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