Micrel Announces MIC5255 and MIC5256 LDO Regulators
Micrel Semiconductor (San Jose, CA) announced the first two devices in a new generation of micropower CMOS LDO regulators for battery-powered applications. The new MIC5255 and MIC5256 expand Micrel's line of 150mA micropower LDOs in IttyBitty SOT-23 packaging. They are suitable for use in cellular phones and pagers; battery-powered equipment; and laptop, notebook and palm computers.
The new regulators draw 90uA and zero current in their off mode. They offer 135mV at 150mA. Optimized for ultra-low-noise performance, the MIC5255 features a noise-bypass pin to reduce the output noise to 30uVrms. The MIC5256 provides an error flag to indicate detection of an over-current, thermal shutdown or dropout condition. Other features include a temperature range from -40 to 125 degrees C, a wide selection of fixed-output voltages and a ceramic output capacitor. Transient response is less than 10us.
"The MIC5255 and MIC5256 are the first two devices in Micrel's family of second-generation CMOS LDOs. Keeping the industry-leading dropout and noise performances of our first-generation LDOs, these new devices offer significant improvements in ac and dc performance," said Lisa Wong, LDO product marketing engineer at Micrel Semiconductor. "Among these improvements is power-supply rejection ratio (PSRR), the regulator's ability to maintain, clean and steady output for a given change in the supply. The new devices feature 60dB of PSRR, which means that for every 1mV change in supply, the output only changes by 1uV."
The MI5255 and MIC5256 are priced starting at $0.50 in quantities of 1,000. Samples are currently available, with production quantities available from stock to eight weeks ARO.
