Renesas ISL91302BIKZ-T

Overview

ISL91302BIKZ-T from Renesas Electronics is a dual/single-output synchronous multiphase buck PMIC with four integrated power stages and two controllers, configurable as 4+0, 3+1, or 2+2 phase outputs. It delivers up to 5A per phase, supports 2.5V–5.5V input, achieves 94.7% peak efficiency at 3.8V_IN/1.8V_OUT, and targets CPU/GPU core power in mobile applications.

For engineers reviewing the ISL91302BIKZ-T datasheet, ISL91302BIKZ-T pinout, ISL91302BIKZ-T application, or ISL91302BIKZ-T equivalent, key selection criteria include its R5 modulator-based ultra-fast transient response (50A/µs per phase), ±0.7% system accuracy with remote sensing, OTP-programmable 2–6MHz PWM frequency, and dual I²C/SPI programmability for dynamic voltage scaling across two independent outputs.

Technical Context

The ISL91302BIKZ-T implements Renesas' proprietary R5 modulator architecture to enable seamless DCM/CCM transitions without external compensation, delivering ultra-fast load transient response and robust loop stability. Its four integrated power stages-each with 23mΩ high-side and 9mΩ low-side MOSFETs-are flexibly assignable across two independent buck controllers.

Configuration is factory-set via OTP and supports three output topologies: single 4-phase (4+0), dual 3-phase + 1-phase (3+1), or dual 2-phase (2+2). Each output features independent dynamic voltage scaling (DVS) with selectable slew rate (e.g., 3mV/µs), telemetry-enabled voltage/current/temperature monitoring via internal ADC, and comprehensive fault protection including UV/OV/OC/OT and short-circuit detection.

Key Specifications

Pinout & Package

ISL91302BIKZ-T uses a 2.551mm × 3.670mm, 54-ball WLCSP package with 0.4mm pitch, optimized for ultra-compact mobile PCB layouts and high-density integration.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multiphase buck PMIC applications.

Compared with ISL91302BIKZ-T, ISL91302BIIZ-T offers identical performance in a different reel size, while ISL91301B trades phase count and current capability for smaller footprint and lower cost-making it viable only where 4+0 configuration or 5A/phase is not required.

Availability

ISL91302BIKZ-T is available at Aetrix Electronics and suitable for smartphone SoC core power, FPGA dynamic voltage scaling, and industrial MPU power requiring stable component supply, long-term lifecycle support, and RoHS-compliant WLCSP packaging.

Supply support for ISL91302BIKZ-T 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 ISL91302B product line delivers highly integrated, configurable multiphase buck PMICs designed specifically for mobile and portable applications demanding ultra-small form factor, fast transient response, and multi-rail flexibility.

FAQ

What output configurations does the ISL91302BIKZ-T support?

The ISL91302BIKZ-T supports three factory-configurable output topologies: single 4-phase (4+0), dual 3-phase + 1-phase (3+1), or dual 2-phase (2+2). These are set via OTP programming and determine how its four integrated power stages are assigned between two independent buck controllers. The ISL91302BIKZ-T does not support reconfiguration in-circuit - topology is fixed at manufacturing.

How does the ISL91302BIKZ-T achieve ultra-fast transient response?

The ISL91302BIKZ-T achieves ultra-fast transient response using Renesas' proprietary R5 modulator architecture, which enables sub-microsecond load step recovery without external compensation. Its design supports up to 50A/µs per phase slew rate, and integrated low-impedance MOSFETs (23mΩ HS / 9mΩ LS) minimize voltage droop. The ISL91302BIKZ-T also reduces output capacitance requirements by maintaining stability during DCM/CCM transitions.

What is the role of AVIN_FILT and how should it be decoupled?

AVIN_FILT is an internally filtered analog supply output derived from AVIN, used to power sensitive analog blocks including the ADC and reference circuits. It must be decoupled with a minimum 1µF X5R/X7R ceramic capacitor placed within 1mm of the ISL91302BIKZ-T ball. This ensures clean reference voltage for telemetry accuracy and prevents noise coupling into voltage-sense paths - critical for achieving the ISL91302BIKZ-T's ±0.7% system accuracy.

Can the ISL91302BIKZ-T operate with only one output enabled?

Yes, the ISL91302BIKZ-T supports independent enable/disable of each buck output via dedicated BUCKx_EN registers over I²C/SPI. When one output is disabled, its associated power stages enter high-impedance state and contribute negligible quiescent current (<1µA per disabled buck in shutdown). This allows partial operation - e.g., powering only the CPU rail while GPU remains off - without compromising efficiency or thermal performance of the active output.

What thermal protection features are built into the ISL91302BIKZ-T?

The ISL91302BIKZ-T includes three-tier thermal protection: thermal shutdown triggers at +140°C (±10°C accuracy) with +60°C hysteresis; thermal warning alert activates at +85°C (±10°C) to signal firmware for proactive throttling; and thermal derating is supported via ADC telemetry for closed-loop temperature management. All thresholds are factory-programmed and can be monitored or overridden via I²C/SPI registers - ensuring safe operation across the full -40°C to +85°C ambient range.