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–.