Renesas ISL6420AEVAL1Z

Overview

ISL6420AEVAL1Z from Intersil is an evaluation board for the ISL6420A advanced single synchronous buck PWM controller, designed to drive N-channel MOSFETs in high-efficiency DC/DC converters. It supports input ranges of 4.5V–5.5V and 5.5V–28V, delivers precise 0.6V reference regulation (±1.0%), enables programmable switching frequency from 100kHz to 1.4MHz, and implements lossless overcurrent protection using upper MOSFET r_DS(ON). It is used for validating power supplies in microprocessor, DDR termination, and networking DC/DC applications.

For engineers reviewing the ISL6420AEVAL1Z datasheet, ISL6420AEVAL1Z pinout, ISL6420AEVAL1Z application, or ISL6420AEVAL1Z equivalent, this board provides a fully assembled, tested platform to evaluate voltage-mode control, external reference tracking, voltage margining, PGOOD sequencing, and hiccup-mode fault response - all critical for embedded power system validation and layout verification.

Technical Context

The ISL6420AEVAL1Z implements the ISL6420A's full functional architecture: voltage-mode PWM control with 15MHz gain-bandwidth error amplifier and 6V/µs slew rate; dual-input operation (5V ±10% or 5.5V–28V); and integrated gate drivers delivering 0.7A peak current with 20ns rise/fall times and 20ns dead time. It validates the IC's lossless overcurrent sensing via PHASE node monitoring and OCSET pin configuration.

This board demonstrates three key operating modes: internal 0.6V reference regulation, external reference tracking (e.g., 1.25V DDR VTT), and resistor-programmable voltage margining (±10%). It supports PGOOD delay programming via CDEL capacitor (e.g., 125ms with 0.1µF) and soft-start control via ENSS pin with 10µA current source.

Key Specifications

Availability

ISL6420AEVAL1Z is available at Aetrix Electronics and suitable for power supply validation, DDR termination supply qualification, and networking DC/DC converter development requiring stable component supply and documented reference design implementation.

Supply support for ISL6420AEVAL1Z 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 high-performance analog and power management ICs for computing, communications, and industrial systems.

The ISL6420A product line was engineered to simplify high-efficiency synchronous buck converter design for microprocessor core, DDR bus termination, and distributed power architectures - with emphasis on integration, transient response, and system-level protection.

FAQ

What is the primary function of the ISL6420AEVAL1Z evaluation board?

The ISL6420AEVAL1Z is a fully assembled evaluation platform for the ISL6420A synchronous buck PWM controller. It enables engineers to validate the IC's voltage-mode control loop, soft-start behavior, PGOOD sequencing, external reference tracking, voltage margining, and lossless overcurrent protection using real-world components and test conditions - without requiring custom PCB design.

Does the ISL6420AEVAL1Z support both QFN and QSOP packages of the ISL6420A?

Yes, the ISL6420AEVAL1Z board layout accommodates both the 20-lead QFN (4×4 mm) and 20-lead QSOP packages of the ISL6420A, as confirmed by the device's dual-package ordering information and evaluation board documentation. Users must select the appropriate footprint during assembly per their target ISL6420A variant.

Can the ISL6420AEVAL1Z be used to test DDR SDRAM termination supplies?

Yes, the ISL6420AEVAL1Z supports DDR termination supply validation via the ISL6420A's external reference tracking mode. When configured with GPIO1/REFIN tied to 1.25V and VMSET/MODE pulled high, the board delivers a buffered 1.25V REFOUT signal and regulates VOUT to match - enabling direct testing of VTT supply performance per JEDEC DDR specifications.

How is voltage margining implemented and verified on the ISL6420AEVAL1Z?

Voltage margining on the ISL6420AEVAL1Z is implemented by connecting a resistor (150kΩ–400kΩ) from VMSET/MODE to ground and toggling GPIO1/GPIO2 per Table 3. The board validates ±10% output adjustment (e.g., ±330mV on 3.3V rail) with controlled slew rates (2.5ms typical for 0.1µF CDEL), as specified in ISL6420A datasheet pages 12–14.

Is the ISL6420AEVAL1Z recommended for new designs given the ISL6420A's status?

No - the ISL6420A is marked "NOT RECOMMENDED FOR NEW DESIGNS" with ISL6420B listed as the recommended replacement. The ISL6420AEVAL1Z remains available for legacy validation, failure analysis, and backward-compatible system maintenance, but new designs should use evaluation platforms aligned with the ISL6420B or newer Renesas buck controller families.