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TPS2547: TPS2547 doesn't charge iPhone in system S3 SDP mode

Part Number: TPS2547

Hi team,

My customer reported an issue that may need your help to clarify. 

In the notebook application with TPS2547, the system is able to charge the iPhone in system S0 with SDP. But if turn down the system to S3/S4 status, iphone could not be charged any more in SDP mode. Is this an expected behavior?

Please let me know if you have some docs explaining this, and help to mail it to me if possible.

Thanks

Max