In high voltage wide input range chips, the high voltage power generally is not directly used as the power supply of the bandgap reference circuit. A Zener diode and source follower are always used to generate a low-voltage power supply for the bandgap in traditional scheme. However, the low-voltage power supply is fluctuated easily, which reduces the PSRR (power supply rejection ratio) of the bandgap. When the power supply of the bandgap is generated by the feedback loop, the reference may obtain a high PSRR performance. In this paper, a bandgap circuit with a wide input range of 5~65 V was proposed for the applications of bucks, motor drivers or analog ASIC chips. The closed-loop negative feedback circuit generated a low voltage power supply and a 1.2 V reference voltage. The power of the bandgap circuit was determined by the VGS of the PMOS, and the current of the PMOS was generated by the bandgap circuit. Therefore, the low voltage power supply made no reference to input voltage, which improved the PSRR of the reference voltage. The circuit was composed of a preprocessing circuit, a start-up circuit and a bandgap circuit. No additional mask layer and Zener diode were used in this design, which reduced the circuit cost. Under CSMC 0.25 μm BCD process, this design achieved a bandgap reference voltage which linear adjustment rate was 0.000 091%, PSRR under low frequency was -160 dB@100 Hz and the temperature coefficient was 2.8×10-5/℃. The reference voltage variation was less than 1 μV when input voltage varied in the range of 5~65 V.