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Qorvo ACT4751 | Demoboard ACT4751EVK1-101 User’s Guide

USB PD 3.0 Power IC with 40V Input Voltage, 4A, Programmable Output Voltage and Current

Overview

TopologyBuck Converter
Input voltage4-40 V
Switching frequency450-2250 kHz
Output 124 V / 4 A
IC revisionREF01

Description

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 sideMOSFETS. 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 modecontrol 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 minibuck 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.

Features

  • USB Certified Charger Design Available
  • 4.5 V to 40 V Operational Input Voltage
  • Programmable Output Voltage by I2C 3 V to 24 V in 12.5 mV Step
  • Programmable Output Current Limit 4 A in 256 Step Resolution
  • Fixed-Frequency Current-Mode Control from 450k to 2.25 MHz with External Clock Sync and 100% Duty Operation
  • Out of AM Radio / Spread-Spectrum Operation
  • 50 mΩ Integrated High-Side / Low-Side FETs
  • 5 V / 350 mA Bias Buck Converter
  • 20 mA AUX LDO, Programmable Output Voltage
  • I2C Interface, Fast-mode Plus (Fm+, 1 MHz) with Configurable Address
  • Protections:
    • UVLO, OVP, UVP (Hiccup/Latch-off), OCP, TSD
  • Thermally Enhanced 5 mm × 5 mm QFN Package

Typical applications

  • Industrial SMPS for 24V Bus
  • USB PD 3.0 Charging Hub / Power Management for All USB-C Power Rails
  • High Power LED Lighting

More information

Products

Order Code Data­sheet Downloads Product seriesλDom typ.
(nm)
Emitting ColorλPeak typ.
(nm)
IV typ.
(mcd)
VF typ.
(V)
Chip Technology50% typ.
(°)
CVR
(V (DC))
Endurance
(h)
Operating TemperatureIRIPPLE
(mA)
ILeak
(µA)
DF
(%)
Pitch
(mm)
Ø D
(mm)
L
(mm)
Technical ReferenceRESR
(mΩ)
Tol. CSizeRISOCeramic TypeW
(mm)
H
(mm)
L
(µH)
IR
(A)
ISAT
(A)
RDC
(mΩ)
fres
(MHz)
ApplicationInterface TypeTypePCB Thickness
(mm)
GenderPinsMountIR 1
(A)
Working Voltage
(V (DC))
Packaging Samples
150060BS75000
STE ALT EAG LTS PSP CAD IGSWL-SMCW SMT Mono-color Chip LED Waterclear 470 Blue 465 145 3.2 InGaN 140 -40 °C up to +85 °C 1.6 0603 0.8 0.7 SMT Tape and Reel
74439358047
STE ALT EAG CAD LTS PSP SPE IGS CADWE-XHMI SMT Power Inductor -40 °C up to +125 °C 8.8 8080 8.3 7.8 4.7 9.5 20.5 8.65 25 2 SMT
860010674014
STE ALT EAG CAD LTS PSP CADWCAP-ATG8 Aluminum Electrolytic Capacitors100 µF 50 2000 -40 °C up to +85 °C 286 50 10 3.5 8 11.5 ATBE115101M050DSPA7B000 ±20%
870055675009
STE ALT EAG CAD LTS PSP CADWCAP-PTHR Aluminum Polymer Capacitors100 µF 35 2000 -55 °C up to +105 °C 3700 700 12 5 10 12.5 PTEF125101M035DSPA9B000 25 ±20%
885012210032
STE ALT EAG CAD LTS PSP CADWCAP-CSGP MLCCs 50 V(DC)2.2 µF 50 2.5 4.5 X7R1812225K050DFCT10000 ±10% 1812 X7R Class II 3.2 2.5
74404043470A
STE ALT EAG CAD LTS PSP SPE IGS CADWE-LQS SMT Power Inductor -40 °C up to +125 °C 4 4025 4 2.5 47 0.71 0.45 492 15 SMT
632723100011
IGE STE 3D ALT EAG CADWR-COM USB 3.1 Type C Receptacle Horizontal THR / SMT1000 MΩ 5 USB 3.1 Type C Horizontal 1 Receptacle 24 THR 20 Tape and Reel
62900416021
STE 3D ALT EAG IGS CADWR-COM USB 2.0 SMT Type A Horizontal -40 °C up to +105 °C1000 MΩ 1.5 USB 2.0 Type A Horizontal Receptacle 4 SMT 1.5 30 Tray
Samples
Order Code Data­sheet Downloads Product seriesλDom typ.
(nm)
Emitting ColorλPeak typ.
(nm)
IV typ.
(mcd)
VF typ.
(V)
Chip Technology50% typ.
(°)
CVR
(V (DC))
Endurance
(h)
Operating TemperatureIRIPPLE
(mA)
ILeak
(µA)
DF
(%)
Pitch
(mm)
Ø D
(mm)
L
(mm)
Technical ReferenceRESR
(mΩ)
Tol. CSizeRISOCeramic TypeW
(mm)
H
(mm)
L
(µH)
IR
(A)
ISAT
(A)
RDC
(mΩ)
fres
(MHz)
ApplicationInterface TypeTypePCB Thickness
(mm)
GenderPinsMountIR 1
(A)
Working Voltage
(V (DC))
Packaging Samples