Renesas ISL80031DEMO1Z

Overview

ISL80031DEMO1Z from Intersil is a 3A, PFM-mode, 1MHz demonstration board for the ISL80031 synchronous step-down DC/DC converter, configured for 1.8V output from 2.7V–5.5V input, delivering up to 95% peak efficiency in a compact layout optimized for point-of-load applications.

For engineers reviewing the ISL80031DEMO1Z datasheet, ISL80031DEMO1Z pinout, ISL80031DEMO1Z application, or ISL80031DEMO1Z equivalent, this board enables rapid evaluation of PFM efficiency, thermal behavior, transient response, and protection features under real load conditions without custom PCB design.

Technical Context

The ISL80031DEMO1Z implements a monolithic synchronous buck topology using peak current mode control, supporting PFM operation for high light-load efficiency. It integrates the ISL80031 IC in an 8-lead 2mm×2mm DFN package with exposed thermal pad, and uses a 1.0µH power inductor and 22µF ceramic output capacitors.

Designed for fixed 1.8V output, the board includes EN, PG, PHASE, FB, VIN, PGND, and VOUT test points, with built-in negative current protection, internal soft-start/soft-stop, overcurrent, short-circuit, and over-temperature safeguards - all verified per UG047 Rev.2.00 functional test procedures.

Key Specifications

Availability

ISL80031DEMO1Z is available at Aetrix Electronics and suitable for point-of-load power evaluation, DC/DC converter validation, and embedded power architecture prototyping requiring stable component supply and documented reference performance.

Supply support for ISL80031DEMO1Z 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 systems.

The ISL8003x product line delivers ultra-low-quiescent-current, monolithic synchronous buck regulators targeting space- and efficiency-critical point-of-load applications in portable and embedded electronics.

FAQ

What is the primary function of the ISL80031DEMO1Z?

The ISL80031DEMO1Z is a fully assembled demonstration board designed to evaluate the ISL80031 3A PFM-mode synchronous buck regulator. It provides immediate access to key signals (EN, PG, PHASE, FB), pre-tuned 1.8V output, and validated thermal/mechanical layout - enabling engineers to verify efficiency, transient response, and protection behavior without designing a custom PCB. The ISL80031DEMO1Z directly implements the ISL80031FRZ IC in its intended operating configuration.

Does the ISL80031DEMO1Z support adjustable output voltage?

No, the ISL80031DEMO1Z is factory-configured for a fixed 1.8V output using a precision resistor divider on the FB pin. It does not include external VOUT adjustment components or jumpers. To evaluate other output voltages, users must modify the feedback network per the ISL80031 datasheet - but such changes void the board's validated performance claims and require re-characterization. The ISL80031DEMO1Z is intended for 1.8V PoL use cases only.

What input voltage range is supported by the ISL80031DEMO1Z?

The ISL80031DEMO1Z supports an input voltage range of 2.7V to 5.5V, as specified in UG047 Rev.2.00. This range accommodates common sources including single-cell Li-ion batteries (2.7–4.2V), USB 5V supplies, and regulated 3.3V or 5V system rails. Operation outside this range may damage the ISL80031 IC or compromise regulation stability, and is not validated for the ISL80031DEMO1Z board.

How is thermal performance managed on the ISL80031DEMO1Z?

Thermal performance on the ISL80031DEMO1Z relies on the ISL80031's exposed thermal pad soldered to a dedicated copper pour on the PCB's bottom layer, connected via ≥4 thermal vias. Layout guidelines in UG047 emphasize maximizing copper area under the IC and maintaining a solid ground plane. Measured thermal rise remains within safe limits up to 3A load at +25°C ambient, consistent with the ISL80031DEMO1Z's 95% peak efficiency and integrated over-temperature protection.

Can the ISL80031DEMO1Z be used to evaluate both PWM and PFM modes?

No - the ISL80031DEMO1Z is specifically configured for PFM-mode operation, matching the ISL80031 (not ISL80030). While the underlying ISL80031 IC supports automatic PFM/PWM transition, the board's component selection (e.g., inductor, compensation) and test conditions in UG047 focus on PFM characterization (e.g., Figure 17 shows "PFM" label). For PWM-only evaluation, the ISL80030DEMO1Z board is required. The ISL80031DEMO1Z does not enable forced-PWM mode via external control.