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MCP1603 可以看看这个芯片的演示版，正好是3色LED<br />http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1406&dDocName=en530521<br />The MCP1603 Buck Converter Demo Board uses Microchip’s MCP1603 device in a step-down application. The evaluation board is a fully functional platform to evaluate the MCP1603 buck regulator over its entire input voltage, output voltage, and current range.<br /><br /><br /><br />Compact size and low profile 500 mA converter design <br />Wide input voltage range: 2.7V to 5.5V <br />Five different output voltage setting: 0.8V, 1.2V, 1.8V, 2.5V, 3.3V <br />Test points for connecting input voltage source and external load<br />
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