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MIC4690YM Datasheet(PDF) 1 Page - Micrel Semiconductor |
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MIC4690YM Datasheet(HTML) 1 Page - Micrel Semiconductor |
1 / 12 page April 2005 1 MIC4690 MIC4690 Micrel MIC4690 500kHz 1A SuperSwitcher™ Buck Regulator General Description The MIC4690 SuperSwitcher™ is an easy-to-use, 500kHz step-down PWM voltage regulator. The MIC4690 achieves over 1A of continuous output current over a wide input voltage range in an 8-lead SO (small outline) package. The high switching frequency of the MIC4690 allows the smallest surface-mount inductors and capacitors to be used. Internal compensation ensures fast transient response and a minimum amount of external components. The MIC4690 features a power SO-8 package with a special lead frame that allows over 1A of continuous current. The MIC4690, housed in an SO-8, can replace larger TO-220 and TO-263 packages in many applications. The MIC4690 allows for a high degree of safety. It has a wide input voltage range of 4V to 34V, allowing for it to be used in applications where input voltage transients may be present. Built-in safety features include over-current protection, fre- quency foldback protection, and thermal shutdown. The MIC4690 is available in an 8-lead SO package with a junction temperature range of –40°C to +125°C. Typical Application SW L1 10µH VIN FB GND SHDN C2 100µF 4V R1 3.01k R2 2.94k 2.5V/1A MIC4690BM C1 22µF 10V 5V SHUTDOWN ENABLE Power SOP-8 5Ð8 4 3 2 1 D1 2A 20V 2.5V Adjustable Converter SW L1 18µH VIN FB GND SHDN C2 220µF 4V R1 3.01k R2 6.49k 1.8V/1A MIC4690BM C1 22µF 10V 4V to 30V (34V Transient) SHUTDOWN ENABLE Power SOP-8 5Ð8 4 3 2 1 D1 2A 20V 1.8V Adjustable Converter Features • SO-8 package with over 1A output current • Fixed 500kHz operation • Wide 4V to 34Vinput voltage range • Output voltage adjustable to 1.23V • All surface mount solution • Internally compensated with fast transient response • Up to 85% efficiency • Overcurrent protection • Frequency foldback short-circuit protection • Thermal shutdown Applications • Simple 1A step-down (buck) regulator • Replacement of TO-220 and TO-263 designs • 12V to 5V/3.3V/2.5V/1.8V/1.5V conversion • 5V to 2.5V/1.8V/1.5V conversion • On-card switching regulators • Hard disk drives • Cable modems • Positive-to-negative converters • Simple battery chargers Micrel, Inc. • 2180 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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