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Renesas ISL6328IRZ
- Part No.:
- ISL6328IRZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ISL6328IRZ.pdf
- Description:
- IC REG CTRLR AMD SVI 2OUT 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,331
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Product details
Overview
ISL6328IRZ from Intersil is a dual PWM controller IC designed specifically for AMD SVI split-plane processors, delivering precision core voltage (VDD) regulation via 1–4-phase synchronous buck conversion and independent Northbridge (VDDNB) regulation via single-phase buck control. It features ±0.6% system accuracy over temperature, fully differential DCR current sensing, and temperature-compensated load-line droop. Used in high-performance desktop and server CPU power delivery.
For engineers reviewing the ISL6328IRZ datasheet, ISL6328IRZ pinout, ISL6328IRZ application, or ISL6328IRZ equivalent, this page provides verified technical context, confirmed pin functions, real-world application mappings, and validated alternative options for AMD processor VR design - all grounded in FN7621 Rev 1.00 specification data.
Technical Context
The ISL6328IRZ implements two independent control loops: a multi-phase (1–4 phase) VR controller for AMD Core VDD with adaptive phase alignment (APA), dual-edge modulation, and continuous DCR-based current sensing; and a dedicated single-phase VR controller for VDDNB with integrated gate drivers and differential remote sensing. Both loops support serial VID (SVI) interface up to 3.4MHz and share a common PVCC bias rail.
It integrates dual MOSFET drivers per phase for the Core section (UGATE1/LGATE1/UGATE2/LGATE2), plus separate NB drivers (UGATE_NB/LGATE_NB), with shoot-through protection, GVOT LDO for gate voltage optimization in PSI mode, and programmable switching frequency up to 1MHz via FS pin resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | –40°C to +85°C - qualified for industrial-grade CPU power delivery in thermally demanding environments. |
| Core Voltage Accuracy | ±0.6% over temperature - enables tight regulation of AMD Core VDD without external calibration. |
| Switching Frequency | Up to 1 MHz - supports high-frequency, low-inductance designs reducing output filter size and cost. |
| Droop Current Tolerance | Core: 67–85 µA (4-phase); NB: 67–83 µA - sets precise load-line slope for bulk capacitor reduction. |
| SVI Clock Rate | Up to 3.4 MHz - meets AMD's high-speed serial VID protocol timing requirements. |
| OCP Response | Dual-tier: instant (IDD_SPIKE) and delayed overcurrent protection - ensures robust handling of transient spikes and sustained overload. |
| Gate Drive Strength | Upper drive: 2.5 Ω source / 2.0 Ω sink; Lower drive: 1.6 Ω source / 1.1 Ω sink - delivers fast, low-loss switching for high-efficiency power stages. |
Pinout & Package
ISL6328IRZ is housed in a 48-lead 6×6 mm QFN package (Pb-free, JEDEC-compliant) with exposed thermal pad. Pinout is validated per FN7621 Rev 1.00 Page 5–7.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| UGATE1, UGATE2, UGATE_NB | Upper MOSFET gate drive outputs | Drive high-side FETs in Core (2-phase internal) and Northbridge sections; include shoot-through monitoring. |
| LGATE1, LGATE2, LGATE_NB | Lower MOSFET gate drive outputs | Drive low-side FETs; monitored for adaptive dead-time control and PSI-mode diode emulation. |
| VSEN, VSEN_NB, RGND | Differential remote sense inputs | Connect directly to CPU VDD_SENSE/VSS_SENSE/VDDNB_SENSE pins for millivolt-level regulation accuracy. |
| SVC, SVD | Serial VID clock/data interface | Bi-directional SVI bus interface compliant with AMD processor dynamic VID updates and metal VID pre-PWROK handshake. |
| DRPCTRL | Droop configuration input | Resistor-programmable selection of Core/NB droop enable states and PSI phase count (1 or 2 active phases). |
| EN | System enable input | Threshold-sensitive (~0.85 V) global enable; also monitors external driver bias supply via resistor divider. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Phase Alignment (APA) | Programmable threshold via APA pin resistor-capacitor network - dynamically aligns PWM edges to minimize output ripple during load transients. |
| Fully Differential DCR Sensing | Continuous, temperature-compensated current measurement across ISENn+/ISENn− pairs - enables accurate channel balancing and load-line programming without current-sense resistors. |
| PSI_L Power Savings Mode | Phase shedding + gate voltage optimization + diode emulation - reduces quiescent losses at light loads while maintaining regulation stability. |
| Multi-tier Overvoltage Protection | Three-level OVP (OVP, pre-POR OVP, PWROK-driven) - prevents damage during startup, fault, or rail collapse events. |
| Simultaneous Digital Soft-Start | Coordinated ramp-up of both Core and NB outputs - eliminates cross-regulation issues and ensures monotonic power sequencing. |
Applications
| Desktop CPU Power Delivery | Server Processor VRM |
|---|---|
Use Scenario: High-current, multi-phase power delivery for AMD Phenom II and early Bulldozer-family CPUs on ATX motherboards. IC Role / Device Role / Timing Role: Dual-output VR controller managing Core VDD (1–4 phase) and Northbridge VDDNB (1-phase) via SVI interface. Use Value: Enables ±0.6% VDD regulation accuracy and temperature-compensated droop to reduce bulk capacitor count by >30% vs. fixed-setpoint solutions. |
Use Scenario: Redundant, high-reliability CPU power stage in 1U/2U rack servers requiring extended temperature operation. IC Role / Device Role / Timing Role: Primary VR controller with -40°C to +85°C rating, dual OCP tiers, and simultaneous soft-start for system-level power sequencing compliance. Use Value: Supports industrial-temperature operation and multi-tier fault protection to meet server uptime and safety standards (e.g., UL 60950-1). |
| AMD SVI Protocol Systems | Legacy Socket AM3 Platform Design |
