40 V, 4.0 A CC/CV Step-Down DC/DC Converter with USB PD 3.0 PPS

    Key Features

    • USB certified charger design available
    • Supports small ceramic output capacitors
    • 50 mOhm integrated high-/low-side FETs
    • Input voltage range: 4.5 to 40 V
    • Integrated mini-buck bias supply: 5 V at 350 mA
    • I2C Programmable output voltage: 3 to 24 V in 12.5 mV steps
    • I2C Programmable output current limit: 0 to 4 A with 256 step resolution
    • Fixed-frequency current-mode control: 450 kHz to 2.25 MHz
    • External clock synchronization and 100% duty cycle operation
    • Out of AM radio / spread-spectrum operation
    • Auxiliary LDO: 0.9 to 4.0 V at  20 mA
    • I2C interface, fast-mode plus (Fm+, 1 MHz) with configurable address

    Qorvo's ACT4752 is a programmable DC-to-DC buck converter with bias supply rails for microcontrollers or USB PD controllers. It supports a wide input voltage range from 4.5 to 40 V and uses a synchronous step-down (buck) voltage regulator architecture. It integrates both the high side and low side MOSFETS. These 50 mOhm RDSON transistors enable high efficiency to reduce power losses.

    ACT4752 supports smaller MLCC (multi-layer ceramic capacitor) devices.

    The product's main buck converter can be dynamically programed to an output voltage between 3 and 24 V in 12.5 mV steps via the I2C interface or analog feedback. It also can dynamically program output current between 0 and 4 A in 256 steps via the I2C interface in a constant-current (CC) operation mode. The main buck operates in a proprietary current mode control that supports external clock syncing for switching frequencies between 450 kHz and 2.25 MHz.

    ACT4752 is a perfect solution for USB Power Delivery (PD) 3.0 and Programmable Power Supply (PPS) applications. The product integrates a 5 V / 350 mA mini-buck converter and a 20 mA AUX LDO to simplify application system designs. These rails can power up a controller and the 1.5 W VCONN line in active USB-C cables.

    ACT4752 is available in a 32-pin 5mm x 5mm QFN package with a power optimized footprint and exposed pad for improved thermal performance.

    Typical Applications

      • USB PD 3.0 Charging Hubs
      • Power Management for USB-C Power Rails
      • Industrial SMPS for 24V Bus
      • High Power LED Lighting
    Topology Step-Down
    Input Voltage(V) 4.5 to 40
    Max Output Current(A) 4.0
    Frequency(kHz) 450 to 2,250
    USB PD 3.0 PPS Certification Yes
    Programmable Current Limit Output
    Auxiliary Power Rails Mini-Buck: 350mA; LDO: 20mA
    AEC-Q100 No
    Package Type QFN, 32-pin
    Package(mm) 5 x 5
    RoHS Yes
    Lead Free Yes
    Halogen Free Yes
    ITAR Restricted No
    ECCN EAR99

    ACT4752EVK1-101ACT4752EVK1-101 Evaluation Kit

    ACT4752EVK1-101 Evaluation Tool User's Guide

    This document describes the characteristic and operation of the Qorvo ACT4752EVK1-101 evaluation kit (EVK). It provides setup and operation instructions, schematic, layout, BOM, and test data.

    To communicate with the ACT4752EVK1-101 a USB Dongle and a Graphical User Interface (GUI) is provided.

    This EVK demonstrates the ACT4752QI101 power management IC.

    ACT4752 PCB Layout Files

    ACT4752 GUIACT4752 GUI

    The ACT4752 Graphical User Interface (GUI) is packaged in a ZIP file that includes the software and all necessary drivers to communicate with the ACT4752EVK1-101 Evaluation Tool, as well as all descriptions how to use the tool.