MIC5209 500mA Low-Noise LDO Voltage Regulator - Micrel - #1

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June 2006 1 M9999-060906 Typical Applications 1 2 3 0.1ìF 22ìF tantalum VOUT 2.5V ±1% VIN 3.0V MIC5209-2.5BS 3.3V Nominal-Input Slot-1 Power Supply 1 2 3 4 8 7 6 5 MIC5209-5.0BM 2.2ìF tantalum VOUT 5V 470pF (OPTIONAL) VIN 6V ENABLE SHUTDOWN Ultra-Low-Noise 5V Regulator MIC5209 500mA Low-Noise LDO Regulator General Description The MIC5209 is an effi cient linear voltage regulator with very low dropout voltage, typically 10mV at light loads and less than 500mV at full load, with better than 1% output voltage accuracy. Designed especially for hand-held, battery-powered devices, the MIC5209 features low ground current to help prolong battery life. An enable/shutdown pin on SO-8 and TO-263- 5 versions can further improve battery life with near-zero shutdown current. Key features include reversed-battery protection, current limiting, overtemperature shutdown, ultra-low-noise capability (SO-8 and TO-263-5 versions), and availability in thermally effi cient packaging. The MIC5209 is available in adjustable or fi xed output voltages. For space-critical applications where peak currents do not exceed 500mA, see the MIC5219. Features • Meets Intel® Slot 1 and Slot 2 requirements • Guaranteed 500mA output over the full operating temperature range • Low 500mV maximum dropout voltage at full load • Extremely tight load and line regulation • Thermally-effi cient surface-mount package • Low temperature coeffi cient • Current and thermal limiting • Reversed-battery protection • No-load stability • 1% output accuracy • Ultra-low-noise capability in SO-8 and TO-263-5 • Ultra-small 3mm x 3mm MLF™ package Applications • Pentium II Slot 1 and Slot 2 support circuits • Laptop, notebook, and palmtop computers • Cellular telephones • Consumer and personal electronics • SMPS post-regulator/dc-to-dc modules • High-effi ciency linear power supplies Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com