Micrel, Inc. MIC4680 Ordering Information Part Number Standard Pb-Free Voltage Junction Temp. Range Package MIC4680BM MIC4680YM Adj. –40°C to +125°C 8-Pin SOIC MIC4680-3.3BM MIC4680-3.3YM 3.3V –40°C to +125°C 8-Pin SOIC MIC4680-5.0BM MIC4680-5.0YM 5.0V –40°C to +125°C 8-Pin SOIC Pin Configuration SHDN 1 8 GND IN 2 7 GND SW 3 6 GND FB 4 5 GND 8-Pin SIOC (M) Pin Description Pin Number Pin Name 1 SHDN 2 VIN Supply Voltage (Input): Unregulated +4V to +34V supply voltage. 3 SW Switch (Output): Emitter of NPN output switch. Connect to external storage inductor and Shottky diode. 4 FB Feedback (Input): Connect to output on fixed output voltage versions, or to 1.23V-tap of voltage-divider network for adjustable version. 5–8 GND March 2008 Pin Function Shutdown (Input): Logic low enables regulator. Logic high (>1.6V) shuts down regulator. Ground 2 M9999-032808
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