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TLV61220: TLV61220

Part Number: TLV61220
Other Parts Discussed in Thread: TPS61260

Dear TI 

I have a problem using TLV61220

1) Design :

            Input Voltage : 4V

           Output Voltage  : 5V

2) Test Result

    Vin and Enable Low(ground or open) => Vout 3.8V

    Vin and Enable High => Vout 5V

3) Question 

   Could you help me this problem ? in case Enable is Low, why Vout is 3.8V?