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LM2733不能彻底关断

Other Parts Discussed in Thread: LMR62014, LM2733, TLV61046A, TPS61046

在使用LM2733时,输入电压的5.6-8.4V的两节串联锂离子电池,想输出稳压的12V,当输入8.4V时,4脚高电平,输出12.3正常,当4脚为低电平时,仍然还有电压,输出,能否4脚为电平,输出为零伏。我感觉此类芯片不能彻底关断。4脚的功能如何理解。类似的芯片LMR62014。见下图。