ACT4533C

    40 V, 3.5 A Sensorless CC/CV Step-Down DC/DC Converter

    Key Features

    • 40 V input voltage surge
    • 36 V steady state operation
    • Up to 3.5 A output current
    • Output voltage up to 18 V
    • 125 kHz switching frequency eases EMI design
    • 91% efficiency (Vout = 5V @ 2.4 A at Vin = 12 V)
    • Stable with low ESR ceramic capacitors to allow low-profile designs
    • Integrated over-voltage protection
    • Excellent EMI performance
    • Patented Active CC sensorless constant current control improves efficiency and lowers cost
    • Resistor programmable
    • 2% feedback voltage accuracy
    • Advanced feature set

    Qorvo's ACT4533C 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. ACT4533C provides up to 3.5 A output current at 125 kHz switching frequency.

    Active CC is a patented control scheme to achieve high-accuracy sensorless constant current control. Active CC eliminates the expensive, high accuracy current sense resistor, making it ideal for Cigarette Lighter Adapter (CLA) applications.

    ACT4533C integrates adaptive gate drive to achieve excellent EMI performance, passing the EN55022 Class B EMC standard without adding additional EMI components while maintaining high conversion efficiency.

    Protection features include cycle-by-cycle current limit, thermal shutdown and frequency foldback at short circuit.

    ACT4533C is available in a SOP-8EP package and requires very few external components for operation.

    Typical Applications

      • Car Chargers / Adapters
      • Rechargeable Portable Devices
      • General Purpose CC/CV Power Supplies
    Topology Step-Down
    Input Voltage(V) 10 to 40
    Max Output Current(A) 3.5
    Frequency(kHz) 125
    ActiveCharge™ with Qualcomm QC 2.0 Yes
    AEC-Q100 No
    Cable Compensation Yes
    Sensorless CC Control No
    Package Type SOP-8EP
    RoHS Yes
    Lead Free Yes
    Halogen Free Yes
    ITAR Restricted No
    ECCN EAR99