MCP1603 可以看看这个芯片的演示版，正好是3色LED http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1406&dDocName=en530521 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.
Compact size and low profile 500 mA converter design Wide input voltage range: 2.7V to 5.5V Five different output voltage setting: 0.8V, 1.2V, 1.8V, 2.5V, 3.3V Test points for connecting input voltage source and external load
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