Renesas ISL91211AII-EV1Z

Overview

ISL91211AII-EV1Z from Renesas is an evaluation board designed to validate the ISL91211A triple-output, 4-phase programmable PMIC in real-world power delivery applications. It supports configurable 2+1+1 phase operation, delivers up to 10A on VOUT1 and 5A per remaining output, features SPI/I²C programmability, ±0.7% system accuracy with remote sensing, and operates from 2.5V–5.5V input for smartphone and AI processor power rails.

For engineers reviewing the ISL91211AII-EV1Z datasheet, ISL91211AII-EV1Z pinout, ISL91211AII-EV1Z application, or ISL91211AII-EV1Z equivalent, this board enables rapid characterization of dynamic voltage scaling (3mV/µs), fast load transient response (50A/µs per phase), multiphase efficiency optimization, and fault protection behavior-including UV/OV/OC/OT detection-under actual PCB layout and thermal conditions.

Technical Context

The ISL91211AII-EV1Z implements a hardware reference design for the ISL91211A PMIC using Renesas' proprietary R5 control architecture, enabling ultra-fast transient response without external compensation and seamless DCM/CCM transitions. It integrates four synchronous buck controllers with low-R_DS(ON) MOSFETs (23mΩ HS / 9mΩ LS) and supports reconfigurable power stage assignment across three outputs.

This evaluation platform exposes all 54-ball WLCSP signals-including PVIN_A/B/C/D, PH_A/B/C/D, RTN1–RTN3, MPIO0–3, GPIO0–2, INT, WDOG_RST, and I²C/SPI pins-enabling full validation of programmable PWM frequency (2–6MHz), independent DVS per output, soft-start sequencing, and protection features like overtemperature shutdown (143–162°C) and current limiting.

Key Specifications

Availability

ISL91211AII-EV1Z is available at Aetrix Electronics and suitable for smartphone power subsystem validation, AI processor core rail testing, AR/VR glasses power architecture prototyping, and optical transceiver module development requiring stable component supply and full-feature evaluation access.

Supply support for ISL91211AII-EV1Z 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 specializing in microcontrollers, analog power management, and embedded solutions for automotive, industrial, and consumer markets.

The ISL91211AII-EV1Z belongs to Renesas' high-density PMIC product line, engineered specifically for space-constrained, high-efficiency mobile and edge AI platforms demanding multi-rail programmability, fast transient response, and minimal external component count.

FAQ

What is the primary function of the ISL91211AII-EV1Z evaluation board?

The ISL91211AII-EV1Z evaluation board is a fully assembled and tested hardware platform designed to accelerate development and validation of the ISL91211A triple-output, 4-phase PMIC. It provides accessible test points, jumpers for configuration, and pre-routed layout matching Renesas' recommended guidelines-enabling immediate evaluation of dynamic voltage scaling, multiphase efficiency, transient response, and fault handling without custom PCB design. The ISL91211AII-EV1Z directly interfaces with standard lab equipment and host controllers via its exposed I²C/SPI headers.

Does the ISL91211AII-EV1Z support both ISL91211A and ISL91211B devices?

No-the ISL91211AII-EV1Z is specifically configured for the ISL91211A triple-output variant (2+1+1 phase configuration). Its schematic, layout, and default firmware are optimized for VOUT1–VOUT3 operation, with VOUT4/RTN4 shorted to ground as specified in the ISL91211A datasheet. For the quad-output ISL91211B (1+1+1+1), Renesas provides the separate ISL91211BII-EV1Z evaluation board. Using the ISL91211AII-EV1Z with an ISL91211B IC may result in incorrect biasing or missing functionality.

What power supply requirements must be met to operate the ISL91211AII-EV1Z?

The ISL91211AII-EV1Z requires two independent DC supplies: one for the analog/digital core (AVIN, 2.5V–5.5V) and one per power stage (PVIN_A/B/C/D, also 2.5V–5.5V). All PVIN rails must be externally supplied and synchronized during startup. The board includes onboard LDOs for VIO (1.8V) and AVIN_FILT (2.5V–5.5V filtered analog supply), but these depend on correct external PVIN/AVIN sequencing. Input decoupling capacitors are pre-installed per Renesas' layout recommendations.

How is dynamic voltage scaling (DVS) implemented and verified on the ISL91211AII-EV1Z?

DVS on the ISL91211AII-EV1Z is implemented via I²C or SPI register writes to the BUCKx_VOUT registers, with programmable slew rates up to 3mV/µs. The board exposes dedicated test points for VOUT1–VOUT3 and corresponding RTN sense lines, allowing oscilloscope-based measurement of DVS transition time, overshoot, and settling behavior under load. Real-time telemetry-including output voltage, current, temperature, and fault status-is accessible through the ISL91211A's integrated ADC and status registers, readable via the evaluation software.

Can the ISL91211AII-EV1Z be used for production-level thermal validation?

Yes-the ISL91211AII-EV1Z incorporates thermal vias, copper pour, and footprint alignment matching the ISL91211A's 2.551mm × 3.67mm 54-ball WLCSP package, enabling representative junction-to-ambient thermal resistance (θ_JA = 42°C/W typical). Onboard temperature sensors and the ISL91211A's internal die temperature monitor (143–162°C shutdown threshold) allow correlation between ambient, case, and junction temperatures under sustained 10A loads. However, final thermal design validation should occur on the target end-product PCB.