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General Description

The MIC5259 is an efficient CMOS voltage regulator optimized for low-noise applications. It offers 1.5 initial accuracy, low dropout voltage (300mV at 300mA) and low ground current (typically 105μA at light load). The MIC5259 provides a very-low-noise output, ideal for RF applications where a clean voltage source is required. The MIC5259 has a high PSRR even at low supply voltages, critical for battery operated electronics. A noise bypass pin is also available for further reduction of output noise.

Features

? Input voltage range: 2.7V to 6.0V

? PSRR = 70dB @ 1kHz

? Low output noise: 30μV(rms)

? Stability with ceramic output capacitors

? Low-dropout: 300mV @ 300mA

? High-output accuracy:

– 1.5 initial accuracy

– 3.0 over temperature

? Low quiescent current: 105μA

? Tight load and line regulation

? TTL-Logic-controlled enable input

? “Zero” off-mode current

? Thermal shutdown and current limit protection

Applications

? Cellular phones and pagers

? Cellular accessories

? Battery-powered equipment

? Laptop, notebook, and palmtop computers

? Consumer/personal electronics

? Industrial portable electronics

? PC peripherals