Renesas ISL91212AEVAL1Z

Overview

ISL91212AEVAL1Z from Renesas is an evaluation board for the ISL91212A triple-output, four-phase programmable PMIC. It supports 2+1+1 phase configuration delivering up to 10A on VOUT1 and 5A each on VOUT2/VOUT3, operates from 2.5V–5.5V input, features I²C programmability (0.3V–2.0V output range), ±0.7% system accuracy with remote sensing, and integrates R5 Technology for ultra-fast transient response (50A/µs per phase). It is designed for power validation in smartphone and AI processor reference designs.

For engineers reviewing the ISL91212AEVAL1Z datasheet, ISL91212AEVAL1Z pinout, ISL91212AEVAL1Z application, or ISL91212AEVAL1Z equivalent, this board enables rapid characterization of dynamic voltage scaling, multiphase buck sequencing, light-load efficiency modes (Diode Emulation/Pulse Skipping), and fault response (OV/UV/OC/OT) under real-world load transients and thermal conditions.

Technical Context

The ISL91212AEVAL1Z implements the full signal and power interface of the ISL91212A PMIC, including all 35-ball WLCSP pins routed to test points, jumpers, and connectors for VIO (1.8V), AVIN (2.5–5.5V), PVIN rails, I²C (SCL/SDA), GPIO/MPIO, interrupt, and remote sense (RTN1–RTN3). It supports configurable DVS pin modes via onboard strapping options per Table 2 of FN8962 Rev.1.00.

Board-level design follows Renesas' layout recommendations for WLCSP packages: optimized high-current PVIN/PGND planes, minimized loop area for PHx nodes, dedicated AGND/PGND separation, and decoupling per phase (2×22µF + 2×4.3µF + 4×1µF on VOUT1; 1×22µF + 4×4.3µF on VOUT2/VOUT3), enabling accurate measurement of 4MHz CCM operation and sub-100ns load-step response.

Key Specifications

Availability

ISL91212AEVAL1Z is available at Aetrix Electronics and suitable for smartphone power architecture validation, AI processor SoC bring-up, AR/VR glasses subsystem testing, and optical transceiver module development requiring stable component supply and fast-turn evaluation support.

Supply support for ISL91212AEVAL1Z 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 applications.

The ISL91212A belongs to Renesas' high-density PMIC product line targeting mobile and edge AI platforms, engineered to deliver multi-rail, high-efficiency power with minimal PCB area and robust transient immunity.

FAQ

What is the primary function of the ISL91212AEVAL1Z evaluation board?

The ISL91212AEVAL1Z evaluation board is a fully assembled and tested platform for validating the ISL91212A triple-output, four-phase PMIC. It provides access to all critical signals-including PVIN, PHx nodes, RTN sense lines, I²C bus, GPIO/MPIO, and interrupt-enabling engineers to characterize dynamic voltage scaling, multiphase current sharing, startup/shutdown sequencing, and protection behavior without custom PCB design.

Does the ISL91212AEVAL1Z support both ISL91212A and ISL91212B configurations?

No. The ISL91212AEVAL1Z is specifically configured for the ISL91212A triple-output (2+1+1 phase) variant. Its layout, jumper settings, and default firmware match the ISL91212A pinout and phase mapping (e.g., PH_D/PH_C for VOUT1 dual-phase, PH_B for VOUT2, PH_A for VOUT3). The ISL91212BEVAL1Z board is required for quad-output (1+1+1+1) evaluation.

What power supply requirements must be met to operate the ISL91212AEVAL1Z?

The ISL91212AEVAL1Z requires three independent DC supplies: (1) 2.5–5.5V for AVIN and PVIN rails (up to 10A total), (2) 1.8V for VIO (I²C logic and GPIO), and (3) optional 1.8V for AVIN_FILT. Input decoupling uses 10µF ceramic + 47µF tantalum per PVIN rail; AVIN is filtered via onboard LDO and 10µF/100nF network as specified in FN8962 Section 8.2.

How is dynamic voltage scaling (DVS) implemented and verified on the ISL91212AEVAL1Z?

DVS is implemented via I²C register writes to BUCKx_VOUT registers or through hardware DVS pins (MPIO0–MPIO2 configured per IO_PINMODE=0x6 or 0x7). The board includes test points for VOUTx and corresponding DVS command signals, allowing oscilloscope capture of slew rates (e.g., 3mV/µs) and verification of monotonic transitions across 0.3V–2.0V as shown in Figures 21–22 of FN8962.

Can the ISL91212AEVAL1Z be used to measure light-load efficiency modes like Diode Emulation and Pulse Skipping?

Yes. The ISL91212AEVAL1Z supports automatic Diode Emulation and Pulse Skipping under light load (e.g., <100mA per phase), controlled by internal R5 Technology. Efficiency vs. load curves (Figures 9–10, 14–16) were measured using this board with precision electronic loads and current probes, confirming >85% efficiency at 10mA with 3.8VIN/1.0VOUT operation.