The ADP3309 is a member of the ADP330x family of precision low dropout anyCAP voltage regulators. It is pin-for-pin and functionally compatible with National's LP2981, but offers performance advantages. The ADP3309 stands out from conventional LDOs with a novel architecture and an enhanced process. Its patented design requires only a 0.47 F output capacitor for stability. This device is stable with any type of capacitor regardless of its ESR (Equivalent Series Resistance) value, including ceramic types for space restricted applications. The ADP3309 achieves 1.2% accuracy at room temperature and 2.2% overall accuracy over temperature, line and load regulations. The dropout voltage of the ADP3309 is only