Use this LDO LT3024EDE linear regulator from Linear Technology to vary your voltage levels to your desired level. Its typical dropout voltage at current is 0.13@10mA|0.17@50mA|0.2@100mA|0.3@500mA|0.1@1mA|0.17@10mA|0.24@50mA|0.3@100mA V. This voltage regulation device"s 2 outputs can produce a current up to 0.1|0.5 A. Using the part will provide the power your application needs by requiring a voltage only of 1.8 V and not exceeding a voltage of 20 V. With an adjustable output that has a voltage of 1.22 to 20 V, this is power management at its best. At a load regulation of 12mV and line regulation of 10mV your circuit is capable of maintaining a constant voltage level at your output. The maximum dropout voltage is 0.19@10mA|0.22@50mA|0.34@100mA|0.35@500mA|0.15@1mA|0.22@10mA|0.31@50mA|0.35@100mA V. Its polarity is positive. This voltage regulation device has a minimum operating temperature of -40 °C and a maximum of 125 °C.