Datasheet

Micrel, Inc. MIC4680
March 2008 2
M9999-032808
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
1SHDN
IN
SW
FB
8 GND
GND
GND
GND
7
6
5
2
3
4
8-Pin SIOC (M)
Pin Description
Pin Number Pin Name Pin Function
1 SHDN
Shutdown (Input): Logic low enables regulator. Logic high (>1.6V) shuts down
regulator.
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 Ground