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输入电压+12V（或+5V），输出电压固定-5V，输出电流50mA（更大也行），要求纹波和电磁辐射低，占用面积不要太大，外围电路最好少一点，价格没有要求，哪位高手有用过的芯片请麻烦推荐几款型号，谢谢！
楼主可以参考这个帖子
- http://www.deyisupport.com/question_answer/analog/power_management/f/24/t/60239.aspx
