Synchronous buck regulators are versatile in compact packages
Internal compensation in the SiC476, SiC477, SiC478, SiC 479, SiC466, SiC467, SiC468 and SiC469 synchronous buck regulators reduces the external component count in system design, says Vishay Intertechnology.
The two families of 2.0 to 12A microBuck synchronous buck regulators featuring wide input voltage ranges from 4.5 to 55V (SiC476, SiC477, SiC478 and SiC479) and 4.5 to 60V (SiC466, SiC477, SiC478 and SiC489).
According to Vishay Siliconix, they combine rugged high performance n-channel trench MOSFETs with a controller in a compact 5.0 x 5.0mm PowerPAK package, to deliver high efficiency and power density, while their internal compensation reduces the external component count. The microBuck regulators offer a low 156 microA operating current and peak efficiency up to 98 per cent, to allow designers to increase power density by reducing power losses and cooler operation for improved long term reliability while eliminating the need for a heatsink. The microBuck wide safe operating area gives designers flexibility to support a wide range of operating temperature and current requirements. This allows designers to shrink the PCB size, simplify thermal management, and reduce system costs.
The output is adjustable from 24 to 0.8V, for use in DC/DC converters for industrial and factory automation, home automation, industrial computing, basestation power supplies, 5G network equipment and small cells, wall transformer regulation, robotics, drones, battery management systems, power tools, and vending, ATM, and slot machines.
The SiC46x family devices are the 2.0A SiC469, 4.0A SiC468, 6.0A SiC467 and 10A SiC466, while the SiC47x family devices are the 3.0A SiC479, 5.0A SiC478, 8.0A SiC477 and 12A SiC476. All are footprint-compatible and configurable with adjustable switching frequencies from 100kHz to 2MHz, adjustable soft start and current limits, and two operating modes: forced continuous conduction or power save. The internal compensation in both families eliminates the need for external RC networks.
The microBuck COT architecture delivers fast transient response with minimum output capacitance and tight ripple regulation at light loads. It also enables loop stability regardless of the type of output capacitor used, including low ESR ceramic capacitors, says Vishay. The regulators integrate a robust protection feature set, including output over-voltage protection (OVP), output under-voltage protection (UVP), over-current circuit protection (OCP), short circuit protection (SCP) with auto retry, over-temperature protection (OTP), and a power-good flag.
Samples and production quantities are available now, with lead times of 12 weeks.
