The TPS2549 device is a USB charging port controller and power switch with a
current-sense output that is able to control an upstream supply. This allows it to maintain 5 V at
the USB port even with heavy charging currents. This is important in systems with long USB cables where
significant voltage drops can occur while fast-charging portable devices.
The TP2549 47-mΩ power switch has two selectable, programmable current limits that
support port power management by providing a lower current limit that can be used when adjacent
ports are experiencing heavy loads. This is important in systems with multiple ports and an
upstream supply unable to provide full current to all ports simultaneously.
The DCP_Auto scheme detects and selects the proper D+ and D– settings to communicate with
the attached device, so that it can fast-charge at full current. The integrated CDP detection
enables up to 1.5-A fast charging of most portable devices with simultaneous data
The unique client-mode feature allows software updates to client devices, but avoids
power conflicts by turning off the internal power switch while keeping the data line
Additionally, the TPS2549 device integrates short-to-VBUS
protection for D+ and D– to prevent damage when D+ and/or D– unexpectedly short to
VBUS. To save space in the application, the TPS2549 device also integrates
ESD protection to pass IEC61000-4-2 without external circuitry on D+ and D–.
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