Renesas ISL8120EVAL4Z

Overview

ISL8120EVAL4Z from Renesas Electronics is an evaluation board designed to demonstrate the performance of the ISL8120 dual-phase synchronous buck PWM controller in 2-phase single-output configurations, delivering up to 50A at 1.2V from a 12V input, with integrated Renesas LFPAK MOSFETs, 320nH PULSE inductors, and SANYO POSCAP output capacitors.

For engineers reviewing the ISL8120EVAL4Z datasheet, ISL8120EVAL4Z setup procedure, ISL8120EVAL4Z test points (TP1–TP4), or ISL8120EVAL4Z parallel operation configuration, this page provides verified board-level specifications, validated test data (efficiency, load transient, ripple), and application-ready implementation guidance for high-current DC/DC converter development.

Technical Context

The ISL8120EVAL4Z implements a fixed 500kHz switching frequency with phase-shifted dual-buck topology, supporting 2-phase interleaved operation for reduced input/output ripple and improved thermal distribution. It integrates the ISL8120IRZ QFN-32 controller with dedicated EN/FF pins for UVLO programming, ISHARE for current-sharing, and CLKOUT/FSYNC for synchronization across multiple boards.

Board-level design includes remote sense capability via TP2/TP3, programmable output voltage (0.6V–3.0V) using R26/R6 feedback dividers, and configurable UVLO thresholds (e.g., 2.94V low / 3.2V high) via R20/R21. Parallel operation is enabled through JP5 (ISHARE), JP6 (FSYNC), and JP9 (EN/FF) jumpers per AN1607 Rev.2.00.

Key Specifications

Availability

ISL8120EVAL4Z is available at Aetrix Electronics and suitable for high-current server VRMs, telecom power modules, and FPGA/ASIC core voltage regulation requiring stable component supply, repeatable lab validation, and scalable multi-board parallel architectures.

Supply support for ISL8120EVAL4Z 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

Renesas Electronics Corporation is a global semiconductor leader specializing in microcontrollers, analog power management, and timing solutions for industrial, automotive, and communications markets.

The ISL8120EVAL4Z belongs to Renesas' high-performance DC/DC evaluation platform family, engineered to accelerate adoption of multi-phase buck controllers in demanding power delivery applications where efficiency, transient response, and layout reproducibility are critical.

FAQ

What is the primary function of the ISL8120EVAL4Z evaluation board?

The ISL8120EVAL4Z evaluation board is a fully assembled, tested platform for demonstrating the ISL8120 dual-phase synchronous buck controller in 2-phase single-output mode. It delivers up to 50A at 1.2V from a 12V input and includes all necessary power components-LFPAK MOSFETs, 320nH inductors, and 4×470µF POSCAP output capacitors-to validate performance metrics such as efficiency, load transient response, and ripple per AN1607 Rev.2.00.

How do I configure the ISL8120EVAL4Z for a different output voltage?

To adjust the output voltage on the ISL8120EVAL4Z, replace resistors R26 and R6 per Equation 1 in AN1607: V_OUT = V_REF × (1 + R26/R6), where V_REF = 0.6V. The board is preset to 1.2V using 200Ω for both resistors. For example, changing R26 to 400Ω yields 1.8V. Ensure feedback divider accuracy (1% tolerance) and verify stability with scope measurements at TP1.

Can multiple ISL8120EVAL4Z boards be operated in parallel? If so, how?

Yes, the ISL8120EVAL4Z supports parallel operation for higher current capacity. Per AN1607 Section "Parallel Operation for Current Sharing Application", configure both boards by setting R5 to 100Ω, connecting JP5 (ISHARE), JP9 (EN/FF), and JP10→JP6 (CLKOUT→FSYNC) between boards, then tying inputs and outputs together. This enables synchronized switching and active current sharing without external master controller.

What test equipment is required to evaluate the ISL8120EVAL4Z?

Evaluating the ISL8120EVAL4Z requires a 0–22V/20A+ power supply, two electronic loads capable of sinking up to 30A each, a 100MHz quad-trace oscilloscope (for TP1 waveform capture), and digital multimeters for DC voltage/current measurement. Remote sensing validation uses TP2/TP3 with appropriate resistor divider adjustments per AN1607 Page 2.

Where are the key signal test points located on the ISL8120EVAL4Z board?

The ISL8120EVAL4Z features four labeled test points: TP1 is a compact scope probe socket for output waveform analysis; TP2 and TP3 serve as remote sense inputs (VSEN1+/VSEN1−) for precision regulation; TP4 monitors the PGOOD signal (green LED2 = high, red = low). All are documented in AN1607 Figures 1 and schematic, with physical locations shown in Figures 4–12.