TPS22980
www.ti.com SLVSB61C – DECEMBER 2011 – REVISED SEPTEMBER 2013 3.3V TO 18V MUX with Overcurrent Limit
Check for Samples: TPS22980 FEATURES APPLICATIONS 1 Powered From 3.3V
4.5V to 19.8V High Voltage Switch
3V to 3.6V Switch
Adjustable Current Limit
Thermal Shutdown
Make Before Break Switch
High Voltage Discharge Before Low Voltage
Make
Reverse Current Blocking Notebook Computers
Desktop Computers
Power Management Systems DESCRIPTION
The TPS22980 is a current-limited power mux providing a connection to a peripheral device from either a low
voltage supply (3.0V up to 3.6V) or a high voltage supply (5V up to 18V). The desired output is selected by digital
control signals.
The high voltage (VHV) and low voltage (V3P3) switch current limits are set with external resistance. Once the
current limit is reached, the TPS22980 will control the switch to maintain the current at the limit.
When the high voltage supply is not present, the TPS22980 will maintain the connection to the output from the
low voltage supply. When a high voltage line and high voltage enable signal is detected by the device, the high
voltage switch will be turned on in conjunction with the low voltage switch until a reverse current is detected by
the low voltage switch. The low voltage switch is then disabled allowing a seamless transition from a low voltage
to a high voltage supply with minimal drop and shoot-through current. …
