Meet Power Demands with Precision: Qorvo’s ACT4751M Tackles USB PD and Automotive Design Challenges
As system designers continue to push the envelope in automotive, USB PD, and high-performance LED applications, managing power efficiently and flexibly has become increasingly complex. Today’s designs demand compact, high-efficiency voltage regulation across wide input ranges, often under stringent thermal and EMI constraints. Whether supporting fast-charging protocols like USB PD 3.0, PPS or powering microcontrollers and VCONN lines in USB-C cables, engineers need versatile regulators that meet both space and performance requirements without compromising robustness or reliability.
Qorvo’s new ACT4751M directly addresses these design hurdles with a highly programmable, automotive-grade buck regulator optimized for compact, thermally constrained environments. With an input range of 4.5V to 40V, the ACT4751M integrates both high-side and low-side MOSFETs (50 mΩ each) to achieve high conversion efficiency while minimizing board space. Engineers can dynamically program output voltage from 3V to 24V in 12.5 mV increments via I²C or analog feedback, with current output adjustable up to 4A in 256 steps in constant-current mode. Ideal for USB Fast Charging and Quick Charge 4+ designs, it features a mini 5V / 350 mA buck and a 20 mA AUX LDO (0.9V–4.0V) for powering control ICs and USB-C VCONN lines. Its proprietary current-mode control features external clock sync switching frequencies 450 kHz–2.25 MHz, out of AM and spread spectrum operation.
What are the key features/specifications of the ACT4751M?
- AEC-Q100 Grade 1 qualified: -40°C to +125°C
- Wide 4.5V to 40V input range
- Programmable output: 3V to 24V in 12.5 mV steps via I²C
- Adjustable output current: 0 to 4A in 256-step resolution
- Integrated 5V / 350 mA mini-buck and 0.9–4.0V / 20 mA AUX LDO
- Spread-spectrum and AM-band frequency avoidance
- External clock sync from 450 kHz to 2.25 MHz
- Side-wall-plated 5 mm x 5 mm QFN package for optimal thermal performance
- Fast-mode plus I²C (1 MHz), configurable device address
- Full protection suite: UVLO, OVP, UVP (hiccup/latch-off), OCP, TSD
What are common markets/applications?
- USB Fast Charger PD 3.0 and PPS chargers
- Quick Charge 4+/4/3.0 systems
- Automotive infotainment and control modules
- High-power LED lighting systems
- Controller and VCONN active USB-C power rails
About Kirk Barton
Kirk Barton is a Technical Marketing Manager for Power Products at RFMW. Leveraging 35 years of industry experience and a degree in Electrical Engineering, Kirk specializes in high power applications using wide bandgap technologies. Kirk enjoys being part of the RF industry’s innovative environment and witnessing the positive impact that technological advances have on integration, efficiency, and end applications.
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