Micrel Announces the MIC5255 and MIC5256 CMOS LDO Regulators
Micrel Semiconductor Inc. (San Jose, CA) announced the first two devices in a new generation of micropower CMOS low-dropout (LDO) regulators for battery-powered applications. The 150mA micropower MIC5255 and MIC5256 are now available; are packaged in IttyBitty SOT-23 packaging; and are suitable for use in cellular phones, battery-powered equipment and notebook computers.
The MIC5255 and MIC5256 draw 90uA and zero current in the off-mode. Their dropout voltage is 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 a dropout condition. Both the MIC5255 and MIC5256 operate within a temperature range of -40 to 125 degrees C.
"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. "Among these improvements is power supply rejection ratio (PSRR). The new devices feature 60dB of PSRR, which means that for every 1mV change in supply, the output only changes by 1uV."
The MIC5255 and MIC5256 conform to the industry-standard pinout for SOT-23-packaged LDOs. They are pin-to-pin functional upgrades of Micrel's MIC5245 and MIC5246. Both are uCap designs. When purchased in quantities of 1,000 pieces, pricing for the MIC5255 and MIC5256 starts at $0.50. Samples are currently available, with production quantities in stock to eight weeks ARO.
