microBUCK regulator delivers up to 75W output power

28th December 2018

Mick Elliott

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Datasheet

The power ICs line at New Yorker Electronics has been upgraded by the Vishay Siliconix SiC462 4.5V to 60V Synchronous microBUCK Regulator. The SiC462 is a synchronous buck regulator with integrated high-side and low-side power MOSFETs. It is a high-efficiency buck regulator with a power state capable of supplying a continuous current of 6A at a switching frequency of up to 1MHz.

This regulator produces an adjustable output voltage down to 0.8V from 4.5V to 60V input rail to accommodate a variety of applications, including computing, consumer electronics, telecom and industrial.

The device has a programmable switching frequency of 100kHz to 2MHz.

Its control scheme is based on voltage mode constant-on time, so it delivers ultra-fast transient response with minimum output capacitance and tight ripple regulation at a very light load.

The SiC462 is stable with any capacitor and its power saving scheme significantly increases light load efficiency by enabling diode emulation mode and frequency fold-back as the load decreases.

It also enables loop stability – regardless of the type of output capacitor used, including low-ESR ceramic capacitors, therefore no external ESR network is required for loop stability.

A full set of protection and monitoring features, include Output Overvoltage Protection (OVP) by pulse mode, Output Undervoltage Protection (UVP) with device latch and Thermal Shutdown (OTP) with hysteresis.

The device has UVLO for input rail and a user programmable soft start as well as dedicated enable pin for easy power sequencing and a Power Good Open Drain Output.

It is available in lead (Pb)-free power enhanced MLP55-27L package to deliver high power density and minimise PCB area.

A raft of applications include Point-of-Load Power Supplies in Telecoms Servers, Base Station Power Supplies, Wall Transformer Regulation, Robotics, Drones, Power Tools and Vending, ATM and Slot Machines.