ACT4533A

    40 V, 3.0 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
    • 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
    • Patent Active CC sensorless constant current control improves efficiency and lowers cost
    • Integrated over-voltage protection
    • Excellent EMI performance
    • +/- 7.5% CC accuracy
    • 2% feedback voltage accuracy
    • Advanced feature set

    Qorvo's ACT4533A 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. ACT4533A 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.

    ACT4533A 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.

    The only difference between ACT4533A and ACT4533B is that Pin 7 provides OVP for ACT4533A and EN/OVP for ACT4533B.

    ACT4533A is available in a SOP-8EP package and require 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 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

    EA4533AYHEA4533AYH Evaluation Kit

    EA4533AYH Evaluation Tool User's Guide

    This is a complete, stand-alone, dual output USB car charger solution. It is built with an automotive car charger form factor to show performance in a real form factor application. The EVK contains the high efficiency ACT4533A step-down DC/DC converter that operates in either CV (Constant Output Voltage) mode or CC (Constant Output Voltage) mode.

    The EVK provides two USB Type A output connectors. It provides up to 3.1A output current at 125kHz switching frequency. It operates from Vin=12V to 32V and provides a 5.1V output voltage.