TPS22981

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community TPS22981 SLVSBM6B – DECEMBER 2012 – REVISED NOVEMBER 2015 TPS22981 3.3-V to 18-V Thunderbolt™ Power Mux 1 Features 1 Powered from 3.3 V 4.5-V to 19.8-V High-Voltage Switch 3-V to 3.6-V Switch Adjustable Current Limit Thermal Shutdown Make Before Break Switch High-Voltage Discharge Before Low-Voltage Make Reverse Current Blocking 2 Applications Notebook Computers Desktop Computers Power Management Systems Typical Application connector RSVD OUT GND OUT HV_EN DC/DC ENHVU S0 V3P3OUT V3P3 ISET_S0 ISET_S3 Exposed Pad ISET_V3P3 VHV RSET_S0 RSET_S3 RSET_V3P3 V3P3 VHV DC/DC GND GND GND FAULTZ EN µC 3 Description The TPS22981 device is a current-limited power mux providing a connection to a peripheral device from either a low-voltage supply (3 V to 3.6 V) or a highvoltage supply (4.5 V to 19.8 V). 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 TPS22981 will control the switch to maintain the current at this limit. When the high-voltage supply is not present, the TPS22981 will maintain the connection to the output from the low-voltage supply. Upon the presence of a high-voltage line and high-voltage enable signal, the high-voltage switch is turned on in conjunction with the low-voltage switch until a reverse current...