MIC4680 1A 200kHz SuperSwitcher™ Buck Regulator General Description Features The MIC4680 SuperSwitcher™ is an easy-to-use fixed or adjustable output voltage step-down (buck) switch-mode voltage regulator. The 200kHz MIC4680 achieves up to 1.3A of continuous output current over a wide input range in a 8-pin SOIC. The MIC4680 is available in 3.3V and 5V fixed output versions or adjustable output down to 1.25V. The MIC4680 has an input voltage range of 4V to 34V, with excellent line, load, and transient response. The regulator performs cycle-by-cycle current limiting and thermal shutdown for protection under fault conditions. In shutdown mode, the regulator draws less than 2µA of standby current. The MIC4680 SuperSwitcher™ regulator requires a minimum number of external components and can operate using a standard series of inductors and capacitors. Frequency compensation is provided internally for fast transient response and ease of use. The MIC4680 is available in the 8-pin SOIC with a –40°C to +125°C junction temperature range. • • • • • • • • • • • SOIC-8 package with up to 1.3A output current All surface mount solution Only 4 external components required Fixed 200kHz operation 3.3V, 5V, and adjustable output versions Internally compensated with fast transient response Wide 4V to 34V operating input voltage range Less than 2µA typical shutdown-mode current Up to 90% efficiency Thermal shutdown Overcurrent protection Applications • • • • • • • • Simple 1A high-efficiency step-down (buck) regulator Replacement of TO-220 and TO-263 designs Efficient pre-regulator (5V to 2.5V, 12V to 3.3V, etc.) On-card switching regulators Positive-to-negative converter (inverting buck-boost) Simple battery charger Negative boost converter Higher output current regulator using external FET Typical Application +6V to +34V C1 15µF 35V SHUTDOWN ENABLE Power SOIC-8 MIC4680-3.3BM 2 1 IN SHDN SW 3 FB 4 L1 68µH GND 5–8 D1 B260A or SS26 Fixed Regulator Circuit 3.3V/1A C2 220µF 16V +5V to +34V C1 15µF 35V SHUTDOWN ENABLE Power SOIC-8 2 1 MIC4680BM IN SW SHDN FB GND 5–8 3 L1 2.5V/1A 68µH R1 3.01k 4 D1 B260A or SS26 R2 2.94k C2 220µF 16V Adjustable Regulator Circuit SuperSwitcher is a trademark of Micrel, Inc. Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com March 2008 M9999-032808
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