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输入10-12V的电压，输出相对应的负电压，给一个采样保持器供电，类似于lm2662这样的芯片，2662不能达到10V
看一下这个文档
输入12V，输出-12V，1.5A的。应该够用了吧
里面有原理图，BOM，测试结果等等
http://www.ti.com/tool/PMP4369?keyMatch=pmp4369&tisearch=Search-EN-Everything
