MICROCHIP MIC5259-3.3YD5-TR

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. Designed specifically for handheld and battery-powered devices, the MIC5259 provides a TTL-logic-compatible enable pin. When disabled, power consumption drops to nearly zero. The MIC5259 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications; critical issue in handheld wireless devices. Key features include current limit, thermal shutdown, faster transient response, and an active clamp to speed up device turn-off. The MIC5259 is available in the 6-pin 2mm × 2mm MLF package and the 5-pin Thin SOT-23 package in a wide range of output voltages.

• 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

• Cellular phones and pagers
• Cellular accessories
• Battery-powered equipment
• Laptop, notebook, and palmtop computers
• Consumer/personal electronics
• Industrial portable electronics
• PC peripherals