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.

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