Use the LDO LDK120M33R linear regulator from STMicroelectronics to maintain a constant output voltage. Its typical dropout voltage at current is 0.1@100mA|0.15@200mA V. It has an overall accuracy of ±2 %. This voltage regulation device"s single output can produce a current up to 0.2 A. Use this part at voltages between 1.9 V and 5.5 V. With a fixed output that has a voltage of 3.3 V, this is power management at its best. To produce a constant current at your output, supply your circuit with a load regulation of 0.006%/mA(Typ) and line regulation of 0.05%/V(Typ). This product will be shipped in tape and reel packaging so that components can be mounted effectively. The maximum dropout voltage is 0.3@200mA V. This voltage regulation device has a minimum operating temperature of -40 °C and a maximum of 125 °C. Its polarity is positive.