The MIC5247 is an efficient and precise, low-voltage CMOS voltage regulator optimized for ultra-low noise applications. The MIC5247 offers better than 1% initial accuracy and 85μA constant ground current over load (typically 85μA). The MIC5247 provides a very low-noise output, ideal for RF applications where quiet voltage sources are required. A noise bypass pin is also available for further reduction of output noise. Designed specifically for handheld and battery-powered de- vices, the MIC5247 provides a logic compatible enable pin. When disabled, power consumption drops nearly to zero. The MIC5247 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in handheld wireless devices. Key features include current limit, thermal shutdown, a push- pull output for faster transient response, and an active clamp to speed up device turnoff. Available in the 6-pin 2mm × 2mm MLF™ package and the IttyBitty® SOT-23-5 package, the MIC5247 also offers a range of fixed output voltages. All support documentation can be found on Micrel’s web site at www.micrel.com.