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LM5166: LM5166DRCR DC-DC 5V can't output

Part Number: LM5166

Tool/software:

The LM5166DRCR is not outputting 5.0V as per the typical circuit schematic of the IC. The output is only about 1.28V. I have replaced the inductor, FB feedback resistor, SS capacitor, and RT resistor, but it still doesn't work. Please help me understand what's going on!

IC typical circuit

schematic

PCB Layout