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MIC4576-5BU IC – Step Down Regulator IC

199.00 Excluding tax

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The MIC4576 is a series of easy-to-use fixed and adjustable BiCMOS step-down (buck) switch-mode voltage regulators. The 200 kHz MIC4576 duplicates the pinout and function of the 52 kHz 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. The feedback voltage is guaranteed to ±2% tolerance for adjustable versions, and the output voltage is guaranteed to ±3% for fixed versions, within specified voltages and load conditions. The oscillator frequency is guaranteed to ±10%. In Shutdown mode, the regulator draws less than 200 µA shutdown current. The regulator performs cycle-by-cycle current limiting and thermal shutdown for protection under fault conditions. This series of simple switch-mode regulators requires a minimum number of external components and can operate using a standard series of inductors. Frequency compensation is provided internally. The MIC4576 is available in TO-220 (T) and TO-263 (U) packages for the industrial temperature range.


  • Fixed 200 kHz Operation
  • 3.3V, 5V, and Adjustable Output Versions
  • Voltage Over Specified Line and Load Conditions: – Fixed version: ±3% maximum output voltage – Adjustable version: ±2% maximum 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
  • <200 µA Typical Shutdown Mode
  • 75% Efficiency (Adjustable Version > 75% Typical)
  • Standard Inductors are 25% of Typical LM2576 Inductor Values
  • Thermal Shutdown
  • Over current Protection
  • 100% Electrical Thermal Limit Burn-In


Parameter Specification
Supply Voltage (VIN) 40V
Shutdown Voltage (VSHDN)  –0.3V to +36V
Output Switch (VSW), Steady State –1V
Feedback Voltage (VFB) [Adjustable] 3.8V
Storage Temperature (TS) –65°C to +150°C
Junction Temperature (TJ) 150°C

MIC4576 Datasheet

* product image for illustration purposes only. actual product may vary.


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