The TPS254900-Q1 device is a USB charging-port controller and power switch with
short-to-battery protection. This feature provides protection on OUT, DM_IN and DP_IN. These three
pins withstand voltage up to 18 V. The internal MOSFET turns off quickly when the short-to-battery
condition occurs. Rapid turnoff is very important to protect the upstream dc-dc converter,
processor, or hub data lines.
The TPS254900-Q1 45-mΩ power switch has two selectable, adjustable current limits that
support port power management by changing to a lower current limit when adjacent ports are
experiencing heavy loads. This is important in systems with multiple ports and upstream power
supplies with limited capacity.
The TPS254900-Q1 has a current-sense output that is able to control an upstream supply,
which allows it to maintain 5 V at the USB port even with heavy charging currents. This feature is
important in systems with long USB cables where significant voltage drops can occur with
fast-charging portable devices.
A current monitor allows a system to monitor the load current in real time by monitoring
the IMON voltage. The current monitor is very useful and can be used for dynamic port-power
The TPS254900-Q1 device also provides ESD protection capability per IEC 61000-4-2, level
4 on DP_IN and DM_IN.