What is RSR 09TI chip? There is a chip on Arduino UNO board which I can not find anything about. It is labeled RSR 09TI. It is placed near other power related components (see the image), but what is its purpose on the board?
I believe that is the dual op-amp that is used for both monitoring VIN to enable/disable the USB power, and as a buffer for the LED on pin 13.

In the schematic it's U1, and is an LM358.