellow, when add no load and with crank test, the out voltage will drop follow up the vin. if you add load, the output voltage will drop heavily.
If you want to test it, you can use the EVB of MAX25207. The link is: MAX25207EVKIT Evaluation Kit for the MAX25207 | Analog Devices