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Manufacturer Part #


MIC4576 Series 36 V 200 kHz 3 A Surface Mount Simple Buck Regulator - TO-263-5

ECAD Model:
Mfr. Name: Microchip
Standard Pkg:
Product Variant Information section
Date Code: 1135
Product Specification Section
Technical Attributes
Attributes Table
Topology: Buck
Input Voltage: 4V to 36V
Output Current-Max: 3A
Output Type: Adjustable
Switching Frequency-Max: 200kHz
Operating Temp Range: -40°C to +85°C
Duty Cycle-Max: 95%
Efficiency: 77%
No. of Outputs: 1
Quiescent Current: 10mA
Storage Temperature Range: -65°C to +150°C
Package Style:  TO-263-5 (D2PAK5)
Mounting Method: Through Hole
Features & Applications
The MIC4576WU is a 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 3.3 V, and 5 V fixed output versions or a 1.23 V to 33 V adjustable output version. Both versions are capable of driving a 3 A load with excellent line and load regulation.


  • Fixed 200 kHz operation
  • 3.3 V, 5 V, and adjustable output versions
  • Voltage over specified line and load conditions:
  • Fixed version: ±3% max. output voltage
  • Adjustable version: ±2% max. feedback voltage
  • Guaranteed 3 A switch current
  • Wide 4 V to 36 V input voltage range
  • Wide 1.23 V to 33 V 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 values
  • Thermal shutdown
  • Overcurrent protection
  • 100% electrical thermal limit burn-in


  • Simple high-efficiency step-down (buck) regulator
  • Efficient preregulator for linear regulators
  • On-card switching regulators
  • Positive-to-negative converter (inverting buck-boost)
  • Battery Charger
  • Negative boost converter
  • Step-down to 3.3 V for Intel Pentium™ and similar microprocessors
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Product Variant Information section