Renesas ISL8502EVAL1Z

Overview

ISL8502EVAL1Z from Intersil (now Renesas) is an evaluation board for the ISL8502 2A synchronous buck regulator IC with integrated MOSFETs in a 4mm×4mm QFN-24 package. It supports input voltages from 5.5V to 14V, delivers adjustable output down to 0.6V with ±1% regulation accuracy, and enables master/slave synchronization for multi-rail power systems - used in GPU and ASIC point-of-load applications.

For engineers reviewing the ISL8502EVAL1Z datasheet, ISL8502EVAL1Z pinout, ISL8502EVAL1Z application, or ISL8502EVAL1Z equivalent, this board provides validated reference design, thermal performance data, soft-start tuning, PGOOD monitoring, and synchronized multi-channel operation verification for industrial and embedded power supply development.

Technical Context

The ISL8502EVAL1Z implements a voltage-mode PWM synchronous buck topology using the ISL8502 controller IC, which integrates dual N-channel MOSFETs and features adaptive shoot-through protection. It supports programmable switching frequency (500kHz–1.2MHz) via external RT resistor and delivers up to 2A continuous output with fast transient response.

It enables both standalone single-output and master/slave multi-output configurations - with one master driving up to six synchronized slave channels via the SYNCH pin - reducing EMI through clock alignment and minimizing beat frequencies in dense PCB layouts.

Key Specifications

Availability

ISL8502EVAL1Z is available at Aetrix Electronics and suitable for point-of-load power design, GPU/ASIC supply validation, and multi-rail embedded system development requiring stable component supply and rapid prototyping capability.

Supply support for ISL8502EVAL1Z 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 manufacturer specializing in analog, power, and embedded processing solutions for industrial, automotive, and communications markets.

The ISL8502EVAL1Z belongs to Renesas' high-efficiency DC/DC evaluation platform family, designed to accelerate adoption of integrated synchronous buck regulators in space-constrained, thermally demanding point-of-load applications.

FAQ

What is the primary function of the ISL8502EVAL1Z evaluation board?

The ISL8502EVAL1Z evaluation board is a fully assembled and tested reference design for the ISL8502 2A synchronous buck regulator IC. It allows engineers to validate performance parameters including efficiency, transient response, thermal behavior, PGOOD timing, and master/slave synchronization - without designing a custom PCB. The board uses the exact ISL8502IRZ IC in its native 4×4 mm QFN package and follows layout guidelines from FN6389 Rev 2.00.

Does the ISL8502EVAL1Z support adjustable switching frequency, and how is it configured?

Yes, the ISL8502EVAL1Z supports adjustable switching frequency from 500kHz to 1.2MHz via the FS pin on the ISL8502IC. Frequency is set by an external resistor (RT) connected from FS to PGND - e.g., 96kΩ yields ~500kHz, 40kΩ yields ~1.2MHz. The board includes footprint options for RT placement and supports fixed 800kHz operation when FS is tied to PVCC. This flexibility enables optimization of size, efficiency, and EMI in final designs.

Can the ISL8502EVAL1Z be used to evaluate multi-rail synchronized power supplies?

Yes, the ISL8502EVAL1Z is explicitly designed to demonstrate master/slave operation. When configured as master (M/S tied to PVCC), its SYNCH pin outputs a clock signal that can synchronize up to six ISL8502-based slave boards - eliminating beat frequencies and reducing conducted/radiated EMI in multi-output systems. The board includes test points and jumpers to configure M/S and SYNCH modes per FN6389 Section "Multi-Channel (Master/Slave) Operation".

What protection features are validated on the ISL8502EVAL1Z board?

The ISL8502EVAL1Z validates all key protections of the ISL8502IC: lossless rDS(ON)-based overcurrent detection (positive/negative), undervoltage lockout (UVLO at 76–84% of VREF), thermal shutdown (150°C trip, 130°C recovery), and hiccup-mode fault recovery. These are confirmed via oscilloscope measurements of PGOOD, EN pin behavior, and load-step stress tests documented in FN6389 Figures 28–32 - enabling reliable fault characterization before production design.

Is the ISL8502EVAL1Z compatible with pre-biased output startup?

Yes, the ISL8502EVAL1Z demonstrates start-up with pre-biased output - a critical feature for hot-swap and rail-sequencing applications. Figure 26 in FN6389 Rev 2.00 shows clean startup into a 2V pre-biased rail without reverse current or output overshoot. This behavior is enabled by the ISL8502's internal control logic and verified on the evaluation board using standard lab equipment, confirming robustness in complex power sequencing environments.