Renesas ISL8018EVAL3Z

Overview

The ISL8018EVAL3Z from Intersil is an evaluation board designed for the ISL8018 synchronous buck regulator, supporting point-of-load applications with 2.7V–5.5V input and a preset 1.8V/8A output at 1MHz switching frequency. It enables full performance validation including efficiency (>90% at 50% load), low output ripple (<1% of VOUT), and thermal operation from –40°C to +125°C.

For engineers reviewing the ISL8018EVAL3Z datasheet, ISL8018EVAL3Z pinout, ISL8018EVAL3Z application, or ISL8018EVAL3Z equivalent, this board provides hands-on characterization of adjustable frequency (500kHz–4MHz), margining (±10%), soft-start (1ms internal or adjustable), synchronization capability, and prebiased start-up behavior under real load conditions.

Technical Context

This 4-layer FR4 evaluation board implements the ISL8018IRAJZ QFN-20 buck regulator in a fixed 1.8V configuration with 22µF input and 47µF output ceramic capacitance, 0.68–1.5µH inductor, and internal compensation. It supports PWM-only mode by default (S1 = PWM) and delivers up to 8A continuous output current with thermal management via EPAD grounding and multi-via thermal relief.

Key control interfaces include FS for frequency programming, SYNCIN/SYNCOUT for master-slave synchronization with phase shifting, SS for soft-start timing adjustment, VSET for ±10% voltage margining, and ISET for configurable current limit (3A/5A/8A). All functions are accessible via on-board toggle switches (S1–S5) and test points.

Key Specifications

Availability

The ISL8018EVAL3Z is available at Aetrix Electronics and suitable for FPGA power delivery, ASIC core voltage evaluation, and industrial DC-DC converter development requiring stable component supply and repeatable lab validation.

Supply support for ISL8018EVAL3Z 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

Intersil Corporation (now part of Renesas Electronics) is a semiconductor company specializing in precision analog, power management, and interface ICs for industrial, computing, and communications markets.

The ISL8018EVAL3Z belongs to Intersil's high-efficiency synchronous buck regulator evaluation platform family, engineered to accelerate design-in of low-quiescent-current, high-current PoL solutions for advanced digital processors and programmable logic devices.

FAQ

What is the primary function of the ISL8018EVAL3Z?

The ISL8018EVAL3Z is a dedicated evaluation board for the ISL8018 synchronous buck regulator IC. Its primary function is to enable complete performance validation-including efficiency, transient response, thermal behavior, and control loop stability-under real-world operating conditions. The ISL8018EVAL3Z simplifies bench testing by providing pre-configured 1.8V/8A output, on-board switches for mode selection, and accessible test points for oscilloscope and load measurements.

Can the ISL8018EVAL3Z be used to evaluate output voltages other than 1.8V?

Yes, the ISL8018EVAL3Z can evaluate output voltages from 0.6V to 5V by modifying the feedback resistor network (R1/R2). While the board ships preset to 1.8V, Equation 4 in the user manual defines the relationship between R1, R2, and VOUT. For example, changing R1 to 150kΩ sets VOUT to 1.5V. External compensation and feedforward capacitor (C4) adjustments may be required for optimal stability at non-default voltages.

How does the ISL8018EVAL3Z support synchronization between multiple converters?

The ISL8018EVAL3Z supports synchronization via its SYNCIN and SYNCOUT pins, enabling master-slave configurations across multiple ISL8018-based boards. SYNCIN accepts external clock signals from 500kHz to 4MHz, while SYNCOUT delivers a 250µA current pulse synchronized to the highest-frequency clock source. Phase shifting is achieved by adding a capacitor (e.g., C13) between SYNCOUT and SYNCIN of the slave board, with time delay calculated per Equation 3 in the manual.

What are the key thermal design features of the ISL8018EVAL3Z?

The ISL8018EVAL3Z incorporates thermal design features aligned with the ISL8018IRAJZ QFN-20 package: a large EPAD connected to an internal ground plane, five or more vias under the thermal pad for heat conduction to inner layers, and wide, short power loops to minimize resistive losses. These features ensure reliable operation across the full –40°C to +125°C junction temperature range during sustained 8A output testing.

Does the ISL8018EVAL3Z support both PWM and PFM modes?

No-the ISL8018EVAL3Z is configured exclusively for PWM mode. Switch S1 must be set to position "1" (PWM) to enable fixed-frequency operation; position "3" (PFM) forces continuous conduction mode but does not activate true pulse-frequency modulation. The board lacks hardware support for automatic PFM entry/exit, and all published performance data (efficiency curves, ripple, transients) assume PWM operation at the configured switching frequency.