| With the concept of switching power supply proposed in the last century,BOOST type DC-DC converter has been widely used in various electronic devices.As one of the most important modules in most electronic equipment,power module is an important part of system design.The improvement of its parameter characteristics plays a very important role in the performance optimization of the whole electronic equipment.The miniaturization and portability of electronic equipment is the inevitable trend of social development.Low-power power module can improve the system life and reduce the overall power consumption of the system.At the same time,the world energy crisis is approaching,which creates a wide market for low-power equipment.In today’s China,responding to the government’s call for energy conservation and emission reduction is popular among the people,and the low-power design of power module has become a hot research topic of chip.Thesis comprehensively analyzes the principle of boost converters,under the premise that chips are mainly used in miniaturized devices such as Bluetooth,smartphones,and smart watches.Reduce power consumption by replacing the diodes of conventional boost converters by integrating synchronous rectification MOS transistors in the chip,as well as analysis of converters and synchronous rectification principles,comparison of voltage control and current control,and improve conversion efficiency by rationally selecting control modes Analysis of the stability of the two-loop of current mode control to demonstrate the validity of this study.Finally,combined with market cost and technical limitations,a DC-DC synchronous rectification boost converter based on peak current mode control is proposed that can be applied to a variety of complex scenarios.In thesis,a reasonable exhaustion reference module,error amplifier module,oscillation module,etc.are designed to achieve chip functions and low power consumption requirements and maintain system stability through protection modules such as over-temperature protection,over-current protection,under-voltage latching,and short-circuit protection.Compared with the traditional bandgap reference source,this paper uses a new depletion reference source to reduce the power consumption brought by the reference module,and designs a novel short-circuit protection circuit to provide protection for the system.Finally,the 0.35μm BCD process is used in the cadence module to simulate the design circuit as a whole and the whole simulation,and the layout design.The simulation results show that output voltages up to 6.5 V can be regulated with input voltages of 2 V to 5 V,and quiescent power consumption as low as 13.47 μA at no load,the chip footprint is 860μm × 550μm and the conversion efficiency is up to 93.5%.Theoretical analysis and experimental results prove the feasibility and effectiveness of the system. |
