GENERAL DESCRIPTION
ACT4533 is a wide input voltage, high efficiency Active CC step-down DC/DC converter that operates in either CV (Constant Output Voltage) mode or CC (Constant Output Current) mode. ACT4533 provides up to 3A output current at 125kHz switching frequency.

FEATURES
• 40V Input Voltage Surge
• 32V Steady State Operation
• Up to 3A Output Current
• Constant Current Output with Input up to 32V
• Output Voltage up to 12V
• 125kHz Switching Frequency Eases EMI Design
• Good EMI Performance to Pass EN55022
   Radiation Regulation without adding EMI
   Components
• Patent Pending Active CC Sensorless Constant
   Current Control
   − Integrated Current Control Improves
      Efficiency, Lowers Cost, and Reduces
      Component Count
• Resistor Programmable
   − Current Limit from 1.5A to 3A
   − Patented Cable Compensation from 0 to 0.3Ω
• ±7.5% CC Accuracy
   − Compensation of Input /Output Voltage Change
   − Temperature Compensation
   − Independent of inductance and Inductor DCR
• 2% Feedback Voltage Accuracy
• Up to 92% Efficiency
• Advanced Feature Set
   − Integrated Soft Start
   − Thermal Shutdown
   − Secondary Cycle-by-Cycle Current Limit
   − Protection Against Shorted ISET Pin
• SOP-8EP Package

APPLICATIONS
• Car Charger/ Adaptor
• Rechargeable Portable Devices
• General-Purpose CC/CV Supply