Vishay Siliconix SIC479EVB-E

Overview

SIC479EVB-E from Vishay Siliconix is an evaluation board designed to demonstrate and validate the SiC479 microBUCK® synchronous buck regulator - a 3 A, 4.5 V to 55 V input, adjustable-output DC/DC converter in MLP55-27L package with internal MOSFETs, 0.8 V reference, and programmable 100 kHz–2 MHz switching frequency. It supports pre-bias startup, power-good signaling, and full protection including OCP, OVP, UVP, and OTP.

For engineers reviewing the SIC479EVB-E datasheet, SIC479EVB-E pinout, SIC479EVB-E application, or SIC479EVB-E equivalent, this board enables rapid prototyping of industrial, telecom, and robotics power supplies using the SiC479 IC - especially where wide VIN, high efficiency (>95% at mid-load), light-load power-save mode, and compact 5 mm × 5 mm layout are critical.

Technical Context

The SIC479EVB-E implements the SiC479 IC in a fully assembled, tested reference design with optimized external components: 4.7 μF VDRV decoupling, 0.1 μF VCIN capacitor, 10 kΩ PGOOD pull-up, and configurable R_fSW, R_MODE, and R_ILIMIT networks. It supports all SiC479 operating modes - forced CCM or diode-emulation power-save - and validates the IC's voltage-mode constant-on-time (COT) control with adaptive zero-current detection.

This board demonstrates the SiC479's key system-level behaviors: stable regulation down to 0.8 V output with ±1% accuracy over –40 °C to +125 °C, ultrafast transient response enabled by internal compensation, and seamless soft-start/pre-bias startup without output voltage reversal. All protections - including valley-current OCP (2 A/3 A/4 A selectable), 150 °C OTP with 35 °C hysteresis, and 25 μs PGOOD blanking - are fully exercised and verified on-board.

Key Specifications

Availability

SIC479EVB-E is available at Aetrix Electronics and suitable for industrial automation, telecom power supply validation, and robotics embedded power design requiring stable component supply, fast time-to-test, and production-ready reference schematics.

Supply support for SIC479EVB-E includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Vishay Siliconix is a global leader in discrete semiconductors and passive components, specializing in high-efficiency power management ICs, MOSFETs, and precision analog solutions for demanding industrial and computing applications.

The SiC47x family - including the SiC479 used on SIC479EVB-E - was engineered for high-density, wide-input DC/DC conversion in space-constrained systems where thermal performance, transient response, and protection robustness are non-negotiable.

FAQ

What is the primary function of the SIC479EVB-E evaluation board?

The SIC479EVB-E is a fully assembled reference design board that demonstrates the operation, performance, and configuration flexibility of the SiC479 synchronous buck regulator IC. It enables engineers to validate power stage behavior, verify protection features (OCP, OVP, OTP), test soft-start and pre-bias startup sequences, and optimize external component selection - all before committing to custom PCB design. The board includes all necessary decoupling, feedback, and mode-setting components for immediate bench testing of the SIC479EVB-E.

Does the SIC479EVB-E support adjustable output voltage, and how is it configured?

Yes, the SIC479EVB-E supports fully adjustable output voltage down to 0.8 V, implemented via the SiC479's VFB pin. On the board, this is achieved using an external resistor divider (R_{FB_H}/R_{FB_L}) between VOUT and AGND. The SiC479 maintains ±1% output voltage accuracy across –40 °C to +125 °C, and the SIC479EVB-E's default configuration delivers a nominal 5 V output - easily reconfigured by changing the top resistor per the formula V_OUT = 0.8 V × (1 + R_{FB_H}/R_{FB_L}).

How does the SIC479EVB-E implement current limiting and protection for the SiC479 IC?

The SIC479EVB-E exposes the SiC479's ILIMIT pin to allow user-selectable valley-current OCP thresholds: 2 A (ILIMIT tied to AGND), 3 A (ILIMIT floating), or 4 A (ILIMIT tied to VDD). All other protections - including output overvoltage (120% VOUT), undervoltage (20% VOUT), overtemperature (150 °C trip), and power-good monitoring - are hardwired and fully operational on the SIC479EVB-E. The board also includes a 10 kΩ pull-up on PGOOD and proper RC filtering on VCIN and BOOT to ensure reliable fault response during evaluation.

Can the SIC479EVB-E be used to evaluate light-load efficiency and power-save mode?

Yes, the SIC479EVB-E fully supports and validates the SiC479's power-save mode, which combines diode emulation and frequency foldback to maximize light-load efficiency. Mode selection is implemented via a resistor on the MODE pin (0–100 kΩ for Mode 1 = power-save enabled). The board's layout and component selection - including low-ESR ceramic output capacitors and optimized gate drive - ensure accurate measurement of quiescent current (156 μA typical) and efficiency down to 1 mA load, confirming the SiC479EVB-E's suitability for always-on and battery-backed applications.

Is the SIC479EVB-E compatible with other members of the SiC47x family?

The SIC479EVB-E is specifically optimized for the SiC479 (3 A variant), but its core layout and interface signals align with the pin-compatible SiC476/SiC477/SiC478 family in the same MLP55-27L package. While component values (e.g., inductor, current-sense resistors) must be adjusted for higher-current variants, the SIC479EVB-E's schematic, footprint, and test points provide a validated starting point for evaluating any SiC47x device - significantly accelerating development across the 3 A to 12 A product range.