Renesas ISL91302BIKZT7AR5851

Overview

ISL91302BIKZT7AR5851 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 0.3V–2.0V output voltage range via I²C/SPI, achieves 94.7% peak efficiency at 3.8V_IN/1.8V_OUT, and integrates low R_DS(ON) MOSFETs (23mΩ HS / 9mΩ LS) for mobile CPU/GPU core power.

For engineers reviewing the ISL91302BIKZT7AR5851 datasheet, ISL91302BIKZT7AR5851 pinout, ISL91302BIKZT7AR5851 application, or ISL91302BIKZT7AR5851 equivalent, key selection considerations 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 factory-configurable DVS slew rate for dynamic power management in space-constrained portable designs.

Technical Context

The ISL91302BIKZT7AR5851 implements Renesas' proprietary R5 modulator architecture, enabling seamless transitions between discontinuous (DCM) and continuous conduction mode (CCM) without external compensation while maintaining loop stability. Its dual-controller topology allows independent configuration of phase assignment and control loops for each output rail.

It integrates four fully synchronous buck power stages with internal high-side and low-side MOSFETs, supporting programmable decay modes, automatic diode emulation in light-load conditions, and real-time telemetry via an on-chip 10-bit ADC for voltage, current, and temperature monitoring across both outputs.

Key Specifications

Pinout & Package

ISL91302BIKZT7AR5851 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 regulator applications.

Compared with ISL91301B and ISL91211B, the ISL91302BIKZT7AR5851 uniquely combines 5A-per-phase scalability, R5 modulator transient performance, dual DVS, and integrated ADC telemetry-making it the only option among the three capable of meeting smartphone AP and high-end FPGA core power requirements with minimal external components.

Availability

ISL91302BIKZT7AR5851 is available at Aetrix Electronics and suitable for smartphone application processor power, FPGA core voltage regulation, and industrial MPU power supply requiring stable component supply, full lifecycle support, and RoHS-compliant WLCSP packaging.

Supply support for ISL91302BIKZT7AR5851 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 SoC solutions for automotive, industrial, and consumer markets.

The ISL91302B belongs to Renesas' high-efficiency multiphase PMIC product line, designed specifically for dynamic, space-constrained core power delivery in advanced mobile and embedded processors.

FAQ

What output configurations does the ISL91302BIKZT7AR5851 support?

The ISL91302BIKZT7AR5851 supports three factory OTP-configurable output topologies: 4-phase single output (4+0), 3-phase + 1-phase dual output (3+1), and 2-phase + 2-phase dual output (2+2). Each configuration leverages the same four integrated power stages and dual controllers, allowing designers to optimize phase count per rail based on current demand, thermal distribution, and PCB layout constraints without changing the ISL91302BIKZT7AR5851 footprint.

How does the R5 modulator in the ISL91302BIKZT7AR5851 improve transient response?

The R5 modulator in the ISL91302BIKZT7AR5851 enables ultra-fast transient response-up to 50A/µs per phase-by dynamically adjusting duty cycle with sub-microsecond latency and maintaining loop stability across DCM/CCM boundaries without external compensation components. This eliminates voltage droop during rapid CPU/GPU DVFS events and reduces required output capacitance compared to conventional voltage-mode or current-mode controllers.

What is the role of remote sensing (VOUT1/RTN1 and VOUT2/RTN2) in the ISL91302BIKZT7AR5851?

The ISL91302BIKZT7AR5851 uses dedicated VOUT1/RTN1 and VOUT2/RTN2 pins for Kelvin-style remote voltage sensing at the point-of-load. This compensates for IR drop across PCB traces and package inductance, achieving ±0.7% system accuracy over temperature. For example, with a 50mΩ trace resistance and 5A load, remote sensing prevents ~250mV regulation error that would occur with local feedback.

Can the ISL91302BIKZT7AR5851 operate with a 2MHz switching frequency?

Yes, the ISL91302BIKZT7AR5851 supports OTP-programmable PWM frequencies from 2MHz to 6MHz. At 2MHz, it maintains high efficiency (e.g., >90% at 1.0V/5A) while relaxing inductor and capacitor size constraints-ideal for cost-sensitive or thermally constrained designs where higher-frequency operation isn't required. The R5 modulator ensures stable operation across the full frequency range without retuning.

Does the ISL91302BIKZT7AR5851 integrate protection features beyond overvoltage and overcurrent?

Yes, the ISL91302BIKZT7AR5851 includes comprehensive hardware-based protection: over-temperature shutdown (trip at +140°C, +60°C hysteresis), thermal warning alert (+85°C threshold), undervoltage lockout (UVLO rising at 2.60V), short-circuit protection, and independent overvoltage/undervoltage detection per output (±250mV thresholds). All protections trigger fast fault reporting via the INT pin and can be configured to initiate graceful shutdown or latch-off.