Use Scenario: Implementation of AMD's Serial VID interface for dynamic voltage scaling and thermal throttling in OEM desktop platforms. IC Role / Device Role / Timing Role: SVI slave device interpreting SVD/SVC signals up to 3.4 MHz; generates PWM outputs synchronized to processor VID commands. Use Value: Eliminates need for external VID decoder logic and supports real-time voltage adjustment during load changes without firmware intervention. |
Use Scenario: Cost-optimized motherboard VRM for Socket AM3 CPUs where space and BOM count are constrained. IC Role / Device Role / Timing Role: Monolithic dual-controller with integrated drivers - replaces discrete PWM + driver combinations, reducing PCB area by ~40%. Use Value: Integrates 2x upper/lower drivers for Core and 1x for NB, cutting external component count by ≥12 MOSFET drivers and associated gate resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output CPU VR controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6323IRZ | Single-core VR controller (no Northbridge output); supports only 1–3 phases; lacks DRPCTRL and NB-specific pins (FB_NB, VSEN_NB). | Applicable only for Core-only designs; cannot replace ISL6328IRZ in split-plane AMD platforms requiring VDDNB regulation. | Select only if Northbridge is powered separately or integrated into Core VR; verify SVI compatibility and phase count match. |
| RT8803AZSP | Supports Intel IMVP-6/6.5, not AMD SVI; different pinout, no SVC/SVD interface; uses analog VID instead of serial protocol. | Designed for Intel Core i-series CPUs; incompatible with AMD SVI handshaking, metal VID, or PSI_L signaling. | Use only in Intel-based designs; requires full schematic and layout redesign - not a functional substitute for ISL6328IRZ. |
Compared with ISL6328IRZ, ISL6323IRZ omits Northbridge regulation capability and SVI-specific features, limiting its use to simpler Core-only topologies; RT8803AZSP targets a different processor ecosystem entirely and lacks hardware-level SVI support, making it unsuitable for AMD platform migration.
Availability
ISL6328IRZ is available at Aetrix Electronics and suitable for desktop motherboard design, server VRM development, and AMD processor reference platform validation requiring stable component supply and long-lifecycle support.
Supply support for ISL6328IRZ 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
Intersil (now part of Renesas Electronics) is a semiconductor company specializing in high-performance analog and power management ICs for computing, industrial, and communications markets.
The ISL6328IRZ belongs to Intersil's CPU VR controller product line, engineered specifically for AMD's SVI-based split-plane processor architectures to deliver tightly regulated, thermally robust, and protocol-compliant core and Northbridge power delivery.
FAQ
What is the operating temperature range of the ISL6328IRZ?
The ISL6328IRZ is rated for –40°C to +85°C ambient operation, as confirmed in the Ordering Information table on page 7 of FN7621 Rev 1.00. This industrial-grade rating makes it suitable for high-density desktop and entry-server motherboard applications where thermal margins are constrained. The ISL6328IRZ maintains ±0.6% system accuracy across this full range.
Does the ISL6328IRZ support AMD Serial VID (SVI) protocol?
Yes, the ISL6328IRZ natively supports AMD Serial VID (SVI) protocol via dedicated SVC (clock) and SVD (data) pins, with documented support for up to 3.4 MHz clock rates per page 1 of FN7621 Rev 1.00. It handles both pre-PWROK metal VID and active SVI mode, including PSI_L signaling for phase shedding - a core requirement for AMD Phenom II and early Bulldozer platforms.
How many phases does the ISL6328IRZ support for the Core voltage output?
The ISL6328IRZ supports 1-, 2-, 3-, or 4-phase operation for the Core voltage (VDD) output. Internal drivers handle up to 2 phases; 3- and 4-phase configurations require external PWM drivers connected to PWM3/PWM4 pins, as specified on page 1 of FN7621 Rev 1.00 and confirmed in the Functional Pin Descriptions for pins 36 and 37.
What is the purpose of the DRPCTRL pin on the ISL6328IRZ?
The DRPCTRL pin on the ISL6328IRZ configures load-line (droop) behavior for both Core and Northbridge outputs and determines active phase count in PSI mode. A resistor tied to GND sets 1-phase PSI operation; tied to VCC sets 2-phase PSI operation - per page 5 of FN7621 Rev 1.00. It enables four user-selectable droop combinations (Core/NB On/Off).
Is the ISL6328IRZ pin-compatible with other ISL63xx controllers?
No, the ISL6328IRZ is not pin-compatible with other ISL63xx controllers such as ISL6323IRZ or ISL6322IRZ. Its 48-pin QFN layout includes unique Northbridge-specific pins (e.g., FB_NB, VSEN_NB, UGATE_NB) and SVI interface signals (SVC/SVD) absent in single-output variants. Pin Configuration diagrams on page 5 of FN7621 confirm distinct placement and function.
ISL6328IRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tube
- 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:
- 48-QFN (6x6)
ISL6328IRZ FAQ
1.How can I place an order for ISL6328IRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6328IRZ 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 ISL6328IRZ reliable?
The price and inventory of ISL6328IRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6328IRZ is usually 5 days.
3.What payment methods are accepted for ISL6328IRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6328IRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6328IRZ?
ISL6328IRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6328IRZ 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 ISL6328IRZ?
For technical support, including ISL6328IRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6328IRZ requirements.
6.How does Aetrix verify that ISL6328IRZ is sourced from the original manufacturer or authorized distributors?
All ISL6328IRZ 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 ISL6328IRZ meets industry standards.
7.What is the process for return or replacement of ISL6328IRZ?
All ISL6328IRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6328IRZ, 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 ISL6328IRZ part is unused and in its original packaging.
Return procedure for ISL6328IRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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