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譬如输出电压要求是-5.7V~-4.3V，电流1MA，而输入的电压可能比-5.7V还小，会是-10V之类的，一旦超过了限定值就必须自动断开，能够经受的住长时间的反复关断打开。
Hi
用LDO就可以做，例如TPS7A3401.
保护可以用比较器来做，超过范围就通过LED EN 关掉芯片。
谢谢您的指导，非常感谢！
