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TPS61220: Pass-Through Function

Part Number: TPS61220

Tool/software:

Dear TI Engineer,

We have some question about the Pass-Through Function of TPS61220. Now we want to set the output voltage to 2.1V, and when the input voltage is range from 2.1V to 2.7V,  will it enter the bypass 100% duty cycle mode? If it can be achieved, what is the efficiency at this time? The output load is1.5mA.

From the datasheet we can learned that it supports the Pass-Through Function during Shutdown. But what I understand is that if it is in shutdown mode, there will be no output at the VOUT pin, at this point, Pass Through Function is meaningless.

Thanks,

Kind Regards