MIC5219 500mA-Peak Output LDO Regulator - Micrel - #1

Text version of the page

June 2009 1 M0371-061809 Micrel, Inc. MIC5219 Typical Applications MIC5219 500mA-Peak Output LDO Regulator General Description The MIC5219 is an efficient linear voltage regulator with high peak output current capability, very-low-dropout voltage, and better than 1% output voltage accuracy. Dropout is typically 10mV at light loads and less than 500mV at full load. The MIC5219 is designed to provide a peak output current for start-up conditions where higher inrush current is demanded. It features a 500mA peak output rating. Continuous output current is limited only by package and layout. The MIC5219 can be enabled or shut down by a CMOS or TTL compatible signal. When disabled, power consumption drops nearly to zero. Dropout ground current is minimized to help prolong battery life. Other key features include reversedbattery protection, current limiting, overtemperature shutdown, and low noise performance with an ultra-low-noise option. The MIC5219 is available in adjustable or fixed output voltages in the space-saving 6-pin (2mm × 2mm) MLF®, 6-pin (2mm × 2mm) Thin MLF® SOT235 and MM8® 8pin power MSOP packages. For higher power requirements see the MIC5209 or MIC5237. All support documentation can be found on Micrel’s web site at www.micrel.com. Features • 500mA output current capability SOT-23-5 package - 500mA peak 2mm×2mm MLF® package - 500mA continuous 2mm×2mm Thin MLF® package - 500mA continuous MSOP-8 package - 500mA continuous • Low 500mV maximum dropout voltage at full load • Extremely tight load and line regulation • Tiny SOT-23-5 and MM8™ power MSOP-8 package • Ultra-low-noise output • Low temperature coefficient • Current and thermal limiting • Reversed-battery protection • CMOS/TTL-compatible enable/shutdown control • Near-zero shutdown current Applications • Laptop, notebook, and palmtop computers • Cellular telephones and battery-powered equipment • Consumer and personal electronics • PC Card VCC and VPP regulation and switching • SMPS post-regulator/DC-to-DC modules • High-efficiency linear power supplies 1 2 3 4 8 7 6 5 MIC5219-5.0BMM 2.2ìF tantalum VOUT5V VIN6V E NA B LE SHUTDOWN 470pF 5V Ultra-Low-Noise Regulator 1 5 2 3 4 2.2ìF tantalum 470pF VOUT3.3V MIC5219-3.3BM5 VIN4V E NA B LE SHUTDOWN 3.3V Ultra-Low-Noise Regulator Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com MM8 is a registered trademark of Micrel, Inc. MicroLeadFrame and MLF are registered trademarks of Amkor Technology, Inc.. ENABLE SHUTDOWN MIC5219-x.xYML EN 1 6 CBYP (optional) VIN VOUT COUT 5 4 2 3 Ultra-Low-Noise Regulator (Fixed) ENABLE SHUTDOWN MIC5219YMT EN 1 6 470pF VIN VOUT 2.2ìF 5 4 2 3 R1 R2 + Ultra-Low-Noise Regulator (Adjustable)