The NCP502 series of fixed output low quiescent current low dropout (LDO) linear voltage regulators are designed for handheld communication equipment and portable battery powered applications which require low quiescent. The NCP502 series features an ultra-low quiescent current of 40 µA. Each device contains a voltage reference unit, an error amplifier, a PMOS power transistor, resistors for setting output voltage, current limit, and temperature limit protection circuits. The NCP502 has been designed to be used with low cost ceramic capacitors. The LDO linear voltage regulator is housed in the micro-miniature SC70-5 surface mount package. Standard voltage versions are 1.5, 1.8, 2.5, 2.7, 2.8, 2.9, 3.0, 3.1, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8 and 5.0 V. Other voltages are available in 100 mV steps.