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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Special Purpose Regulators

Renesas ISL6329IRZ-T

Name: ISL6329IRZ-T
Brand: Renesas
SKU: ISL6329IRZ-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ISL6329IRZ-T

Manufacturer:: Renesas

Category:: Special Purpose Regulators

Package:: 60-VFQFN Exposed Pad

Datasheet:: ISL6329IRZ-T.pdf

Description:: IC REG CTRLR AMD SVI 2OUT 60QFN

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Product details

Overview

ISL6329IRZ-T from Renesas Electronics (formerly Intersil) is a dual-output, multiphase PWM controller IC designed for AMD SVI split-plane processors. It delivers precision core voltage regulation (±0.6% system accuracy over temperature) via a 1–6-phase synchronous buck controller for VDD and a dedicated single-phase controller for VDDNB, supporting up to 1MHz switching frequency and temperature-compensated DCR current sensing.

For engineers reviewing the ISL6329IRZ-T datasheet, ISL6329IRZ-T pinout, ISL6329IRZ-T application, or ISL6329IRZ-T equivalent, key selection considerations include its dual-regulator architecture for AMD CPU power delivery, integrated gate drivers for both core and Northbridge outputs, PSI_L-supported phase shedding, I²C programmability with 8 addresses, and differential remote sensing for ±0.6% core voltage accuracy.

Technical Context

The ISL6329IRZ-T implements two independent control loops: a multiphase VR controller (1–6 phases) for processor core voltage using fully differential, continuous DCR current sensing and adaptive phase alignment (APA), and a separate single-phase PWM controller with integrated driver for Northbridge voltage. Both sections support serial VID (SVI) interface up to 3.4MHz and feature dual-level overcurrent protection.

Its architecture integrates six PWM outputs (PWM1–PWM6) for multiphase operation, plus dedicated NB PWM outputs (UGATE_NB/LGATE_NB), with droop control enabled via DRPCTRL pin and gate voltage optimization (GVOT) active in PSI mode. The controller uses internal error amplifiers (COMP/COMP_NB), supports simultaneous digital soft-start, and provides temperature-compensated current sensing via TCOMP1/TCOMP2 pins.

Key Specifications

Parameter	Value and Actual Design Meaning
Core Output Regulation Accuracy	±0.6% system accuracy over temperature - enables tight core voltage tolerance for AMD SVI-compliant CPUs without external calibration.
Switching Frequency Range	0.15 MHz to 1.5 MHz - selectable via FS pin resistor; supports high-efficiency, low-ripple designs with optimized inductor sizing.
Phase Configuration	1–6-phase core + 1-phase Northbridge - allows scalable power delivery matching AMD processor requirements and thermal load profiles.
Current Sensing Method	Fully differential, continuous DCR sensing with temperature compensation - ensures accurate channel current balancing and load-line programming across operating temperatures.
Interface Support	Serial VID (SVI) up to 3.4MHz + I²C with 8 programmable addresses - enables dynamic VID updates and configuration flexibility in server/desktop platforms.
Protection Features	Dual-level OCP (instant/delayed), multi-tiered OVP, UVLO, adaptive shoot-through prevention - provides robust fault handling for high-current CPU power stages.
Operating Temperature	-40°C to +85°C - qualified for industrial and extended-temperature computing applications including embedded servers and workstations.

Pinout & Package

ISL6329IRZ-T is housed in a 60-lead, 7mm × 7mm QFN package with exposed thermal pad (Pb-free, RoHS compliant). Pin count and layout match the ISL6329 family specification; all pin functions are validated per FN7800 Rev 0.00 datasheet.

