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Vishay microBUCK® Regulators

Increase power density and transient response with output current up to 40 A in a compact PowerPAK® package

The Vishay SiC45x is a PMBus 1.3 compliant non-isolated DC/DC buck regulator with integrated MOSFETs. Capable of supplying up to 40 A (SiC450) continuous output current, the SiC45x output voltage is digitally adjustable from 0.3 V to 12 V from a 4.5 V to 20 V input with switching frequencies up to 1.5 MHz.

Vishay’s SiC45x architecture delivers ultrafast transient response with minimum output capacitance and tight regulation over a broad load range. The regulator has integrated internal compensation and is stable with any type of output capacitor. The SiC45x incorporates a power saving scheme that significantly increases light load efficiency.

Allowing power block configuration programs to be stored in non-volatile memory (NVM), various operation parameters of the Vishay SiC45x can all be locally stored and used to determine fault behavior. Operation is firmware-based and a field upgradable Pinstrap option is also available for default configuration without PMBus.

The SiC45x is available in lead (Pb)-free power enhanced MLP 5 mm x 7 mm package.


  • Versatile
    • Single supply operation from 4.5 V to 20 V input voltage
    • Scalable solution with continuous output current of 40 A (SiC450), 25 A (SiC451), 15 A (SiC453)
    • Adjustable output voltage from 0.3 V to 12 V
    • Built in 5 V regulator for internal circuits and driver supply
    • 1 % output voltage accuracy over temperature
    • Ultrafast transient response
  • Highly efficient
    • 98 % peak efficiency
    • Optional power save mode
  • Highly configurable
    • PMBus 1.3 compliant with 1 MHz bus speed
    • Internal NVM
    • VOUT adjustability and reading resolution of 2 mV
    • Supports over 50 PMBus commands
    • Supports in phase or 180° out of phase synchronization
    • Output voltage source and sink capability
  • Robust and reliable
    • PVIN, VOUT, IIN and IOUT and temperature reporting
    • Over current protection in pulse-by-pulse mode
    • Output over and under voltage protection
    • Over temperature protection with hysteresis
    • Differential output remote sensing


  • Server, cloud, and infrastructure
  • Networking, telecom, storage applications
  • Distributed point of load power architectures
  • DDR memory

SiC45x Typical Application Circuit


SiC45x Typical Application Circuit


SiC45x Functional Block Diagram

Vishay – SiC45x Functional Block Diagram
Vishay – SiC45x microBuck® DC/DC Converter


microBUCK® POL Solutions with PMBus Interface for Scalability, Ease of Use, and High Efficiency