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TPS43330只用一路BUCK，
输入12V，
输出5V，带载2mA时，效率可以达到多少？
你好：
规格书中明确给出了效率曲线，当同步引脚为低时，效率可达80%；当同步引脚为高时，效率仅为4%左右；
详细曲线在规格书第11页。
TPS43330具有Automatic Low-Power Mode at Light Loads，所以在2mA是可以保证很高的效率
