MIC4576-5BU IC-Step Down Regulator IC
The MIC4576 is a series of easy to use fixed and adjustable BiCMOS step-down (buck) switch-mode voltage regulators. The 200kHz MIC4576 duplicates the pinout and function of the 52kHz LM2576. The higher switching frequency may allow up to a 2:1 reduction in output filter inductor size. The MIC4576 is available in 3.3V, and 5V fixed output versions or a 1.23V to 33V adjustable output version. Both versions are capable of driving a 3A load with excellent line and load regulation.
Features/Specs:
 • Fixed 200kHz operation
 • 3.3V, 5V, and adjustable output versions
 • Voltage over specified line and load conditions: Fixed version: ±3% max. output voltage Adjustable version: ±2% max. feedback voltage
 • Guaranteed 3A switch current
 • Wide 4V to 36V input voltage range
 • Wide 1.23V to 33V output voltage range
 • Requires minimum external components
 • < 200µA typical shutdown mode
 • 75% efficiency (adjustable version > 75% typical)
 • Standard inductors are 25% of typical LM2576 values
 • Thermal shutdown
 • Overcurrent protection
 • 100% electrical thermal limit burn-in
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