USB charging controller in a SOT-23-6
The Texas Instruments TPS2514ADBVT is a USB Dedicated Charging Port (DCP) controller and power switch integrated into a single SOT-23-6 package. It handles the handshake logic that tells a connected portable device it can draw higher current from a dedicated charger port, and switches the 5V bus power.
It means the part expects a regulated 5V rail, not a wide-input buck or a battery voltage. If your design has a 5V bus that droops under load, check that it stays above 4.5V at the TPS2514ADBVT supply pin — otherwise the internal charger-signature logic may not enumerate correctly. The 155µA supply current is the controller overhead; the load current to the portable device is switched through the internal power FET, rated per the datasheet's continuous current spec.