The TMI6267AH is a cost-effective, single P-MOSFET load  switch with ultra-low RDS(ON), optimized for self-powered  and bus-powered Universal Serial Bus (USB) applications.  Input voltage from 2.5V to 5.5V, making it ideal for both  3V and 5V systems. A built-in P-channel MOSFET with  true shutdown function to eliminate any reversed  current flow across the switch. When output voltage is  higher than input voltage, power switch is turned off.