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With the vigorous development of the information industry , the replacement transformation of traditional industries as well as continuously improve energy conservation requirements , switching power supply industry has been developing rapidly. The development of the computer equipment and efficient portable electronic products tend to miniaturization requirements ancillary smaller, lighter , more efficient power supply system . Under this premise , the design and development of high efficiency , small size of the DC - DC switching power supply chips , both from an economic point of view , or from scientific research is useful value . This topic is to research and design for high - efficiency DC-DC switching power supply , in this paper , the works of the DC-DC switching power supply design made ??a detailed analysis of the ideology and system performance , similar mature products and abroad as a reference , a DC-DC switching power supply chip design , current mode PWM control mode , the use of the core technology of the ramp compensation and synchronous rectification , integrated power MOSFET Cadence software simulation of the various modules and system performance . The subjects participated in the MPW plan on IC Design Centre (ICC) , in Wuxi CSMC 0.6um N the well CMOST Arts tapeout , and tested the chip . The test results show that the DC - DC converter output voltage ripple is only 45mV, output voltage accuracy of 1.5% , 84.2% conversion efficiency in the supply voltage 5V, 330mA load current . The chip has low voltage and high current , high efficiency and low power consumption , the external application circuit characteristics , suitable for battery-powered portable electronic products such as digital cameras, mobile phones, cameras , mp3 , etc. .
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