Renesas ISL68124IRAZ-T

Overview

ISL68124IRAZ-T from Renesas (formerly Intersil) is a digital dual-output, 4-phase configurable PWM controller supporting PMBus 1.3 for server and telecom point-of-load regulation. It enables flexible phase allocation (e.g., 3+1 or 2+2), delivers ±0.5% closed-loop system accuracy via differential remote sensing, and features zero-latency synthetic current control with dual-edge modulation for fast transient response. Used in FPGA/ASIC power delivery with ISL99227 smart power stages.

For engineers reviewing the ISL68124IRAZ-T datasheet, ISL68124IRAZ-T pinout, ISL68124IRAZ-T application, or ISL68124IRAZ-T equivalent, key selection criteria include its 40-pin 5×5 mm TQFN package, programmable auto phase add/drop thresholds, PMBus telemetry (VIN/VOUT/IOUT/temperature), ±4.5°C thermal sensor accuracy, and support for DCR/resistor/SPS current sensing with integrated temperature compensation.

Technical Context

The ISL68124IRAZ-T implements a proprietary linear synthetic digital current modulation scheme-enabling constant-frequency dual-edge PWM where both leading and trailing edges are independently adjusted to minimize latency and maximize HF current balance across phases. Its architecture integrates per-phase cycle-by-cycle overcurrent protection, summed output OCP, and black-box fault recording.

It supports two independent voltage rails with fully programmable phase assignment (X+Y ≤ 4), on-chip NVM storing up to eight configurations selectable via CONFIG pin-strapping, and comprehensive PMBus 1.3 command set including telemetry registers for input/output power, temperature, and fault status at up to 2 MHz bus speed.

Key Specifications

Pinout & Package

ISL68124IRAZ-T is housed in a RoHS-compliant 40-lead 5×5 mm TQFN package (PKG DWG L40.5x5D) with exposed thermal pad (EPAD) connected to GND. The package supports high-power density layouts with low thermal resistance (θ_JA = 30°C/W, θ_JC = 1.2°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multiphase PWM controller applications.

Compared with ISL68134IRAZ and MP8765GL-10, the ISL68124IRAZ-T uniquely balances full PMBus 1.3 telemetry, dual-output configurability, and on-chip NVM-making it optimal for high-reliability, serviceable power systems where remote monitoring and configuration agility are critical.

Availability

ISL68124IRAZ-T is available at Aetrix Electronics and suitable for networking equipment, telecom/datacom infrastructure, and server/storage power supply designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ISL68124IRAZ-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 acquired Intersil in 2017 and maintains full technical and supply chain continuity for its high-performance analog and power management portfolio.

The ISL68124IRAZ-T belongs to Renesas' digital multiphase controller product line, engineered specifically for high-efficiency, telemetry-rich point-of-load regulation in cloud-scale computing and 5G infrastructure.

FAQ

What is the maximum supported switching frequency for the ISL68124IRAZ-T?

The ISL68124IRAZ-T supports a programmable switching frequency range from 200 kHz to 1000 kHz, with ±4% accuracy across temperature. At the nominal 500 kHz setting, the device achieves 480–520 kHz operation, enabling optimized trade-offs between magnetic size, efficiency, and transient response in high-density server and telecom POL designs. The ISL68124IRAZ-T maintains constant frequency under DC loads while dynamically adjusting edges for transients.

Does the ISL68124IRAZ-T support both DCR and smart power stage current sensing?

Yes, the ISL68124IRAZ-T natively supports three current sensing methods: smart power stage (e.g., ISL99227), discrete DCR networks, and precision shunt resistors. Each method uses dedicated CS/CSRTN differential inputs with integrated temperature compensation for DCR sensing. The ISL68124IRAZ-T's current sense accuracy is ±2% from ISEN to ADC, ensuring consistent load-line regulation and overcurrent protection regardless of sensing topology selected in PowerNavigator.

How many configurations can be stored in the ISL68124IRAZ-T's on-chip NVM?

The ISL68124IRAZ-T includes on-chip nonvolatile memory capable of storing up to eight complete user-defined configurations-including output voltages, phase assignments, protection thresholds, droop coefficients, and PMBus addresses. These configurations are selected at power-on via the CONFIG pin-strapping option, allowing rapid deployment of different power profiles without host intervention. This capability is intrinsic to the ISL68124IRAZ-T's architecture and requires no external memory.

What thermal protection features does the ISL68124IRAZ-T provide?

The ISL68124IRAZ-T provides dual-channel thermal monitoring via TMON0 and TMON1 pins, supporting diode-connected transistors or smart power stage thermal diodes across -50°C to +150°C with ±4.5°C accuracy. It generates an open-drain TWARN signal upon overtemperature detection without disabling outputs, and supports full thermal shutdown if thresholds are exceeded. These functions are fully programmable via PMBus and logged in the black-box fault recorder-key capabilities embedded in the ISL68124IRAZ-T for mission-critical reliability.

Can the ISL68124IRAZ-T operate in single-output mode with all four phases on one rail?

Yes, the ISL68124IRAZ-T supports 4+0 single-output mode, allocating all four PWM outputs and current sense channels to one regulated rail while leaving the second output disabled. This configuration is commonly used for high-current FPGA or GPU core supplies. Phase assignment is configured via PowerNavigator GUI or PMBus commands, and the ISL68124IRAZ-T maintains full telemetry, auto phase add/drop, and protection functionality in this mode-no hardware changes are required.