Renesas ISL91302B31-EVZ

Overview

ISL91302B31-EVZ from Renesas Electronics is an evaluation board for the ISL91302B dual-output power management IC, configured specifically for 3+1 phase operation (three-phase Buck #1 + one-phase Buck #2). It supports up to 5A per phase, 2.5V–5.5V input, and programmable 0.3V–2.0V outputs via I²C/SPI, enabling rapid validation of CPU/GPU core power delivery in mobile SoC designs.

For engineers reviewing the ISL91302B31-EVZ datasheet, ISL91302B31-EVZ pinout, ISL91302B31-EVZ application, or ISL91302B31-EVZ equivalent, this board provides pre-layouted WLCSP-54 interface, factory OTP-configured 3+1 topology, integrated telemetry ADC, dynamic voltage scaling control, and full fault protection monitoring - all critical for fast-track PMIC integration in smartphones, tablets, and FPGA power systems.

Technical Context

The ISL91302B31-EVZ implements the ISL91302B IC in a fixed 3+1 output configuration: PH_A/PH_B/PH_D assigned to Buck #1 (VOUT1), PH_C to Buck #2 (VOUT2), with dedicated RTN1/RTN2 remote sensing and independent DVS control per rail. It leverages Renesas' R5 modulator for sub-10µs transient response and seamless CCM/DCM transitions without external compensation.

This evaluation platform exposes all 54-ball WLCSP signals-including PVIN_A/B/C/D, PHx, PGNDx, AVIN, VIO, EN, INT, WDOG_RST, MPIO0–3, GPIO0–1-via test points and edge connectors, supporting real-time telemetry (voltage/current/temperature), programmable 2–6MHz PWM frequency, and configurable I/O pin modes (SPI/I²C/DVS/ADC) per Table 2 of FN8828 Rev.3.01.

Key Specifications

Availability

ISL91302B31-EVZ is available at Aetrix Electronics and suitable for smartphone power validation, tablet SoC bring-up, FPGA core voltage sequencing, and industrial MPU reference design requiring stable component supply and rapid prototyping capability.

Supply support for ISL91302B31-EVZ 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 high-performance analog, mixed-signal, and power management solutions for automotive, industrial, and consumer applications.

The ISL91302B product line delivers highly configurable, multiphase buck PMICs optimized for mobile and portable SoC core power - emphasizing ultra-fast transient response, minimal solution size, and factory-programmable flexibility across 4+0, 3+1, and 2+2 topologies.

FAQ

What is the primary purpose of the ISL91302B31-EVZ evaluation board?

The ISL91302B31-EVZ is a dedicated evaluation platform for the ISL91302B PMIC, pre-configured for 3+1 phase operation (three-phase Buck #1 and one-phase Buck #2). It enables hardware validation of dynamic voltage scaling, telemetry accuracy, load transient response, and power sequencing in mobile and FPGA applications - accelerating design-in without custom PCB development. The ISL91302B31-EVZ includes all necessary decoupling, sense resistors, and interface headers for immediate lab testing.

Does the ISL91302B31-EVZ support both I²C and SPI communication with the host system?

Yes, the ISL91302B31-EVZ supports both I²C and SPI interfaces through its MPIO0–MPIO3 and GPIO0–GPIO1 pins, configurable via OTP-defined pin mode (e.g., Mode 0x0 for dual I²C/SPI, Mode 0x3 for SPI with DVS, Mode 0x5 for full I²C DVS control). The ISL91302B31-EVZ documentation (FN8828 Rev.3.01, Table 2) defines all valid pin mode combinations and corresponding signal assignments for reliable firmware integration.

Can the ISL91302B31-EVZ be used to validate thermal performance under full load?

Yes, the ISL91302B31-EVZ exposes thermal sensor output and supports thermal warning (TALERT = 85°C) and shutdown (TSPS = 140°C) thresholds with ±10% accuracy. It includes thermal vias and copper pours aligned with the ISL91302B WLCSP package footprint, enabling direct junction temperature measurement using IR thermography or thermocouples during 5A-per-phase stress tests - as validated in Figures 19–20 of the ISL91302B31-EVZ datasheet.

How does the ISL91302B31-EVZ implement remote voltage sensing for stability?

The ISL91302B31-EVZ routes RTN1 and RTN2 sense lines directly from the output capacitors back to the ISL91302B's dedicated remote ground pins, minimizing PCB trace impedance errors. This enables ±0.7% system output voltage accuracy across load and temperature - critical for low-voltage SoC cores. The ISL91302B31-EVZ layout follows Renesas' WLCSP PCB recommendations (Section 8.2 of FN8828) to preserve Kelvin sensing integrity.

Is the ISL91302B31-EVZ compatible with other ISL91302B variants like ISL91302B22-EVZ or ISL91302B40-EVZ?

No - the ISL91302B31-EVZ is hardware-specific to the 3+1 output configuration and cannot be reconfigured to emulate 2+2 or 4+0 topologies without modifying the board's power stage routing and feedback network. Each EVZ variant (ISL91302B22-EVZ, ISL91302B31-EVZ, ISL91302B40-EVZ) has unique component placement and net connectivity matching its designated phase assignment, as defined in Table 1 and Figure 3 of the ISL91302B31-EVZ datasheet.