Use the LDO LP2996MR linear regulator from Texas Instruments to maintain a constant output voltage. This voltage regulation device"s single output can produce a current up to 1.5 A. With a small input voltage of 2.2 V and a max of 5.5 V, this will supply sufficient power to your circuit. With a fixed output that has a voltage of 1.159|1.259|1.359 V, this is power management at its best. In order to ensure parts aren"t damaged by bulk packaging, this product comes in tube packaging to add a little more protection by storing the loose parts in an outer tube. This voltage regulation device has a minimum operating temperature of 0 °C and a maximum of 125 °C. Its polarity is positive.