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1 Description
The TPS2540EVM-623 allows reference circuit evaluation of the TI TPS2540/40A and TPS2541/41A USB
charging port power switch and controller. TPS2540EVM-623 orderable configuration is equipped with
TPS2540RTE but the TPS2540A or TPS2541/41A may also be evaluated by replacing U1 with the
appropriate device.
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 Over-current Response – 1.5 μS Typical
• 73-mΩ High-Side MOSFET
• 2.6-GHz Bandwidth USB 2.0 Data Switch
• OUT Discharge Through CTLx=000 (TPS2540/40A) or DSC (TPS2541/41A)
• Longer Detach Detection Time (TPS2540A/41A) Supporting Additional Legacy Devices
1.2 Applications
• USB Ports/Hubs
• Notebook PCs
1.3 Glossary of Terms
• Charging Downstream Port (CDP)
– Downstream port 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 high-speed portable device to draw 900mA and low-speed or full-speed device to
draw 1500mA
– BC 1.2 intention is to allow all devices to draw 1500mA
– BC 1.2 corrects BC 1.1 to ensure USB Host provides 5V at >1500mA
• Standard Downstream Port (SDP)
– USB 2.0 defined port currently adopted by most USB ports
– Portable device is allowed to draw 100mA initially and request additional current over USB
communications in 100mA steps up to a maximum of 500mA
– USB Host required to provide 5V at >500mA
– Portable device must not draw >2.5mA when not USB in Suspend due to lack of USB
communication
• Dedicated Charging Port 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 500mA and 1500mA
– Portable Device may attempt to draw 1800mA in order to force the wall adapter into constant
current mode
– BC 1.2 intention is to allow DCP to current limit >1800mA to allow IC power switch device
• YD/T 1591-2006, updated 2009
– PROC Telecommunications Standard
– Defines wall-adapter requirements
– Rated current between 500mA – 1500mA w/ defined I-V curve
2
TPS2540EVM-623: Evaluation Module for TPS2540/40A and TPS2541/41A SLVU401B–September 2010–Revised August 2011
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