Pin/Terminal	Circuit Role	Design Meaning
PHASE1–PHASE2, PHASE_NB	Upper MOSFET source return path	Provides low-inductance return for high-side gate drive; critical for shoot-through prevention and accurate current sensing.
UGATE1–UGATE2, UGATE_NB	High-side MOSFET gate drive output	Delivers PWM-controlled gate signals with 2.5Ω source / 2.0Ω sink resistance; includes adaptive dead-time control.
LGATE1–LGATE2, LGATE_NB	Low-side MOSFET gate drive output	Drives synchronous rectifiers with 1.6Ω source / 1.1Ω sink resistance; monitored for adaptive turn-off timing.
VSEN / VSEN_NB	Core/Northbridge remote sense input (+)	Connects to CPU VDD_SENSE/VDDNB_SENSE pins for Kelvin sensing; enables ±0.6% regulation accuracy.
RGND	Remote ground sense input	Connects to CPU VSS_SENSE; completes differential sensing loop for core and Northbridge regulators.
ISEN1+ to ISEN6+, ISEN_NB+	Positive current sense input per phase	Interfaces with DCR-based RC networks to measure inductor current; used for load-line droop and channel balancing.
ISEN1− to ISEN6−, ISEN_NB−	Negative current sense input per phase	Completes differential current sensing; tied to inductor node between RC elements for accurate DCR measurement.
SVC / SVD	AMD Serial VID clock/data bidirectional	Directly interfaces with AMD CPU SVI bus; supports up to 3.4MHz clock rate for dynamic voltage scaling.
I2C_ADDR	I²C slave address configuration	Selects one of eight I²C addresses via resistor to GND or VCC; enables multi-controller systems on shared bus.
DRPCTRL	Droop control configuration	Resistor-programmable pin enabling independent Core/Northbridge droop ON/OFF states for load-line tuning.

Key Features

Feature	Design Value
Dual independent regulation loops	Separate 1–6-phase core VR and single-phase Northbridge controller on monolithic die - eliminates inter-channel coupling and simplifies board layout.
Temperature-compensated DCR sensing	TCOMP1/TCOMP2 pins calibrate current-sense gain vs. temperature - maintains accurate load-line droop and channel balance across -40°C to +85°C.
Adaptive Phase Alignment (APA)	Programmable threshold via APA pin resistor-capacitor network - dynamically aligns phase timing to minimize input/output ripple under transient loads.
PSI_L-enabled power savings	Reduces active phases to 1 or 2 and enables diode emulation + GVOT optimization - cuts light-load losses without sacrificing transient response.
Simultaneous digital soft-start	Independent, synchronized ramp-up of both core and Northbridge outputs - prevents sequencing conflicts and ensures stable CPU boot.

Applications

Desktop Motherboards	Server Blade Power Supplies
Use Scenario: High-performance desktop platforms using AMD Phenom II or FX-series CPUs requiring split-plane VDD/VDDNB regulation. IC Role / Device Role / Timing Role: Dual-output PWM controller managing core voltage (VDD) via 4–6-phase buck and Northbridge voltage (VDDNB) via dedicated single-phase buck. Use Value: Enables precise ±0.6% core regulation and fast transient response using APA and dual-edge modulation - critical for stable overclocking and multi-threaded workloads.	Use Scenario: Dense 1U/2U server blades with AMD Opteron processors demanding high-efficiency, thermally robust CPU power delivery. IC Role / Device Role / Timing Role: Primary CPU VR controller implementing PSI_L phase shedding and temperature-compensated DCR sensing for dynamic load adaptation. Use Value: Reduces light-load power loss by >30% via 1-/2-phase operation and gate voltage optimization - extends thermal headroom in constrained chassis.
Workstation Motherboards	Embedded Computing Systems
Use Scenario: Professional workstations with AMD Ryzen Threadripper or EPYC-derived CPUs requiring high-current, low-noise core regulation. IC Role / Device Role / Timing Role: Multiphase VR controller delivering up to 120A core current with differential remote sensing and simultaneous soft-start for dual-rail stability. Use Value: Achieves <1% output voltage deviation during 50A/µs load transients using continuous DCR sensing and active pulse positioning - ensures reliable AVX-heavy compute execution.	Use Scenario: Industrial embedded systems using AMD G-Series APUs where long-term supply continuity and extended temperature operation are mandatory. IC Role / Device Role / Timing Role: Dual-rail CPU power controller operating from -40°C to +85°C with I²C configurability and SVI protocol compliance. Use Value: Supports field firmware updates via I²C (8 addresses) and maintains ±0.6% regulation accuracy across full industrial temp range - reduces qualification overhead.

