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升压芯片TPS61221功耗太大,怎么回事?

Other Parts Discussed in Thread: TPS61221, TPS61098

TPS61221芯片手册中可以得知,其效率在95%左右,直接输出3.3V电压,现在负载电路要求18uA的电流,TPS芯片输入电流大约在36uA左右,怎么效率只有一半?参考电路按照手册电路给出,测量方法是在2节1.5V电池串联2欧姆电阻接到Vin,用电压表测量电阻电压,难道是TPS61221输入电阻太小?