Renesas ISL6522BEVAL1

Overview

ISL6522BEVAL1 from Intersil is an evaluation board for the ISL6522B synchronous buck PWM controller IC, designed to drive two N-channel MOSFETs in high-performance microprocessor power supplies. It supports 0.8V output regulation with ±1% tolerance, 50kHz–1MHz programmable switching frequency, and r_DS(ON)-based overcurrent protection without external sense resistors.

For engineers reviewing the ISL6522BEVAL1 datasheet, ISL6522BEVAL1 pinout, ISL6522BEVAL1 application, or ISL6522BEVAL1 equivalent, this board enables rapid validation of voltage-mode control loop stability, pre-biased load startup behavior, soft-start timing, and hiccup-mode fault response in Pentium®/PowerPC®-class DC-DC designs.

Technical Context

The ISL6522BEVAL1 implements a complete synchronous buck converter reference design using the ISL6522B controller, which integrates voltage-mode PWM control, 15MHz GBW error amplifier, adaptive shoot-through protection, and dual gate drivers (UGATE/LGATE) with 500mA/450mA peak sourcing capability. It supports both +5V and +12V bias inputs and operates across –40°C to +85°C ambient.

Board-level features include RT-resistor programmable oscillator, OCSET-based current sensing via upper MOSFET r_DS(ON), SS capacitor-controlled soft-start, and PVCC/VCC decoupling optimized for low-noise gate drive. The layout follows critical high-frequency routing guidelines: short PHASE/BOOT/LGATE traces, localized CSS/CBOOT placement, and ground-plane construction per Intersil FN9150 layout recommendations.

Key Specifications

Availability

ISL6522BEVAL1 is available at Aetrix Electronics and suitable for FPGA core DC/DC validation, Pentium®/PowerPC® power supply development, and low-voltage distributed power system prototyping requiring stable component supply and full functional verification support.

Supply support for ISL6522BEVAL1 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 (now part of Renesas Electronics) is a semiconductor company specializing in precision analog, power management, and interface ICs for computing, industrial, and communications systems.

The ISL6522B product line was engineered specifically for high-efficiency, high-transient-response core power supplies targeting Intel Pentium®, Pentium Pro®, PowerPC®, and AlphaPC™ microprocessors - emphasizing tight voltage regulation, fast soft-start, and MOSFET-loss-aware protection.

FAQ

What is the primary function of the ISL6522BEVAL1 evaluation board?

The ISL6522BEVAL1 evaluation board is a fully assembled reference design that demonstrates the ISL6522B synchronous buck PWM controller in operation. It enables engineers to validate key performance characteristics including 0.8V output regulation accuracy, 50kHz–1MHz frequency programming, r_DS(ON)-based overcurrent trip behavior, and pre-biased load startup - all using the exact ISL6522B IC deployed in production systems.

Does the ISL6522BEVAL1 support both SOIC and QFN versions of the ISL6522B controller?

No - the ISL6522BEVAL1 is configured for the 16-lead 5×5mm QFN package variant of the ISL6522B (ISL6522BIRZ), as confirmed by the board's footprint, thermal pad layout, and component placement matching Intersil's L16.5x5B package drawing. It does not accommodate the 14-lead SOIC version (ISL6522BIBZ).

Can the ISL6522BEVAL1 be used to evaluate pre-biased output startup?

Yes - the ISL6522BEVAL1 implements the ISL6522B's native pre-biased load startup capability. During soft-start, the lower MOSFET remains disabled while the upper MOSFET body diode conducts, allowing the output to rise from a non-zero initial voltage. Once regulation is achieved, synchronous rectification resumes - a behavior verified on the ISL6522BEVAL1 per FN9150 Section 7.

What input voltage ranges are supported by the ISL6522BEVAL1?

The ISL6522BEVAL1 supports +5V or +12V input bias per the ISL6522B's specified operating conditions. The board includes dedicated PVCC and VCC rails, enabling independent optimization of lower gate drive (PVCC) and controller logic (VCC). Input voltage must remain within ±10% of nominal to ensure proper POR and gate driver operation.

How is overcurrent protection implemented on the ISL6522BEVAL1?

Overcurrent protection on the ISL6522BEVAL1 uses the ISL6522B's built-in r_DS(ON) sensing architecture: an internal 200μA current source (IOCSET) develops a voltage across ROCSET, which is compared to the voltage drop across the upper MOSFET's channel. When exceeded, the ISL6522B enters hiccup mode - discharging the SS capacitor and inhibiting PWM - eliminating the need for external current-sense resistors.