Renesas ISL91211BII-EV1Z

Overview

ISL91211BII-EV1Z from Renesas is an evaluation board designed to validate the ISL91211B quad-output, 4-phase programmable PMIC - supporting up to 5A per phase, I²C/SPI configuration, and dynamic voltage scaling (DVS) for AI processors, optical transceivers, and high-density SSDs. It implements a 1+1+1+1 phase configuration with remote sensing, ±0.7% output accuracy, and R5 control architecture.

For engineers reviewing the ISL91211BII-EV1Z datasheet, ISL91211BII-EV1Z pinout, ISL91211BII-EV1Z application, or ISL91211BII-EV1Z equivalent, this board enables rapid characterization of buck transient response (50A/µs), efficiency optimization (94.7% at 3.8V_IN/1.8V_OUT), and multi-rail sequencing in space-constrained mobile and edge-AI platforms.

Technical Context

The ISL91211BII-EV1Z provides full hardware access to all 54-ball WLCSP signals of the ISL91211B PMIC, including four PH_x switching nodes, four RTN sense inputs, MPIO/GPIO configurable for I²C/SPI/DVS/PGOOD, and dedicated EN, WDOG_RST, and INT lines. It supports both forced CCM and diode-emulation DCM operation across 2–6MHz programmable switching frequency.

Board-level design incorporates optimized power delivery: low-ESR ceramic output capacitors, 220nH/560nH inductor options, AVIN_FILT filtering, and thermal vias aligned to the PMIC's 2.551mm × 3.67mm die. Layout follows Renesas' WLCSP PCB recommendations (TB379, TB493) for signal integrity and thermal performance under 125°C junction conditions.

Key Specifications

Availability

ISL91211BII-EV1Z is available at Aetrix Electronics and suitable for AI accelerator development, optical transceiver module validation, and enterprise SSD power architecture prototyping requiring stable component supply and fast-turn evaluation support.

Supply support for ISL91211BII-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 delivering microcontrollers, analog power, and SoC solutions for automotive, industrial, infrastructure, and IoT applications.

The ISL91211BII-EV1Z belongs to Renesas' high-efficiency PMIC product line, engineered specifically for battery-powered and thermally constrained edge-AI, AR/VR, and high-speed data storage systems demanding ultra-fast transient response and minimal solution size.

FAQ

What is the primary purpose of the ISL91211BII-EV1Z evaluation board?

The ISL91211BII-EV1Z evaluation board is designed exclusively to prototype, validate, and characterize the ISL91211B quad-output PMIC in real-world power delivery scenarios. It provides full access to all 54 WLCSP pins, pre-populated with optimized passive components (inductors, capacitors, filters), and supports both I²C and SPI configuration of output voltages, DVS timing, and fault thresholds - enabling rapid bring-up for AI processors and optical modules.

Does the ISL91211BII-EV1Z support all ISL91211B pin configurations and interface modes?

Yes, the ISL91211BII-EV1Z fully exposes all ISL91211B pins - including PH_A through PH_D, RTN1–RTN4, MPIO0–MPIO3, GPIO0–GPIO2, EN, WDOG_RST, and INT - allowing hardware verification of every pinmode (0x0–0xC) defined in the ISL91211B datasheet. Jumpers and test points enable flexible routing for I²C clock/data, SPI signals, DVS inputs, or PGOOD outputs without solder modification.

Can the ISL91211BII-EV1Z be used to evaluate multi-phase transient response and efficiency?

Yes, the ISL91211BII-EV1Z is configured to measure true multi-phase transient behavior: it supports simultaneous 50A/µs load steps across two phases (validated per Figure 17 of FN8922), and includes calibrated current-sense resistors and probe points for oscilloscope-based ripple, efficiency (94.7% at 3.8V_IN/1.8V_OUT), and startup/shutdown timing analysis per Figures 23–26.

What documentation accompanies the ISL91211BII-EV1Z evaluation board?

The ISL91211BII-EV1Z ships with UG116 ("ISL91211BII-EV1Z Evaluation Board User Guide"), which details board layout, jumper settings, test point functions, schematic diagrams, bill of materials, and step-by-step procedures for configuring the ISL91211B via I²C/SPI. It cross-references the main ISL91211A/B datasheet (FN8922 Rev.3.01) for register-level control and protection feature validation.

Is the ISL91211BII-EV1Z compatible with the ISL91211A PMIC?

No - the ISL91211BII-EV1Z is specifically laid out for the ISL91211B quad-output variant (1+1+1+1 phase, VOUT4/RTN4 active). While physically identical in package (54-ball WLCSP), the ISL91211A uses VOUT4/RTN4 shorted to ground and supports only triple output (2+1+1 phase); attempting to use ISL91211A on this board would disable Buck4 functionality and require firmware and layout adjustments not supported by UG116.