Vishay – New synchronous buck regulators offer high efficiency over wide input-voltage range


The SiC46x series synchronous buck regulators from Vishay operate over a very wide input-voltage range of 4.5V to 60V and provide an output current of up to 10A with high conversion efficiency.

The SiC46x regulators include integrated high- and low-side N-channel trench power MOSFETs, and operate at an adjustable switching frequency of up to 2MHz. The SiC461 is rated for a maximum output current of 10A. The other parts are the 2A SiC464, the 4A SiC463 and the 6A SiC462.

The regulators are capable of providing an adjustable output voltage as low as 0.8V and as high as 90% of the input voltage. The 60V input-voltage rating of the SiC46x devices means that they can handle the kick-back transients caused by motors in power tools, battery- operated vehicles and robotic vacuum and garden equipment. It also makes them suitable for use in a wide variety
of battery packs and high-voltage battery chargers.

The SiC46x regulators’ architecture provides for ultra-fast response to voltage transients with a small requirement for output capacitance. Tight ripple regulation is maintained at very light loads.

The devices are stable with any capacitor, and no external ESR network is required for loop stability. The SiC46x parts also incorporate a power-saving scheme which significantly increases light-load efficiency.

The regulators offer a full set of protection functions, including over-voltage and under-voltage protection and thermal shut-down.


  • 98% peak efficiency
  • ±1% output-voltage accuracy
  • 5μA shut-down current
  • 250μA operating current when enabled but not switching
  • Adjustable soft start and current limit


  • Point-of-load power supplies in telecoms servers
  • Industrial products
  • Industrial computing equipment
  • Vending and slot machines
  • Cellular communications modules
  • Home automation equipment
  • Networking equipment
  • Power tools
  • Factory automation equipment
  • Battery chargers