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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
  • 250kHz Switching Frequency
  • 91% Efficiency (Vout = 5V@3.5A at Vin = 12V)
  • Patented ActiveCC Sensorless Constant Current Control
    • Integrated Current Control Improves Efficiency, Lowers Cost, and Reduces Component Count
  • Resistor Programmable
    • Current Limit from 1.5A to 4A
    • Patented Cable Compensation from 0Ω to 0.25Ω
  • ±6.5% 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


ACT4523A 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. ACT4523A provides up to 3.5A output current at 250kHz switching frequency. Active CC is a patented control scheme to achieve highest accuracy with sensorless constant current control. ActiveCC eliminates the expensive, high accuracy current sense resistor, making it ideal for battery charging applications and adaptors with accurate current limit. The ACT4523A achieves higher efficiency than traditional constant current switching regulators by eliminating its associated power loss on the sensing resistor. ACT4523A provides OVP pin for output over voltage protection. Protection features include cycle-by-cycle current limit, thermal shutdown, and frequency foldback at short circuit.

The ACT4523A is available in a SOP-8EP package and require very few external components for operation.













ACT4523A Datasheet