Active-Semi Solutions for Sustainability
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Product Features

  • USB Certified Charger Design Available
  • 50 mΩ Integrated High- / Low- Side FETs
  • 4.5 to 40 V Operational Input Voltage
  • 5 V Bias, 350 mA Buck Converter
  • Programmable Output Voltage by I2C from 3 to 24V in 12.5 mV steps
  • Programmable Output Current Limit from 0 to 4A in 256 Step Resolution
  • Fixed-Frequency Current-Mode Control from 450k to 2.25 MHz with External Clock Sync, and a 100% Duty Operation
  • Out of AM Radio / Spread-Spectrum Operation
  • 20 mA AUX LDO Programmable Output Voltage from 0.9 to 4.0V
  • I2C Interface, Fast-mode Plus (Fm+, 1 MHz) with Configurable Address
  • Protections:
    • UVLO, OVP, UVP (Hiccup/Latch-off), OCP, TSD
  • Thermally Enhanced 5×5 mm QFN Package
Part Number AEC-Q100 Switching
Default Output
Default AUX LDO
ACT4751QI101 No Programmable
450kHz to 2.25MHz
Current mode 5.0V 4.0A 3.3V
The ACT4751 is a programmable DC-to-DC buck converter with bias supply rails for microcontrollers or USB PD controllers. It supports a wide input voltage of 4.5 V to 40 V and uses a synchronous step-down (buck) voltage regulator architecture. It integrates both the high side and low side MOSFETS. These 50mΩ RDSON transistors enable high efficiency to reduce power losses.
The ACT4751 main buck converter can be dynamically programed to an output voltage between 3 V and 24 V in 12.5 mV steps via the I2C or analog feedback. Also it can dynamically program output current between 0 A to 4 A in 256 steps via the I2C 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. The ACT4751 is a perfect solution for USB Power Delivery (PD) 3.0 and Programmable Power Supply (PPS) applications.
The ACT4751 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 1.5W VCONN line in active USB-C cables.
The ACT4751 is available in a 32-pin 5mm x 5mm QFN package with a power optimized footprint and exposed pad for improved thermal performance.

ACT4751EVK1-101 Evaluation Tool User’s Guide

This document describes the characteristic and operation of the Active-Semi?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. Download the GUI and all documentation here or in the Software TAB

五分快三计划The ACT4751EVK1-101 demonstrates the ACT4751QI-101 power management IC.



Altium Files

ACT4751 Altium Symbol & Footprint

ACT4751-GUI The 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