Renesas ISL6440EVAL1Z

Overview

ISL6440EVAL1Z from Renesas Electronics is an evaluation board designed to demonstrate the ISL6440IAZ triple-output synchronous buck PWM controller in embedded DC/DC converter applications, supporting 5.6V–24V input, dual regulated outputs (3.3V/2A and 1.8V/2A), fixed 300kHz switching frequency, and independent soft-start and shutdown control.

For engineers reviewing the ISL6440EVAL1Z datasheet, ISL6440EVAL1Z test setup, ISL6440EVAL1Z application circuit, or ISL6440EVAL1Z component bill of materials, this page provides verified configuration details, operating conditions, test equipment guidance, and design implementation notes directly from AN1219 Rev.2.00.

Technical Context

The ISL6440EVAL1Z implements a fully populated reference design for the ISL6440IAZ controller, featuring two independent synchronous buck stages with external MOSFETs (FDS6912A dual NFETs), integrated power-good monitoring, adjustable overcurrent protection via ROCSET resistors (95.3kΩ), and soft-start timing controlled by C3 and C5 (1µF each).

It supports precise output voltage setting via feedback resistor dividers (R5/R6 for 3.3V, R7/R8 for 1.8V), uses POSCAP and ceramic output capacitors (220µF + 10µF per rail), and includes on-board test points (P1–P9) for VIN, VOUT1, VOUT2, SD1, SD2, and PGOOD signal monitoring.

Key Specifications

Availability

ISL6440EVAL1Z is available at Aetrix Electronics and suitable for embedded power design validation, DC/DC converter prototyping, and multi-rail voltage regulator qualification requiring stable component supply and documented reference implementation.

Supply support for ISL6440EVAL1Z 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 manufacturer delivering microcontrollers, analog, power, and SoC solutions for industrial, automotive, and infrastructure markets.

The ISL6440EVAL1Z belongs to Renesas' power management evaluation platform family, developed to accelerate adoption of its high-performance PWM controllers in compact, multi-output embedded power systems.

FAQ

What is the primary function of the ISL6440EVAL1Z evaluation board?

The ISL6440EVAL1Z evaluation board is a fully assembled reference design that demonstrates the operation of the ISL6440IAZ triple-output synchronous buck PWM controller. It enables engineers to validate performance, configure output voltages, test soft-start sequencing, verify overcurrent protection, and monitor power-good status in real-world embedded DC/DC converter applications without custom PCB development.

Which IC does the ISL6440EVAL1Z evaluate, and what are its key supported features?

The ISL6440EVAL1Z evaluates the ISL6440IAZ controller, which delivers dual synchronous buck regulation with fixed 300kHz frequency, independent soft-start and shutdown pins (SS1/SS2, SD1/SD2), power-good monitoring, and adjustable overcurrent protection. The board implements both outputs with FDS6912A dual NFETs, 6.8µH inductors, and POSCAP/ceramic output filtering as specified in AN1219.

How do I adjust the output voltages on the ISL6440EVAL1Z?

Output voltages on the ISL6440EVAL1Z are set by feedback resistor dividers: VOUT1 (3.3V) uses R5 (1kΩ) and R6 (324Ω); VOUT2 (1.8V) uses R7 (1kΩ) and R8 (806Ω). To change either output, replace the corresponding resistor pair using Equation 1 from AN1219: VOUT = 0.8V × (1 + Rupper/Rlower). No soldering of controller pins is required.

What test equipment is recommended for evaluating the ISL6440EVAL1Z?

Renesas recommends a 12V/5A power supply, electronic load, four-channel oscilloscope with probes, and precision digital multimeters. These tools allow full characterization of transient response, efficiency, cross-regulation, soft-start behavior, and PGOOD assertion timing - all validated in the ISL6440EVAL1Z user's manual AN1219 Rev.2.00.

Can the ISL6440EVAL1Z be used to evaluate overcurrent protection settings?

Yes - the ISL6440EVAL1Z supports overcurrent threshold adjustment via ROCSET resistors (R3 and R4, each 95.3kΩ) and current sense resistors (RCS = 1.0kΩ). Equation 3 in AN1219 defines IOC = (7 × RCS) / ROCSET, allowing engineers to tune trip points for each buck stage independently using standard surface-mount resistors and the board's test points.