The present invention discloses an integrated device with AC to DC conversion function, and an integrated circuit using the device. The integrated circuit comprises: a circuit operating under low DC voltage; and an integrated device with AC to DC conversion function, the device including first, second, third and fourth diodes, wherein the first diode has a cathode coupled to an anode of the second diode at a first node which receives an input of an AC voltage; the third diode has a cathode coupled to an anode of the fourth diode at a second node which receives another input of the AC voltage; the first diode has an anode coupled to an anode of the third diode at a third node which provides a low level of a DC voltage; and the second diode has a cathode coupled to a cathode of the fourth diode at a fourth node which provides a high level of the DC voltage.