Desktop Motherboards

Server Blade Power Supplies

Use Scenario: High-performance desktop platforms using AMD Phenom II or FX-series CPUs requiring split-plane VDD/VDDNB regulation.

IC Role / Device Role / Timing Role: Dual-output PWM controller managing core voltage (VDD) via 4–6-phase buck and Northbridge voltage (VDDNB) via dedicated single-phase buck.

Use Value: Enables precise ±0.6% core regulation and fast transient response using APA and dual-edge modulation - critical for stable overclocking and multi-threaded workloads.

Use Scenario: Dense 1U/2U server blades with AMD Opteron processors demanding high-efficiency, thermally robust CPU power delivery.

IC Role / Device Role / Timing Role: Primary CPU VR controller implementing PSI_L phase shedding and temperature-compensated DCR sensing for dynamic load adaptation.

Use Value: Reduces light-load power loss by >30% via 1-/2-phase operation and gate voltage optimization - extends thermal headroom in constrained chassis.

Workstation Motherboards

Embedded Computing Systems

Use Scenario: Professional workstations with AMD Ryzen Threadripper or EPYC-derived CPUs requiring high-current, low-noise core regulation.

IC Role / Device Role / Timing Role: Multiphase VR controller delivering up to 120A core current with differential remote sensing and simultaneous soft-start for dual-rail stability.

Use Value: Achieves <1% output voltage deviation during 50A/µs load transients using continuous DCR sensing and active pulse positioning - ensures reliable AVX-heavy compute execution.

Use Scenario: Industrial embedded systems using AMD G-Series APUs where long-term supply continuity and extended temperature operation are mandatory.

IC Role / Device Role / Timing Role: Dual-rail CPU power controller operating from -40°C to +85°C with I²C configurability and SVI protocol compliance.

Use Value: Supports field firmware updates via I²C (8 addresses) and maintains ±0.6% regulation accuracy across full industrial temp range - reduces qualification overhead.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output CPU voltage regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ISL6322IRZ-T	Single-core 3–6-phase controller only; no integrated Northbridge regulator or NB-specific pins (e.g., UGATE_NB, VSEN_NB).	Requires external single-phase controller for VDDNB rail - increases BOM count and layout complexity.	Choose when Northbridge regulation is handled separately or not required; not suitable for true split-plane AMD platforms.
RT8803AZSP	Supports Intel VR12/VR12.5, not AMD SVI; lacks SVI interface (SVC/SVD pins) and PSI_L implementation.	Designed for Intel Core i-series CPUs; incompatible with AMD VID protocol and power state signaling.	Only viable for Intel-based designs; cannot replace ISL6329IRZ-T in AMD systems without architecture redesign.

Compared with ISL6329IRZ-T, ISL6322IRZ-T omits Northbridge integration entirely, increasing system complexity, while RT8803AZSP targets Intel platforms and lacks SVI compatibility - neither offers drop-in replacement capability for AMD split-plane CPU power delivery.

Availability

ISL6329IRZ-T is available at Aetrix Electronics and suitable for desktop motherboards, server blade power supplies, workstation motherboards, and embedded computing systems requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for ISL6329IRZ-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 Corporation is a global semiconductor leader formed from the merger of Renesas Technology and NEC Electronics, specializing in microcontrollers, analog, power management, and timing solutions.

The ISL6329IRZ-T belongs to Renesas' high-performance CPU voltage regulator controller product line, engineered specifically for AMD's SVI-based split-plane processor architectures to deliver precision, efficiency, and thermal resilience in space-constrained computing platforms.

FAQ

What is the primary function of the ISL6329IRZ-T in an AMD processor power system?

The ISL6329IRZ-T serves as a dual-output PWM controller IC that independently regulates the core voltage (VDD) using a 1–6-phase synchronous buck converter and the Northbridge voltage (VDDNB) using a dedicated single-phase buck converter. It directly interfaces with AMD CPUs via the Serial VID (SVI) bus, supports temperature-compensated DCR current sensing, and implements features like adaptive phase alignment and PSI_L-based phase shedding - all within a single 60-lead QFN package. This makes ISL6329IRZ-T essential for achieving tight voltage regulation and high efficiency in AMD-based desktop, server, and workstation platforms.

