Vishay — SiC45x microBUCK® Synchronous Buck Regulators

Vishay SiC45x microBUCK® Synchronous Buck Regulators

Compact voltage regulators offer higher power density and faster transient response

The Vishay family of microBUCK® synchronous buck regulators includes new 15 A, 25 A, and 40 A devices in a thermally-enhanced 5 mm x 7 mm PowerPAK® package. The new SiC45x devices operate from an input-voltage range of 4.5 V to 20 V, and supply an output voltage in the range 0.3 V to 12 V.


With their compact footprint, the 15 A SiC453, 25 A SiC451 and 40 A SiC450 provide higher power density than the previous generation of devices. The regulators’ high power density is the result of co-packaging high-performance N-channel trench MOSFETs with a PWM controller in a single device. Simplifying the design of high-performance point-of-load converters, the integrated devices require few external components for configuration and loop compensation.


The SiC45x constant on-time architecture also provides a very fast response to transient voltages, with minimum output capacitance and tight ripple regulation over a broad range of loads. It also enables loop stability regardless of the type of output capacitor used.


These Vishay regulators include a PMBus 1.3-compliant interface, supporting the implementation of power-system telemetry in complex installations such as data centers and telecoms central offices.


The regulators automatically choose the correct internal compensation values required based on the operating condition during their start-up sequence. At light loads, when the inductor current crosses zero, the control scheme turns off the low-side MOSFET to deploy a diode emulation mode with frequency fold-back.


In ultrasonic mode, the frequency does not go below 25 kHz, keeping the switching frequency above the audible range, which is a benefit for noise-sensitive applications.


  • Programmable switching frequency:
    • 30 kHz to 1,500 kHz
  • Peak efficiency up to 98%
  • Protection functions:
    • Over-voltage
    • Under-voltage
    • Over-current
    • Over-temperature
  • Differential output remote sensing


  • Networking and telecoms equipment
  • Storage systems
  • Distributed point-of-load power architectures
  • Servers
  • Cloud computing
  • Computing infrastructure
  • FPGA and SoC power supplies

Evaluation Board

Board Part Number: SIC451EVB-A

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