View ncp551 ncv551 datasheet:

NCP551, NCV551 150 mA CMOS Low Iq Low-Dropout Voltage Regulator The NCP551 series of fixed output low dropout linear regulators are designed for handheld communication equipment and portable battery http://onsemi.com powered applications which require low quiescent. The NCP551 series features an ultra-low quiescent current of 4.0 mA. Each device 5 contains a voltage reference unit, an error amplifier, a PMOS power transistor, resistors for setting output voltage, current limit, and temperature limit protection circuits. 1 The NCP551 has been designed to be used with low cost ceramic TSOP-5 capacitors and requires a minimum output capacitor of 0.1 mF. The (SOT23-5, SC59-5) SN SUFFIX device is housed in the micro-miniature TSOP-5 surface mount CASE 483 package. Standar