40 V, 3.5 A CC/CV Step-Down DC/DC Converter with Dual Output and Separated Overcurrent Protection

    Key Features

    • 40 V input voltage surge
    • 4.5 to 36 V operational input voltage
    • Dual 5.1 V outputs with 1% accuracy
    • Up to 3.5 A output current
    • 2.65 A constant current regulation for VOUT1
    • 1.2 A constant current regulation for VOUT2
    • Hiccup mode protection at output short
    • > 90% efficiency at full load
    • < 0.5 mA low standby input current
    • 5.7 V output over-voltage protection
    • Cord voltage drop compensation
    • Meets EN55022 Class B radiated EMI standard

    Qorvo's ACT4524 is a wide input voltage, high efficiency step-down DC/DC converter that operates in either CV (Constant Output Voltage) mode or CC (Constant Output Current) mode.

    ACT4524 has separated output current limits for dual port Cigarette Lighter Adapter (CLA) applications. With the separated current limits, the CLA can meet Apple's MFI standard.

    The product provides up to 3.5 A output current at 125 kHz switching frequency. ACT4524 utilizes adaptive drive technique to achieve good EMI performance while maintain 90% efficiency at full load for mini-size CLA designs. ACT4524 also has built-in hiccup mode output short circuit protection. The average output current is reduced to below 6 mA when output is shorted to ground. Other features include output over-voltage protection and thermal shutdown.

    ACT4524 is available in a SOP-8EP package and requires very few external components for operation.

    Typical Applications

      • Car Chargers
      • Cigarette Lighter Adapters (CLAs)
      • Rechargeable Portable Devices
      • CV/CC Regulation DC/DC Converters
    Topology Step-Down
    Input Voltage(V) 4.5 to 36
    Max Output Current(A) 3.5
    Frequency(kHz) 125
    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