Renesas ISL6420BEVAL1Z

Overview

ISL6420BEVAL1Z from Renesas Electronics (formerly Intersil) is an evaluation board for the ISL6420B advanced single synchronous buck PWM controller, designed to drive N-channel MOSFETs in high-efficiency DC/DC converters. It supports input ranges of 4.5–5.5V and 5.5–28V, delivers precise 0.6V internal reference (±2%), enables programmable switching frequency from 100kHz to 1.4MHz, and implements lossless overcurrent protection via upper MOSFET r_DS(ON) sensing - validated in DDR termination and microprocessor core supply applications.

For engineers reviewing the ISL6420BEVAL1Z datasheet, ISL6420BEVAL1Z pinout, ISL6420BEVAL1Z application, or ISL6420BEVAL1Z equivalent, this board provides a fully assembled, tested platform to validate voltage-mode control loop stability, PGOOD sequencing, voltage margining (±10%), external reference tracking, and hiccup-mode fault response under real load transients and pre-biased startup conditions.

Technical Context

The ISL6420BEVAL1Z implements the ISL6420B controller in a 20-lead QFN (4×4 mm) package with integrated gate drivers capable of 0.7A peak current, 20ns rise/fall times, and 20ns dead time. It leverages the IC's 15MHz gain-bandwidth error amplifier and 6V/µs slew rate to achieve fast transient response across output loads up to 10A.

This evaluation board supports dual-input configurations: 5V ±10% (bypassing internal LDO) and 5.5–28V (enabling internal 5V VCC5 regulator), and includes configurable jumpers for GPIO1/REFIN, GPIO2, VMSET/MODE, and CDEL to demonstrate voltage margining, external reference tracking, and PGOOD delay tuning per ISL6420B datasheet Figures 11–13.

Key Specifications

Availability

ISL6420BEVAL1Z is available at Aetrix Electronics and suitable for DDR SDRAM bus termination, microprocessor core supply validation, networking DC/DC converter development, and externally referenced buck converter prototyping requiring stable component supply and full functional verification.

Supply support for ISL6420BEVAL1Z 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 acquired Intersil in 2017 and maintains full technical documentation, errata, and long-term support for legacy Intersil power management ICs including the ISL6420B family.

The ISL6420B product line was engineered specifically for high-performance, space-constrained DC/DC regulation in computing and communications infrastructure - emphasizing fast transient response, lossless current sensing, and flexible reference architecture for DDR and ASIC core supplies.

FAQ

What is the primary function of the ISL6420BEVAL1Z evaluation board?

The ISL6420BEVAL1Z is a fully assembled hardware platform designed to demonstrate and validate the ISL6420B synchronous buck PWM controller. It enables engineers to verify voltage-mode control loop behavior, soft-start timing, PGOOD sequencing, voltage margining (±10%), external reference tracking, and hiccup-mode fault recovery - all per the ISL6420B datasheet FN6901 Rev 1.00 specifications.

Does the ISL6420BEVAL1Z support both 5V and wide-input operation?

Yes, the ISL6420BEVAL1Z supports two input configurations as defined in FN6901 Table 1: 5V ±10% (with VIN tied to VCC5 to bypass the internal LDO) and 5.5–28V (with VIN powered directly and VCC5 generated internally). Jumper settings on the board allow quick reconfiguration between these modes without soldering changes.

How is overcurrent protection implemented on the ISL6420BEVAL1Z?

The ISL6420BEVAL1Z implements lossless overcurrent protection using the ISL6420B's built-in r_DS(ON)-based sensing - no external current-sense resistor required. The OCSET pin connects to the upper MOSFET drain via a resistor; a 100µA internal current source sets the trip threshold. When PHASE voltage drops below OCSET during upper-FET conduction, the controller enters hiccup mode after 8 consecutive cycles.

Can the ISL6420BEVAL1Z be used for DDR termination supply validation?

Yes, the ISL6420BEVAL1Z is explicitly configured per FN6901 Pages 5 and 15 for DDR termination applications. It supports external reference tracking (GPIO1/REFIN = VDDQ/2), buffered REFOUT output (1.25V ±1%), and voltage margining - enabling precise validation of VTT supply accuracy, sequencing, and margin testing per JEDEC DDR standards.

What are the key jumpers and test points on the ISL6420BEVAL1Z used for?

The ISL6420BEVAL1Z includes dedicated jumpers for VMSET/MODE (voltage margining enable), GPIO1/REFIN and GPIO2 (margining polarity control), CDEL (PGOOD delay timing), and RT (frequency selection). Test points provide direct access to VIN, VOUT, PHASE, BOOT, UGATE, LGATE, FB, COMP, PGOOD, and ENSS - allowing oscilloscope probing of critical waveforms and loop stability analysis.