Texas Instruments TPS2543EVM, User Manual, Page: 2 / 21

Description
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1 Description
The TPS2543EVM allows reference circuit evaluation of the TI TPS2543 USB charging port power switch
and controller.
1.1 Features
• USB Charging Port Power Switch and Controller
• Meets Battery Charging Specification BC1.2 for DCP and CDP
•
Meets Chinese Telecommunications Industry 2.0 Standard YD/T 1591-2009
• Compatible With USB 2.0 and 3.0 Power Switch Requirements
• Adjustable Current Limit, 230 mA – 2800 mA Typical
• Fast Overcurrent Response – 1.5 μ s Typical
• 73-m Ω High-Side MOSFET
• 2.6-GHz Bandwidth USB 2.0 Data Switch
• EVM supports USB 3.0 data passthrough
1.2 Applications
• USB Ports/Hubs
• Notebook PCs
1.3 Glossary of Terms
• Charging downstream port (CDP)
–
A downstream port that complies with the USB 2.0 definition of a host or a hub, and additionally
defines a handshake on DP/DM to identify a BC 1.1 compliant host to a BC 1.1 compliant portable
device
– BC 1.1 allows a high-speed portable device to draw 900 mA and low-speed or full-speed device to
draw 1500 mA
– BC 1.2 intention is to allow all devices to draw 1500 mA
– BC 1.2 corrects BC 1.1 to ensure USB host provides 5 V at > 1500 mA
• Standard downstream port (SDP)
–
USB 2.0 defined port currently adopted by most USB ports
– Portable device is allowed to draw 100 mA initially and request additional current over USB
communications in 100-mA steps up to a maximum of 500 mA
– USB host required to provide at least 500 mA at 5 V
– Portable device must draw less than 2.5 mA when in USB Suspend due to the absence of USB
communication
• Dedicated charging port (DCP) as defined in BC 1.1
– BC 1.1 defines a dedicated charging port as a downstream port on a device that outputs power
through a USB connector, but is not capable of enumerating a downstream device.
– Wall adapter must source between 500 mA and 1500 mA.
– Portable device may attempt to draw 1800 mA in order to force the wall adapter into
constant-current mode.
– BC 1.2 intention is to allow DCP to current limit above 1800 mA
• YD/T 1591-2006, updated 2009
–
PROC Telecommunications Standard
– Defines wall-adapter requirements
– Rated current between 500 mA – 1500 mA with defined I-V curve
2 TPS2543EVM User ' s Guide SLVU660 – February 2012
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