Abstract: An on-chip voltage reference with a wide supply voltage range is required by some applications,especially that of power management (PM) controller chips applied to telecommunication,automotive,lighting equipment,etc.,when high power supply voltage is needed.Accordingly,a new bandgap reference with a wide supply voltage range is proposed.Due to the improved structure,it features a high power supply rejection ratio (PSRR) and high temperature stability.In addition,an auxiliary micro-power reference is introduced to support the sleep mode of the PM chip and reduce its standby power consumption.The auxiliary reference provides bias currents in normal mode and a 1.28V reference voltage in sleep mode to replace the main reference and save power.Simulation results show that the reference provides a reference voltage of 1.27V,which has a 3.5mV drift over the temperature range from -20 to 120℃ and 56μV deviation over a supply voltage range from 3 to 40V.The PSRR is higher than 100dB for frequency below 10kHz.The circuit was completed in 1.5μm BCD (Bipolar-CMOS-DMOS) technology.The experimental results show that all main expectations are achieved.

Key words: wide supply voltage range, bandgap reference, line regulation, sleep mode, micro power