ACT4751M
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
Product Categories
| 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 |
ACT4751EVK1-101 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 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
(QC20191223118)
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
All design details and layout files can be downloaded here. Please contact your Qorvo representative to get additional support.