This is a Linear Voltage Regulator (LDO) made by the company Broadchip and housed in a SOT-23-3 package. It is the model BCT2036EUR33-TR, a low-dropout (LDO) regulator with high performance and fast transient response. It supports a wide input voltage range (from 2.5V to 5.5V) and outputs currents up to 200 mA. It is also RoHS compliant and uses low ESR capacitors for power supply ripple rejection. The wide range of features make it suitable for a variety of applications, including mobile phones, communications, consumer electronics, automotive electronics and low noise power supplies.