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TPS552892-CALCULATION-TOOL: Simulation Issues

Part Number: TPS552892-CALCULATION-TOOL
Other Parts Discussed in Thread: TPS552892, TPS55285

Hi, 

When i simulate this with 3 to 18V input to output 3.8V 5A, it generates a recomanded schematics. However, when I want to input 4 to 5V with 3.8V with 5A output it says the design cannot work with these input parameters. 
is this a simulation issue or are these input and output parammeters not possible with this device?

Thank you 

Vedat Cavlu