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TPS61088: when the enable pin of TPS61088 is low, why the output voltage is not shutdown

Part Number: TPS61088

Hello sir

  When I use TPS61088, input voltage is 7.92V. when the enable pin is high,the output voltage is 12V.  this is right.

 But when the enable pin is low, the output voltage is  7.63V which is expected to be zero. why does this happenned?