Active-Semi Solutions for Sustainability
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?Product Features

  • 40V Input Voltage Surge
  • 36V Steady State Operation
  • Up to 3.5A output current
  • Output Voltage up to 12V
  • 125kHz Switching Frequency Eases EMI Design
  • 91% Efficiency (Vout=5V@2.4A at Vin=12V)
  • Stable with Low-ESR Ceramic Capacitors to Allow Low-Profile Designs
  • Patent ActiveCC Sensorless Constant Current
    Control Improves Efficiency and Lowers Cost
  • Integrated Over Voltage Protection
  • Excellent EMI Performance
  • ±7.5% CC Accuracy
    • Compensation of Input /Output Voltage Change
    • Temperature Compensation
    • Independent of inductance and Inductor DCR
  • 2% Feedback Voltage Accuracy
  • Advanced Feature Set
    • Integrated Soft Start
    • Thermal Shutdown
    • Secondary Cycle-by-Cycle Current Limit
    • Protection Against Shorted ISET Pin
  • SOP-8EP Package


ACT4533A/B is a wide input voltage, high efficiency?ActiveCC step-down DC/DC converter that operates in either CV (Constant Output Voltage) mode or CC (Constant Output Current) mode. ACT4533A/B?provides up to 3.5A output current at 125kHz switching frequency. ActiveCC is a patented control scheme to achieve high-accuracy sensorless constant current control. ActiveCC eliminates the expensive, high accuracy current sense resistor, making it ideal for CLA applications.
ACT4533A/B integrates adaptive gate drive to achieve excellent EMI performance passing EN55022 Class B EMC standard without adding additional EMI components while maintaining high conversion efficiency.
五分快三计划 Protection features include cycle-by-cycle current limit, thermal shutdown, and frequency foldback at short circuit.


The only difference between ACT4533A and ACT4533B is that Pin 7 provides OVP for ACT4533A and EN/OVP for ACT4533B.

The ACT4533A/B are available in a SOP-8EP package and require very few external components for operation.











ACT4533A/B Datasheet


Application Note

ACT4533A Application Note
5V/3.1A Car Charger Solution using ACT4533A

ACT4533B Application Note
五分快三计划 5V/3.1A Car Charger Solution using ACT4533B