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USB charger chip selection (TPS2511/TPS2543/TPS2546)

Other Parts Discussed in Thread: TPS2511, TPS2543, TPS2546

Hi,

we are looking for a chip set for a USB charger and did some tests. So this is our point of view at the moment:

The TPS2511 does not support simultaneously fast charging for iPhone and iPad in DCP auto mode:

http://e2e.ti.com/support/power_management/power_interface/f/204/p/244575/857649#857649

The TPS2543 supports both, but:
The datasheet describes: "A DCP only provides power and does not provide data connection to an upstream port."

But an upstream port is needed ("need handshake or enumeration signal to complete the mode change") to support auto mode for:
http://e2e.ti.com/support/power_management/power_interface/f/204/t/335827

Without host port the output voltage toggles between 0V and 0.4V and no device will be detected.

The third option is the TPS2546 with additional DCP charge detection voltage (1.2V). This one supports fast charging for iPhone and iPad:
http://e2e.ti.com/support/power_management/power_interface/f/204/p/244575/857649#857649

By designing a USB charger (10W), we do not have any host port. Does the TPS2546 need a host port for handshaking? Or what kind of chip set is the right one?


Best regards

Markus