A High-Voltage High-PSRR Power Management Circuit for BMS chip of new energy vehicle

This paper presents a High-Voltage High-PSRR (HVHP) power management circuit used in high-precision battery parameters acquisition chip for Battery Management System for new energy vehicles. It consists of a pre-regulator, a high PSRR (power supply rejection ratio) self-regulated bandgap voltage reference (BGR), high voltage linear regulator, with the capability of soft start, over current detect, and power-on reset generation. The Power Management Circuit has been designed in ASMC's 0.5µm HV60 BCD automotive electronics technology. Post-layout simulation result shows it can work under input voltage from 5.5V to 40V, and deliver a current up to 20mA. BGR has a very high PSRR of −125dB@1KHz and with the regulated voltage −100dB@1KHz. This design is applicable for BMS chip and has already been taped out.