MIC5249 300mA Cap LDO with Programmable Power-On Reset Delay General Description Features The MIC5249 is an efficient, precise 300mA CMOS 300mA output current voltage regulator with power on reset (POR) delay which High PSRR: 65dB 120Hz can be implemented via an external capacitor. It offers 1% Stable with ceramic output capacitor initial accuracy, extremely low dropout voltage (typically Power-on-Reset (POR) output with adjustable delay 400mV 300mA), and low ground current (typically time 85mA) over load. High output accuracy: Designed specifically for noise-critical applications in hand- held or battery-powered devices, the MIC5249 comes 1.0% initial accuracy equipped with a noise reduction feature to filter the output 3.0% over temperature noise via an external capacitor. Other features of the Low dropout voltage of 340mV 300mA MIC5249 include a logic-compatible enable pin, current Low quiescent current: 85A limit, thermal shutdown, ultra-fast transient response, and Zero current shutdown mode an active clamp to speed up device turnoff. Thermal-shutdown and current-limit protection The MIC5249 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary Tiny MSOP-8 package for power applications, critical in hand-held wireless devices. Applications The MIC5249 is available in the MSOP-8 package. Cellular phones Data sheets and support documentation can be found on PDAs Micrels web site at: www.micrel.com. Fiber optic modules Typical Application Ultra-Low Noise Application Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MIC5249 Ordering Information (1) Part Number Voltage Junction Temperature Range Package MIC5249-1.5YMM 1.5V 40C to +125C 8-Pin MSOP MIC5249-1.8YMM 1.8V 40C to +125C 8-Pin MSOP MIC5249-2.5YMM 2.5V 40C to +125C 8-Pin MSOP MIC5249-2.6YMM 2.6V 40C to +125C 8-Pin MSOP MIC5249-2.8YMM 2.8V 40C to +125C 8-Pin MSOP MIC5249-2.85YMM 2.85V 40C to +125C 8-Pin MSOP MIC5249-3.0YMM 3.0V 40C to +125C 8-Pin MSOP MIC5249-3.3YMM 3.3V 40C to +125C 8-Pin MSOP Note: 1. Other voltages available. Contact Micrel Marketing for details. Pin Configuration CBYP 1 8 ENABLE DELAY 2 7 RESET GND 3 6 NC VIN 4 5 VOUT 8-pin MSOP (MM) Pin Description Pin Number Pin Name Pin Function Reference Bypass. Connect external 0.01F capacitor to GND to reduce output noise. May be left 1 CBYP open. 2 DELAY Delay Set Input. Connect external capacitor to GND to set the delay of the Error Flag. 3 GND Ground. 4 VIN Supply Input. 5 VOUT Regulator Output. 6 NC No Connect. 7 RESET RESET Output. Open-drain output. Active low indicates an output undervoltage condition. Enable Input: CMOS-compatible input. Logic high = enable Logic low = shutdown. Do not leave 8 ENABLE open. M9999-030812 March 2012 2