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MIC4681 Datasheet(PDF) 1 Page - Micrel Semiconductor |
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MIC4681 Datasheet(HTML) 1 Page - Micrel Semiconductor |
1 / 16 page April 2005 1 MIC4681 MIC4681 Micrel MIC4681 2A-Peak SuperSwitcher™ SOP-8 Buck Regulator General Description The MIC4681 SuperSwitcher™ is an easy-to-use step-down (buck) voltage-mode switching regulator. The 200kHz MIC4681 achieves over 1A of continuous output current over a 4V to 30V input range in an 8-lead SOPpackage . The MIC4681 features a high 2.1A minimum current limit, making the device ideal for pulsed current applications such as GSM and TDMA cell phone battery chargers and power supplies. The MIC4681 sustains an output of 4.2V/2A within a typical GSM charging environment. The MIC4681 has an input voltage range of 4V to 30V, with excellent line, load, and transient response. The regulator performs cycle-by-cycle current limiting and thermal shut- down for protection under fault conditions. In shutdown mode, the regulator draws less than 6 µA of standby current. The MIC4681 SuperSwitcher™ regulator requires a mini- mum number of external components and can operate using a standard series of inductors and capacitors. Frequency compensation is provided internally for fast transient re- sponse and ease of use. The MIC4681 is available in the 8-lead SOP with a –40 °C to +125°C junction temperature range. Typical Applications SW L1 68 µH IN FB GND SHDN C2 220 µF 10V R1 3.01k R2 2.94k 2.5V/1A MIC4681BM C1 22 µF 35V +5V to +30V SHUTDOWN ENABLE Power SOP-8 5–8 4 3 2 1 D1 B340A or SS36 Adjustable Regulator Circuit Features • SO-8 package with over 1A continuous output current • Capable of 2A pulse charging for GSM applications • All surface mount solution • Only 4 external components required • Fixed 200kHz operation • Output adjustable down to 1.25V • Internally compensated with fast transient response • Wide 4V to 30V operating input voltage range • Less than 6 µA typical shutdown-mode current • Up to 90% efficiency • Thermal shutdown • Overcurrent protection Applications • Cellular phone battery charger • Cellular phone power supply • Simple 1A continuous high-efficiency step-down (buck) regulator • Replacement of a TO-220 and TO-263 designs • Positive-to-negative converter (inverting buck-boost) • Negative boost converter • Higher output current regulator using external FET Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com SuperSwitcher is a trademark of Micrel, Inc. |
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