MICROCHIP MIC5249-1.8YMM

The MIC5249 is an efficient, precise 300mA CMOS voltage regulator with power on reset (POR) delay which can be implemented via an external capacitor. It offers 1% initial accuracy, extremely low dropout voltage (typically 400mV @ 300mA), and low ground current (typically 85mA) over load. Designed specifically for noise-critical applications in handheld or battery-powered devices, the MIC5249 comes equipped with a noise reduction feature to filter the output noise via an external capacitor. Other features of the MIC5249 include a logic-compatible enable pin, current limit, thermal shutdown, ultra-fast transient response, and an active clamp to speed up device turnoff. The MIC5249 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in hand-held wireless devices.

• 300mA output current
• High PSRR: 65dB@120Hz
• Stable with ceramic output capacitor
• Power-on-Reset (POR) output with adjustable delay time
• High output accuracy: ±1.0% initial accuracy ±3.0% over temperature
• Low dropout voltage of 340mV @ 300mA
• Low quiescent current: 85μA
• Zero current shutdown mode
• Thermal-shutdown and current-limit protection
• Tiny MSOP-8 package

• Cellular phones
• PDAs
• Fiber optic modules