40 V, 4 A, High-Efficiency, Programmable Synchronous Step-Down Converter for Automotive

    Key Features

    • AEC-Q100 Grade 1: -40 to +125°C
    • CISPR 25 Class 3: PASS
    • Certified USB Fast Charger, Reference Designs
    • Qualcomm Certified, Quick Charger 4+ Designs
    • 4.5 to 40 V operational input voltage
    • Programmable output voltage by I2C from 3 to 24 V in 12.5 mV steps
    • Programmable output current limit from 0 to 4 A in 256 step resolution
    • Automotive, side-wall-plating, 5 mm x 5 mm QFN package

    Qorvo's ACT4751M is an automotive grade, programmable voltage regulator 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) DC-to-DC architecture. It integrates both the high side and low side MOSFETS. These 50 mOhm on-resistance transistors enable high efficiency to reduce power losses.

    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 with features of 100% duty, out-of-AM radio frequency and spread-spectrum operation.

    ACT4751M is a perfect solution for USB Fast Charger applications based on the 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 of 0.9 V to 4.0 V to simplify application system designs. These rails can power up a controller and the 1.5 W VCONN line in active USB-C cables.

    ACT4751M provides an I2C port supporting fast-mode plus (Fm+, 1 MHz) with configurable address and also provides a full set of protections including UVLO, over-voltage input voltage lockout, OVP, UVP (Hiccup/Latch-off), OCP and TSD.

    ACT4751M is available in an AEC-Q100 grade, step-cut, side-wall-plating, 32-pin 5mm x 5mm QFN package with a power optimized footprint and exposed pad for improved thermal performance.

    Typical Applications

      • USB Fast Charger (PD 3.0 PPS), USB PD Charger
      • Quick Charge 4+, Quick Charge 4, Quick Charge 3.0
      • High Power LED Lighting
    Topology Buck
    Min Input Voltage(V) 4.5
    Max Input Voltage(V) 40
    Min Output Voltage(V) 3
    Max Output Voltage(V) 24
    Max Output Current(A) 4.0
    Iq (typ)(mA) 1.3
    Pin Count 32
    Operating Junction Temperature(C) -40 to 150
    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 Yes
    Package Type QFN, 32-pin with step-cut & side-wall-plating
    Package(mm) 5 x 5
    RoHS Yes
    Lead Free Yes
    Halogen Free Yes
    ITAR Restricted No
    ECCN EAR99

    ACT4751EVK1-101ACT4751EVK1-101 Evaluation Kit

    ACT4751EVK1-101 Evaluation Tool User's Guide

    This document describes the characteristic and operation of the Qorvo ACT4751EVK1-101 evaluation kit (EVK). It provides setup and operation instructions, schematic, layout, BOM, and test data.

    To communicate with the ACT4751EVK-101 a USB Dongle and a Graphical User Interface (GUI) is provided.

    The ACT4751EVK1-101 demonstrates the ACT4751QI-101 power management IC.

    ACT4751 Altium Layout Files

    ACT4751 GUIACT4751 GUI

    The ACT4751 Graphical User Interface (GUI) is packaged in a ZIP file that includes the software and all necessary drivers to communicate with the ACT4751EVK1-101 Evaluation Tool, as well as all descriptions how to use the tool.

    ACT4751M-101-REF05 Reference Design

    Qualcomm® Certified Quick Charge 4+ 80W ×2, Quick Charge 3.0 60W ×2, USB Power Charging Hub with Cypress CCG3PA

    QC Logos Reference Design Photo

    See Charger 80W and FAST CHARGER 80W designs, based on the same PCB.

    Qorvo achieved qualification for a Quick Charge 4+ and Quick Charge 3.0 reference design with the automotive AEC-Q100 device ACT4751M and a PD controller from Cypress (CCG3PA).

    These USB-C™ channels supports programmable 80W output voltage and current Quick Charge 4+.

    Voltage programming range: 3V to 21V in 20mV steps
    Current programming range: 1A to 4A in 50mA steps

    These Type-A channels supports programmable 60W output voltage Quick Charge 3.0 (and Quick Charge 2.0).

    Voltage programming range: 5V to 20V in 200mV step (Quick Charge 3.0)
    Voltage programming range: 5V / 9V/ 12V / 20V

    Block Diagram

    All design details and layout files can be downloaded here. Please contact your Qorvo representative to get additional support.