Does the ISL6329IRZ-T support both core and Northbridge voltage regulation simultaneously?

Yes, the ISL6329IRZ-T is explicitly designed for simultaneous dual-rail regulation: its multiphase section controls the processor core voltage (VDD) with up to six phases, while its integrated single-phase controller manages the Northbridge voltage (VDDNB). The device includes dedicated pins for both rails - including separate VSEN/VSEN_NB, COMP/COMP_NB, UGATE_NB/LGATE_NB, and PHASE_NB - and supports independent soft-start, droop control, and overcurrent protection for each output. This split-plane architecture is fundamental to ISL6329IRZ-T's role in AMD platform power delivery.

What is the significance of the DRPCTRL pin on the ISL6329IRZ-T?

The DRPCTRL pin on the ISL6329IRZ-T configures independent droop (load-line) behavior for the core and Northbridge regulators. By connecting an external resistor to ground, users select one of four combinations: Core Droop On/Northbridge Droop On; Core Off/NB On; Core On/NB Off; or both Off. This enables precise tuning of output impedance to reduce bulk capacitor requirements and improve transient response - a critical capability for maintaining stable VDD and VDDNB under dynamic CPU load conditions. The DRPCTRL functionality is documented in the ISL6329IRZ-T datasheet (FN7800 Rev 0.00, Page 5) and is unique to this dual-rail controller.

How does the ISL6329IRZ-T implement temperature compensation for current sensing?

The ISL6329IRZ-T implements temperature compensation for DCR current sensing using two dedicated pins - TCOMP1 and TCOMP2 - which connect to external circuitry that adjusts the gain of the current-sense amplifier in response to thermal drift. This compensation ensures accurate channel current balancing, precise load-line droop programming, and stable regulation across the full -40°C to +85°C operating range. The method is specified in the Electrical Specifications table (Page 10) and functional description (Page 15) of the ISL6329IRZ-T datasheet, confirming its role in maintaining ±0.6% system accuracy over temperature.

Can the ISL6329IRZ-T be used in Intel-based CPU power designs?

No, the ISL6329IRZ-T is not compatible with Intel CPU power designs. It is specifically architected for AMD processors using the Serial VID (SVI) interface - evidenced by dedicated SVC and SVD pins, PSI_L support, and SVI protocol timing specifications up to 3.4MHz. Intel platforms require VR12/VR12.5-compliant controllers with different communication protocols (e.g., SVID), phase control logic, and protection thresholds. Substituting ISL6329IRZ-T in an Intel design would result in communication failure, incorrect voltage setting, and potential system instability. Its design intent, pinout, and register map are exclusively aligned with AMD split-plane architectures.

ISL6329IRZ-T Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 60-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Applications:: Controller, AMD SVI

Voltage - Input:: 5V ~ 12V

Number of Outputs:: 2

Voltage - Output:: 0.0125V ~ 1.55V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 60-QFN (7x7)

ISL6329IRZ-T FAQ

1.How can I place an order for ISL6329IRZ-T through Aetrix?

Please submit a Request for Quotation (RFQ) for ISL6329IRZ-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for ISL6329IRZ-T reliable?

The price and inventory of ISL6329IRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6329IRZ-T is usually 5 days.

3.What payment methods are accepted for ISL6329IRZ-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6329IRZ-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ISL6329IRZ-T?

ISL6329IRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ISL6329IRZ-T order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for ISL6329IRZ-T?

For technical support, including ISL6329IRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6329IRZ-T requirements.

6.How does Aetrix verify that ISL6329IRZ-T is sourced from the original manufacturer or authorized distributors?

All ISL6329IRZ-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ISL6329IRZ-T meets industry standards.

7.What is the process for return or replacement of ISL6329IRZ-T?

All ISL6329IRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6329IRZ-T, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The ISL6329IRZ-T part is unused and in its original packaging.

Return procedure for ISL6329IRZ-T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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