Renesas ISL69138IRAZ-T

Overview

ISL69138IRAZ-T from Renesas Electronics is a digital, dual-output, 7-phase configurable PWM controller compliant with Intel VR13 and IMVP8 specifications. It supports flexible phase allocation (e.g., 6+1, 5+2, 3+3) across two outputs, delivers up to 1MHz switching frequency, features SVID and PMBus 1.3 interfaces, and enables precise core/mem rail regulation in high-performance server and desktop platforms.

For engineers reviewing the ISL69138IRAZ-T datasheet, ISL69138IRAZ-T pinout, ISL69138IRAZ-T application, or ISL69138IRAZ-T equivalent, key selection considerations include VR13/IMVP8 compliance, synthetic current modulation architecture, diode emulation for light-load efficiency, auto phase add/drop behavior, and PowerNavigator™-based configuration via SMBus/PMBus 1.3 at up to 2MHz.

Technical Context

The ISL69138IRAZ-T implements Renesas' proprietary linear, synthetic, zero-latency current modulation scheme to achieve fast transient response and high-frequency current balance without external current-sense resistors. It supports DCR sensing with integrated temperature compensation and delivers ±0.5% closed-loop system accuracy using differential remote voltage sensing.

Its fault management includes pulse-by-pulse phase current limiting, total output current protection, configurable catastrophic failure protection (CFP), open voltage sense detection, and black box fault recording. Configuration and monitoring are performed via PMBus 1.3/SMBus interface with NVM storing up to eight user-defined configurations.

Key Specifications

Pinout & Package

ISL69138IRAZ-T is housed in a 48-pin QFN package (7mm × 7mm, 0.5mm pitch) with exposed thermal pad. Pin assignment follows Renesas' standard VR controller layout optimized for SVID signaling, phase driver interfacing, and remote sensing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL69138IRAZ-T, ISL69147IRAZ-T offers simplified single-rail control but sacrifices CPU-integrated SVID communication and dual-rail flexibility, while RTQ2132B-QA provides automotive qualification and analog VID but lacks essential VR13 protocol features - making ISL69138IRAZ-T the only option for Intel-compliant dual-rail server/desktop core regulation.

Availability

ISL69138IRAZ-T is available at Aetrix Electronics and suitable for high-performance server core rails, graphics memory regulation, and overclocked desktop platforms requiring stable component supply, long-term lifecycle support, and full VR13/IMVP8 compliance.

Supply support for ISL69138IRAZ-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 delivering microcontrollers, analog, power, and SoC solutions for industrial, automotive, and data infrastructure markets.

The ISL69138IRAZ-T belongs to Renesas' Smart Power Controller product line, engineered specifically for high-efficiency, digitally controlled multiphase VRs targeting Intel VR13 and IMVP8-compliant computing platforms.

FAQ

What is the primary compliance standard supported by the ISL69138IRAZ-T?

The ISL69138IRAZ-T is fully compliant with Intel VR13 and IMVP8 specifications. It implements the required SVID interface, DVID protocol, and dynamic current reporting necessary for direct communication with Intel Core and Xeon processors. This compliance ensures seamless integration into certified VR13/IMVP8 platforms without firmware or hardware adaptation - a requirement confirmed in the FN8914 Rev. 2.00 datasheet.

Does the ISL69138IRAZ-T support dual-output operation with independent phase assignment?

Yes, the ISL69138IRAZ-T supports dual-output operation with fully configurable phase allocation where X + Y ≤ 7 total phases. Valid configurations include 6+1, 5+2, 4+2, 3+3, and even 7+0. Each output has independent loop compensation, current sensing, and fault management - enabling asymmetric rail regulation for CPU core and memory rails within a single IC, as documented in the ISL69138 feature list and application diagrams.

How does the ISL69138IRAZ-T achieve ±0.5% voltage regulation accuracy?

The ISL69138IRAZ-T achieves ±0.5% closed-loop system accuracy using differential remote voltage sensing (VSNSP/VSNSN pins) combined with on-chip calibration and temperature-compensated DCR current sensing. This architecture eliminates PCB trace IR drop errors and maintains tight tolerance across load, line, and temperature - a specification explicitly guaranteed in the "Electrical Specifications" section of the FN8914 datasheet.

Can the ISL69138IRAZ-T be configured without external programming hardware?

Yes, the ISL69138IRAZ-T is configured exclusively via its PMBus 1.3 or SVID interface using Renesas' PowerNavigator™ GUI software. No external programmer or JTAG adapter is required - all settings (phase count, loop gains, fault thresholds, DVID offsets) are written over the bus and stored in on-chip NVM. This enables in-system configuration and field updates without soldering or hardware modification.

What fault protection mechanisms are integrated into the ISL69138IRAZ-T?

The ISL69138IRAZ-T integrates pulse-by-pulse phase current limiting, total output current protection, input/output overvoltage and undervoltage detection, open voltage sense detection, and configurable Catastrophic Failure Protection (CFP) flag output. It also includes black box fault logging that records timestamps and conditions for up to eight prior faults - all verified in the "Fault Management" section of the FN8914 datasheet.