1 Features
1• 4.5-V to 6.5-V Operating Range
• 47-mΩ (typical) High-Side MOSFET
• 3-A Maximum Continuous Output Current
• ±5% CS Output for Cable Compensation
• CDP Mode per USB Battery Charging
Specification 1.2
• Automatic DCP Modes Selection:
– Shorted Mode per BC1.2 and YD/T 1591-2009
– 2.7-V Divider 3 Mode
– 1.2-V Mode
• D+ and D– Client Mode for System Update
• D+ and D– Short-to-VBUS Protection
• D+ and D– ±8-kV Contact and ±15-kV Air
Discharge ESD Rating (IEC 61000-4-2)
• UL Recognition and CB Certification Pending
• –40°C to 125°C Junction Operating Temperature
• 16-Pin QFN (3-mm × 3-mm) Package

2 Applications
• USB Ports (Host and Hubs)
• Wall Charging Adapters
• Aftermarket Automotive Chargers

3 Description
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 communication.
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 connection.
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–.