Renesas ISL8033DEMO1Z

Overview

ISL8033DEMO1Z from Intersil (now Renesas) is a dual-channel evaluation board for the ISL8033 dual 3A synchronous buck regulator IC, designed to demonstrate high-efficiency DC/DC conversion in compact low-voltage systems. It supports independent 1.8V/3A outputs, operates from 2.85V–6V input, features 1MHz fixed switching frequency, 180° out-of-phase channel operation, and integrated power-good signaling.

For engineers reviewing the ISL8033DEMO1Z datasheet, ISL8033DEMO1Z application, ISL8033DEMO1Z setup, or ISL8033DEMO1Z design reference, this board enables rapid validation of dual-rail POL power delivery for FPGA, µP, and Li-ion-powered embedded systems - with pre-validated layout, thermal performance, and transient response per ISL8033 specifications.

Technical Context

The ISL8033DEMO1Z implements the ISL8033 dual buck controller in a fully assembled 24-pin QFN-based reference design, featuring two independent 3A channels with internal P/N-MOSFETs, 0.8V feedback reference, and 1ms independent Power-Good timers. It uses 1.5µH shielded inductors, 2×22µF X5R ceramic output capacitors per channel, and 12pF compensation caps aligned with Table 1 of FN6854 Rev 2.00.

Board-level design incorporates dedicated VIN1/VIN2 inputs, separate EN1/EN2 controls, SYNC pin termination for external clocking up to 6MHz (ISL8033 variant), and exposed thermal pad grounding via multiple vias - all optimized to replicate production-ready thermal and EMI behavior of the ISL8033 IC under real load conditions.

Key Specifications

Availability

ISL8033DEMO1Z is available at Aetrix Electronics and suitable for FPGA power sequencing, µP core voltage regulation, and Li-ion battery-powered portable instrumentation requiring stable component supply and proven reference design validation.

Supply support for ISL8033DEMO1Z 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 (formerly Intersil) is a global semiconductor leader specializing in analog, power management, and embedded processing solutions for industrial, automotive, and communications markets.

The ISL8033DEMO1Z belongs to Renesas' precision DC/DC evaluation platform family, engineered to accelerate design-in of high-efficiency, low-quiescent-current buck regulators for space-constrained, battery-sensitive applications.

FAQ

What is the primary function of the ISL8033DEMO1Z?

The ISL8033DEMO1Z is an evaluation board that demonstrates the ISL8033 dual 3A synchronous buck regulator IC. It provides a fully assembled, tested reference design enabling engineers to validate performance-including efficiency, thermal behavior, load transient response, and power sequencing-before integrating the ISL8033 into their own PCB layouts.

Does the ISL8033DEMO1Z support the ISL8033A variant?

No. The ISL8033DEMO1Z is specifically configured for the ISL8033 (1MHz fixed-frequency version) and uses component values optimized for that variant - including 1.5µH inductors and compensation network per Table 1 of FN6854. It is not validated for the ISL8033A's 2.5MHz operation or its different inductor selection guidelines (Table 2).

Can the output voltages on the ISL8033DEMO1Z be adjusted?

Yes - both outputs are adjustable via external resistor dividers connected to FB1 and FB2. The board ships with 124kΩ/100kΩ dividers set for 1.8V, but users can replace R2/R5 and R3/R6 to achieve other voltages from 0.8V to 3.3V, following the formulas and tables in FN6854 pages 2–3.

What input voltage range is validated for the ISL8033DEMO1Z?

The ISL8033DEMO1Z is validated across the full ISL8033 operating input range of 2.85V to 6V DC, as specified in the Recommended Operating Conditions (page 6, FN6854). This includes single-cell Li+ (2.85–4.2V), three NiMH cells (~3.6–4.5V), and regulated 5V supplies.

How does the ISL8033DEMO1Z handle thermal management?

The ISL8033DEMO1Z replicates the thermal design of the ISL8033 QFN package: the exposed thermal pad is soldered directly to a large PGND copper area and connected via ≥6 thermal vias to internal ground planes. This achieves θJA ≈ 36°C/W (typical), enabling sustained 3A/channel operation without forced airflow per datasheet thermal characterization.