A Low-Voltage and Low-Power Bandgap Voltage Reference for DC/DC Converters
Jiangtao Xu · 2007
A high-precision,low-voltage and low-power bandgap voltage reference source for boost DC/DC converters is presented,which contains a constant current bias circuit,a low-voltage and low-power op-amp,a bandgap reference core with BJT cascaded,and a low-voltage start-up circuit.After theoretical analysis and simulation,the circuit was fabricated in Huahong-NEC's 5 V 0.35 μm 1P4M dual-well CZ6 process.Test results show that the circuit has an output voltage of 1.2 V and a temperature coefficient of 12.5 ppm/℃.Operating from 1.3 V to 5 V supply power,the circuit consumes 14 μA of power at 3 V supply with variation rate of 0.78 mV/V.