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TPS61081: TPS61081's input and output voltage was incorrectted

Part Number: TPS61081

Hello

input voltage is 3.3V, when add 3.3V connect to VDD3V3(PIN 2), TPS61081 ouput voltage should be 7.65V normally, but actually output voltage just 1.4V, and strange thing is voltage on VDD3V3(PIN2) also change to 1.65V. when I disconnect input and VDD3V3(PIN2), the input voltage is 3.3V,this input is no problem.

Since this device have overcurrent and short circuit protection,this phenomenon don't like caused by overload and output short