ACT4523A

    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 12 V
    • 250 kHz switching frequency
    • 91% efficiency (Vout = 5 V @ 3.5 A at Vin = 12 V)
    • Patented Active CC sensorless constant current control
    • Resistor programmable
    • +/- 6.5% CC accuracy
    • 2% feedback voltage accuracy
    • Advanced feature set

    Qorvo's ACT4523A 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. ACT4523A provides up to 3.5 A output current at 250 kHz switching frequency.

    Active CC is a patented control scheme to achieve highest accuracy with sensorless constant current control. Active CC eliminates the expensive, high accuracy current sense resistor, making it ideal for battery charging applications and adaptors with accurate current limit.

    The product achieves higher efficiency than traditional constant current switching regulators by eliminating its associated power loss on the sensing resistor. ACT4523A provides an OVP pin for output over-voltage protection. Other protection features include cycle-by-cycle current limit, thermal shutdown, and frequency foldback at short circuit.

    ACT4523A 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) 250
    ActiveCharge™ with Qualcomm QC 2.0 No
    AEC-Q100 No
    Cable Compensation Yes
    Sensorless CC Control Yes
    Package Type SOP-8EP
    RoHS Yes
    Lead Free Yes
    Halogen Free Yes
    ITAR Restricted No
    ECCN EAR99