Renesas ISL85005ADEMO1Z

Overview

ISL85005ADEMO1Z from Renesas Electronics is a demonstration board for the ISL85005A 4.5V–18V input, 5A synchronous buck regulator IC. It implements a complete 5A DC/DC step-down converter with internal high- and low-side MOSFETs, fixed 500kHz switching frequency, programmable soft-start, and forced CCM operation-designed for evaluation of point-of-load power delivery in embedded computing and network equipment.

For engineers reviewing the ISL85005ADEMO1Z datasheet, ISL85005ADEMO1Z layout, ISL85005ADEMO1Z test setup, or ISL85005ADEMO1Z design integration, this page provides verified functional context, supply chain support details, and manufacturer-specific application guidance for rapid prototyping and performance validation.

Technical Context

The ISL85005ADEMO1Z board implements the ISL85005A IC in a fixed-frequency (500kHz), forced Continuous Conduction Mode (FCCM) configuration with internal compensation and programmable soft-start via an external capacitor on the SS pin. It supports input voltages from 4.5V to 18V and delivers up to 5A at user-configurable output voltages down to 0.8V using the FB resistor divider.

Key design features include integrated bootstrap diode, Power-Good (PG) open-drain indicator, comprehensive protection (input UVLO, output overvoltage, thermal shutdown, cycle-by-cycle current limit), and a compact 3mm × 4mm 12-pin DFN package with exposed thermal pad. The demo board uses standard external components (e.g., 3.3µH inductor, 47µF output capacitors) aligned with Renesas' recommended typical application schematic.

Key Specifications

Availability

ISL85005ADEMO1Z is available at Aetrix Electronics and suitable for embedded computing, network infrastructure, and industrial point-of-load power design requiring stable component supply, fast evaluation turnaround, and validated reference schematics.

Supply support for ISL85005ADEMO1Z 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 is a global semiconductor leader delivering microcontrollers, analog power, and SoC solutions for automotive, industrial, and enterprise applications with emphasis on reliability and system-level integration.

The ISL85005A belongs to Renesas' high-efficiency monolithic buck regulator product line, engineered for space-constrained, thermally demanding point-of-load applications where integrated FETs, robust protection, and predictable FCCM behavior simplify power system design.

FAQ

What is the primary function of the ISL85005ADEMO1Z?

The ISL85005ADEMO1Z is a fully assembled demonstration board that implements the ISL85005A 5A synchronous buck regulator IC. It enables immediate evaluation of voltage conversion performance, thermal behavior, transient response, and protection features without custom PCB design. Engineers use ISL85005ADEMO1Z to validate ISL85005A operation under real load conditions before integrating it into end systems.

Does the ISL85005ADEMO1Z support both ISL85005 and ISL85005A ICs?

No - the ISL85005ADEMO1Z is specifically configured for the ISL85005A variant. It leverages the ISL85005A's programmable soft-start (SS pin) and forced CCM-only operation. The ISL85005 (with SYNC/MODE pin and Diode Emulation Mode capability) requires different pin strapping and control logic, so ISL85005ADEMO1Z is not compatible with the ISL85005 IC.

What output voltages can be achieved using the ISL85005ADEMO1Z?

The ISL85005ADEMO1Z supports output voltages from 0.8V up to just below the input voltage (minus conduction losses), set by the FB resistor divider. Typical configurations include 1.2V, 1.8V, 2.5V, 3.3V, and 5V - as validated in Table 2 of the FN8871 datasheet. The board includes solder jumpers and test points to facilitate quick reconfiguration of the feedback network for different VOUT targets.

How is soft-start configured on the ISL85005ADEMO1Z?

The ISL85005ADEMO1Z implements the ISL85005A's programmable soft-start via an external capacitor connected to the SS pin. By default, with no capacitor installed, the soft-start time is 2.3ms. Adding a capacitor (e.g., 100nF) extends the ramp time linearly with capacitance value, allowing controlled inrush current limiting during startup - a key requirement for systems powering sensitive downstream circuitry.

What protections are demonstrated on the ISL85005ADEMO1Z?

The ISL85005ADEMO1Z demonstrates all core protections of the ISL85005A IC: input undervoltage lockout (UVLO triggers at ~4.2V), output overvoltage protection (OVP threshold ~115% of regulation), thermal shutdown (165°C junction), high-side cycle-by-cycle current limit (~7.8A), and low-side reverse current limit (−3.3A). These are observable via PG pin behavior, shutdown recovery timing, and oscilloscope waveforms during fault injection tests.