SiC47x and SiC46X - 2A to 12A Synchronous Buck Regulators with 98% Peak Efficiency

3 December 2019 - 0 Comments

Vishay Intertechnology has introduced new microBuck synchronous buck regulator featuring wide input voltage ranging from 4.5V to 55V (SiC476/7/8/9) and 4.5V to 60V (SiC466/7/8/9). By combining rugged high-performance n-channel trench MOSFETs with a controller in the compact 5x5 PowerPAK package, these devices can deliver high efficiency and power density, while their internal compensation reduces the external component count. These regulators offer a low 156 µA operation current and peak efficiency up to 98% and allow designers to increase power density by reducing power losses. These modules allow the designers to shrink the PCB size, simplify thermal management, and reduce system costs. With an adjustable output voltage from 24 V down to 0.8 V, SiC46x and SiC47x family regulators are ideal for a wide range of applications. These include DC/DC converters for industrial and factory automation, home automation, industrial computing, base station power supplies, 5G network equipment, and, and slot machines.

Features of SiC466/7/8/9:

Single supply operation from 4.5 V to 60 V input voltage
Adjustable output voltage down to 0.8 V
98 % peak efficiency
Adjustable switching frequency from 100 kHz to 2 MHz
Adjustable soft start and selectable preset 100 %, 75 %, and 50 % current limit
Over-voltage protection, Under-voltage, Short circuit protection

Features of SiC476/7/8/9:

Single supply operation from 4.5 V to 55 V input voltage
Adjustable output voltage down to 0.8 V
Scalable solution 3 A (SiC479), 5 A (SiC478), 8 A (SiC477), 12 A (SiC476)
Highly efficient - 98 % peak efficiency - 4 μA supply current at shutdown - 156 μA operating current
Adjustable switching frequency from 100 kHz to 2 MHz
Adjustable soft start and selectable preset 100 %, 75 %, and 50 % current limit

Note: More technical details on the SiC47x series can be found in the datasheet linked at the bottom of this page.

The microBUCK COT architecture delivers ultrafast 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. The regulators integrate a robust protection feature set, including output overvoltage protection (OVP), output under-voltage protection (UVP), overcurrent circuit protection (OCP), short circuit protection (SCP) with auto-retry, over-temperature protection (OTP), and a power-good flag. Samples and production quantities of the SiC466/7/8/9 and SiC476/7/8/9 families are available now, with lead times of 12 weeks. For more information on SiC466/7/8/9 and SiC476/7/8/9 families visit the respective product page on the official website.