XC6210 is a LDO Voltage regulator from Torex Semiconductor. It is available for various preset voltages starting from 0.80V to 5.00V at 0.05v increments. It is capable of delivering 700mA. The 3.3v version has typical drop of 70mV at 100mA. Here is the datasheet attached.

The chip is a bit delicate, I damaged two chips while soldering back after desoldering. And strangely in both cases the same pin broke.

The attached eagle library is for the SOT-89-5 package – XC6210 SOT-89-5 Eagle Library