The Design of A Startup Circuit for Very Low Input Voltage BOOST DC-DC Converter
XU Xiao-lin · Computer Knowledge and Technology · 2007
Based on the trait of bootstrapped for capacitor,a startup circuit is proposed according to the principles of BOOST DC-DC converter,whose input voltage can reach 0.48V.Two oscillators are needed in order to reduce wastage of the circuit.Output of the one with high frequency is used to control the voltage boosted in the beginning of the course,and output of the other one with relative low frequency is used to control the switch in the boost circuit.At the same time,oscillators are both the ring oscillators which can be worked under low voltage.They have simple topologies,and they can be easily integrated.This circuit is designed on the base of the model of BL 0.6μm CMOS process,and its performance has been verified by simulation.