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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
| Topology | Buck Converter |
| Input voltage | 4-40 V |
| Switching frequency | 450-2250 kHz |
| Output 1 | 24 V / 4 A |
| IC revision | REF01 |
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
- High Power LED Lighting
- USB PD 3.0 Charging Hub / Power Management for All USB-C Power Rails
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | λDom typ.(nm) | Emitting Color | λPeak typ.(nm) | IV typ.(mcd) | VF typ.(V) | Chip Technology | 2θ50% typ.(°) | C | Tol. C | VR(V (DC)) | Size | Operating Temperature | DF(%) | RISO | Ceramic Type | L(mm) | W(mm) | H(mm) | Fl(mm) | Packaging | L(µH) | IR(A) | ISAT(A) | RDC(mΩ) | fres(MHz) | IRP,40K(A) | ISAT,30%(A) | RDC typ.(mΩ) | RDC max.(mΩ) | Mount | Endurance(h) | IRIPPLE(mA) | ILeak(µA) | Pitch(mm) | Ø D(mm) | RESR(mΩ) | Interface Type | Type | Gender | Pins | PCB Thickness(mm) | Working Voltage(V (DC)) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WL-SMCW SMT Mono-color Chip LED Waterclear, 470 nm, Blue | Downloads27 files RAY files
| Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWL-SMCW SMT Mono-color Chip LED Waterclear | Dominant Wavelength [typ.]470 nm | Emitting ColorBlue | Peak Wavelength [typ.]465 nm | Luminous Intensity [typ.]145 mcd | Forward Voltage [typ.]3.2 V | Chip TechnologyInGaN | Viewing Angle Phi 0° [typ.]140 ° | – | – | – | Size0603 | Operating Temperature -40 °C up to +85 °C | – | – | – | Length1.6 mm | Width0.8 mm | Height0.7 mm | – | PackagingTape and Reel | – | – | – | – | – | – | – | – | – | MountSMT | – | – | – | – | – | – | – | – | – | – | – | – | |||
 | WE-XHMI SMT Power Inductor, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-XHMI SMT Power Inductor | – | – | – | – | – | – | – | – | – | – | Size8080 | Operating Temperature -40 °C up to +125 °C | – | – | – | Length8.8 mm | Width8.3 mm | Height7.8 mm | – | – | Inductance4.7 µH | Rated Current9.5 A | – | DC Resistance8.65 mΩ | Self Resonant Frequency22 MHz | Performance Rated Current13.35 A | Saturation Current @ 30%16.65 A | DC Resistance8.65 mΩ | DC Resistance9.51 mΩ | MountSMT | – | – | – | – | – | – | – | – | – | Pins2 | – | – | ||||
 | WCAP-ATG8 Aluminum Electrolytic Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-ATG8 Aluminum Electrolytic Capacitors | – | – | – | – | – | – | – | Capacitance100 µF | Capacitance±20% | Rated Voltage50 V (DC) | – | – | Dissipation Factor10 % | – | – | Length11.5 mm | – | – | – | PackagingAmmopack | – | – | – | – | – | – | – | – | – | – | Endurance 2000 | Ripple Current286 mA | Leakage Current50 µA | Pitch3.5 mm | Diameter8 mm | – | – | – | – | – | – | – | ||||
 | WCAP-PTHR Aluminum Polymer Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-PTHR Aluminum Polymer Capacitors | – | – | – | – | – | – | – | Capacitance100 µF | Capacitance±20% | Rated Voltage35 V (DC) | – | – | Dissipation Factor12 % | – | – | Length12.5 mm | – | – | – | PackagingAmmopack | – | – | – | – | – | – | – | – | – | MountRadial THT | Endurance 2000 | Ripple Current3700 mA | Leakage Current700 µA | Pitch5 mm | Diameter10 mm | ESR25 mΩ | – | – | – | – | – | – | ||||
| WCAP-CSGP MLCCs 50 V(DC), –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | – | – | – | – | – | – | – | Capacitance2.2 µF | Capacitance±10% | Rated Voltage50 V (DC) | Size1812 | Operating Temperature -55 °C up to +125 °C | Dissipation Factor2.5 % | Insulation Resistance0.2 GΩ | Ceramic TypeX7R Class II | Length4.5 mm | Width3.2 mm | Height2.5 mm | Pad Dimension0.75 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | |||||
 | WE-LQS SMT Power Inductor, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-LQS SMT Power Inductor | – | – | – | – | – | – | – | – | – | – | Size4025 | Operating Temperature -40 °C up to +125 °C | – | – | – | Length4 mm | Width4 mm | Height2.5 mm | – | – | Inductance47 µH | Rated Current0.71 A | Saturation Current0.45 A | DC Resistance492 mΩ | Self Resonant Frequency15 MHz | – | – | – | – | MountSMT | – | – | – | – | – | – | – | – | – | – | – | – | ||||
 | WR-USB Type C Connectors, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-USB Type C Connectors | – | – | – | – | – | – | – | – | – | – | – | Operating Temperature -40 °C up to +105 °C | – | Insulation Resistance1000 MΩ | – | – | – | – | – | PackagingTape and Reel | – | Rated Current5 A | – | – | – | – | – | – | – | MountTHR | – | – | – | – | – | – | Interface TypeType C | TypeHorizontal | GenderReceptacle | Pins24 | PCB Thickness1 mm | Working Voltage48 V (DC) | |||
 | WR-USB Standard Connectors, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-USB Standard Connectors | – | – | – | – | – | – | – | – | – | – | – | Operating Temperature -40 °C up to +105 °C | – | Insulation Resistance1000 MΩ | – | – | – | – | – | PackagingTray | – | Rated Current1.5 A | – | – | – | – | – | – | – | MountSMT | – | – | – | – | – | – | Interface TypeType A | TypeHorizontal | GenderReceptacle | Pins4 | – | Working Voltage30 V (DC) |