LT1764-1.8 has the same input and output

Hi,

    I design a 1.8V power supply module with LT1764-1.8, and the input voltage is 12V.

   The VIN pin and SHDN pin are connected together and they share a 10uF Capacitance.

   The OUT and SENSE  are connected together and they share a 10uF Capacitance.

   But the output voltage is 12V, the same to the input voltage, rather than 1.8V.

   Which kind of reasons will cause this problem?

   Is it possible there's problem with PCB design?

  Thanks, regards.