USB Charging Port Controller and Power Switch

USB Charging Port Controller and Power Switch - TPS2549


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–.


  • 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

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Parametrics Compare all products in USB Charging Port Controllers

Vin (Min) (V)
Vin (Max) (V)
Number of Switches
Continuous Current (Max) (A)
Current Limit (A)
rDS(on) per FET (Typ) (mOhms)
Current Limit Accuracy @ 1A
Operating Temperature Range (C)
Fault Response
TPS2549 TPS2511 TPS2543 TPS2544 TPS2546 TPS2547 TPS2549-Q1
4.5    4.5    4.5    4.5    4.5    4.5    4.5   
6.5    5.5    5.5    5.5    5.5    5.5    6.5   
1    1    1    1    1    1    1   
Active High    Active High    Active High    Active High    Active High    Active High    Active High   
3    2.7    2.5    2.5    2.7    3.0    3.2   
0.25 to 3.4    0.25 to 2.7    0.25 to 2.7    0.2 to 2.7    0.2 to 2.5    0.2 to 3.0    0.25 to 3.6   
47    70    75    73    73    73    47   
10%    +/-10%    10%    10%    +/-10%    +/-10%    10%   
Catalog    Catalog    Catalog    Catalog    Catalog    Catalog    Automotive   
-40 to 125    -40 to 85    -40 to 125    -40 to 125    -40 to 125    -40 to 115    -40 to 85   
Retry    Retry    Retry    Retry    Retry    Retry    Retry   
16WQFN    8MSOP-PowerPAD    16WQFN    16WQFN    16WQFN    16WQFN    16WQFN   

Other qualified versions of TPS2549

Version Part Number Definition
Automotive TPS2549-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects