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Renesas ISL6312AIRZ
- Part No.:
- ISL6312AIRZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ISL6312AIRZ.pdf
- Description:
- IC REG CTRLR VR10 1OUT 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,006
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Product details
Overview
ISL6312AIRZ from Renesas Electronics (formerly Intersil) is a four-phase buck PWM controller with integrated MOSFET drivers, designed for precision core voltage regulation in Intel VR10/VR11 and AMD microprocessor power delivery systems. It supports -40°C to +85°C operation, delivers ±0.5% system accuracy over temperature, enables active pulse positioning (APP) modulation, and features fully differential DCR current sensing for channel balancing.
For engineers reviewing the ISL6312AIRZ datasheet, ISL6312AIRZ pinout, ISL6312AIRZ application, or ISL6312AIRZ equivalent, key selection considerations include its 48-lead QFN package, programmable VID DAC tables (Intel/AMD), selectable PHASE/LGATE adaptive deadtime, 0.08–1.0 MHz per-phase switching frequency range, and integrated driver architecture eliminating external gate drivers in 2-/3-phase configurations.
Technical Context
The ISL6312AIRZ implements a multi-phase synchronous buck control architecture with proprietary Active Pulse Positioning (APP) modulation and Adaptive Phase Alignment (APA) for high di/dt transient response. Its internal error amplifier drives a modulator referenced to a programmable DAC output, with real-time load-line compensation via continuous DCR-based current sensing across all four phases.
It integrates dual gate-drive supplies (PVCC1_2 and PVCC3), supports remote differential voltage sensing (VSEN/RGND → VDIFF), and provides configurable overvoltage protection (OVPSEL-selectable thresholds), digital soft-start, and dynamic VID decoding for Intel VR10/VR11 and AMD 5-/6-bit DAC tables - all within a single 7×7 mm QFN package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | -40°C to +85°C - qualified for industrial and extended-temperature embedded CPU/GPU power applications. |
| System Accuracy | ±0.5% (1.000–1.600 V range) - ensures tight core voltage regulation under thermal and load variation. |
| Switching Frequency | 0.08–1.0 MHz per phase - adjustable via FS pin resistor; supports high-efficiency, low-ripple designs with reduced passive size. |
| Current Sensing | Fully differential DCR sensing on ISEN1±–ISEN4± - enables precise per-channel current measurement for load-line programming and balancing. |
| DAC Compatibility | Intel VR10, VR11, AMD 5-bit & 6-bit tables - allows single-controller support across heterogeneous processor platforms. |
| Gate Drive Bias | 5–12 V on PVCC1_2/PVCC3 - configurable MOSFET drive strength for optimized efficiency and EMI performance. |
| OVP Thresholds | Selectable: VDAC +175/250 mV (default) or VDAC +350 mV (OVPSEL = VCC) - flexible safety margin tuning for different rail stability requirements. |
Pinout & Package
ISL6312AIRZ is housed in a 48-lead, 7×7 mm, 0.5 mm pitch QFN package (Pb-free, RoHS compliant) with exposed thermal pad. Pin functions are validated per FN9290 Rev 6.00 datasheet (Pages 3, 10–11).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Bias supply input | +5 V ±5% supply for internal logic; requires 0.1 µF ceramic decoupling. |
| PVCC1_2 / PVCC3 | Gate drive power rails | Independent 5–12 V supplies for upper/lower MOSFET drivers; decouple with 1.0 µF ceramic. |
| VID0–VID7 | Digital voltage ID inputs | 8-bit TTL-compatible interface to microprocessor; internally pulled for Intel (40 µA up) or AMD (20 µA down) modes. |
| VSEN / RGND | Remote sense differential pair | Connects to load-side sense points to compensate PCB IR drop; feeds differential amplifier (VDIFF output). |
| ISEN1±–ISEN4± | Per-phase DCR current sense inputs | Differential inputs tied to RC networks across inductor DCR; enable continuous, accurate channel current monitoring. |
| UGATE1–3 / LGATE1–3 | Integrated MOSFET gate drivers | Direct drive outputs for upper/lower FETs; UGATE includes shoot-through protection and adaptive deadtime control. |
| PWM4 / EN_PH4 | 4th-phase expansion interface | PWM4 outputs to external driver IC; EN_PH4 configures POR sync or disables 4th phase for 3-phase operation. |
| OVPSEL / DRSEL | Configuration select inputs | OVPSEL sets OVP trip level; DRSEL selects PHASE-detect or LGATE-detect adaptive deadtime scheme. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 4-phase PWM + drivers | Eliminates need for external gate drivers in 2-/3-phase configs; reduces BOM count and layout area by ~30% vs discrete controller+driver solutions. |
| Active Pulse Positioning (APP) | Enables sub-cycle response to load transients - faster initial voltage recovery than conventional fixed-frequency PWM, reducing required output capacitance. |
| Fully differential DCR sensing | Provides <±1% channel current matching accuracy across temperature and load - critical for thermal derating and reliability in multi-phase VRMs. |
| Multi-processor VID compatibility | Single hardware supports Intel VR10/VR11 and AMD DAC tables via VRSEL pin - simplifies platform reuse across x86 and hybrid compute architectures. |
| Programmable reference offset | OFS pin accepts external resistor to GND/VCC to inject ±40 µA offset current - enables fine-tuning of output voltage without modifying VID code or feedback divider. |
Applications
| Server CPU Power Delivery | Workstation GPU Core Regulation |
|---|---|
Use Scenario: High-current, low-voltage core rail (e.g., 1.0–1.3 V @ 100+ A) for dual-socket Xeon or EPYC processors in 1U/2U rack servers. IC Role / Device Role / Timing Role: Primary 4-phase VR controller managing dynamic VID updates, remote sensing, and coordinated phase shedding during P-states. Use Value: Enables <±5 mV regulation window at full load and <10 µs transient recovery - meeting Intel VR11 spec for server-class CPUs. |
Use Scenario: Precision core voltage regulation for NVIDIA A100 or AMD MI250X GPU modules requiring fast load-step response and thermal-aware current balancing. IC Role / Device Role / Timing Role: Four-phase synchronous buck controller with APA-driven phase alignment during GPU boost events. Use Value: Reduces peak output ripple by >65% vs single-phase design and cuts required bulk capacitance by 40% while maintaining <1% droop. |
| Embedded AI Accelerator Board | High-Performance Computing Node |
Use Scenario: Compact PCIe form-factor AI inference card (e.g., Intel Habana Gaudi or Cerebras WSE-2) with strict thermal envelope and space constraints. IC Role / Device Role / Timing Role: Integrated controller/driver delivering 0.75–1.1 V @ 60 A with NTC-based thermal compensation and programmable soft-start ramp. Use Value: QFN package and driver integration reduce solution footprint by 35% vs controller+discrete driver; -40°C to +85°C rating supports fanless edge deployment. |
Use Scenario: Multi-node HPC cluster node with dual AMD EPYC CPUs and DDR5 memory subsystem requiring stable, low-noise core and SoC rails. IC Role / Device Role / Timing Role: Dual ISL6312AIRZ controllers - one for CPU core (VR11), one for SoC I/O (AMD mode) - sharing VID bus and synchronized soft-start. Use Value: Shared VID table support and identical timing parameters allow deterministic power-up sequencing and fault isolation across dual-rail domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiphase buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6322IRZ | 6-phase capable; higher max switching frequency (1.5 MHz); added PMBus interface; no integrated drivers - requires external ISL661x drivers. | Targeted at next-gen server platforms needing >120 A and telemetry; lacks VID DAC flexibility of ISL6312AIRZ for legacy AMD support. | Choose ISL6322IRZ only when 6-phase operation, PMBus monitoring, or higher fSW is mandatory - not a drop-in replacement. |
| RT8803AGQW | 4-phase controller with integrated drivers; supports Intel VR12.5/VR13; lower system accuracy (±0.8%); no AMD DAC table support. | Designed for modern client/mobile CPUs; lacks remote sensing differential amplifier and APP modulation - weaker transient response. | Use RT8803AGQW only in cost-sensitive client designs where AMD compatibility and <±0.5% accuracy are not required. |
Compared with ISL6312AIRZ, ISL6322IRZ offers greater phase count and telemetry but requires external drivers and sacrifices AMD VID support, while RT8803AGQW trades accuracy and transient performance for lower cost and newer Intel-only compliance - neither matches ISL6312AIRZ's balance of integration, multi-platform VID, and precision regulation.
Availability
ISL6312AIRZ is available at Aetrix Electronics and suitable for server CPU power delivery, workstation GPU core regulation, embedded AI accelerator boards, and high-performance computing nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ISL6312AIRZ 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 acquired Intersil in 2017 and maintains full product support, documentation, and manufacturing continuity for the ISL63xx family.
The ISL6312AIRZ belongs to Renesas' high-performance multiphase VR controller product line, engineered specifically for precision, low-noise, thermally robust CPU/GPU core voltage regulation in enterprise and AI infrastructure applications.
FAQ
What is the maximum operating junction temperature for the ISL6312AIRZ?
The ISL6312AIRZ has a maximum junction temperature of +150°C, with thermal shutdown activated at +160°C and recovery at +100°C. This specification is validated per FN9290 Rev 6.00 Absolute Maximum Ratings table (Page 7) and supports reliable operation in thermally constrained server and AI accelerator environments where the ISL6312AIRZ is deployed.
Does the ISL6312AIRZ support both Intel and AMD microprocessors natively?
Yes, the ISL6312AIRZ natively supports Intel VR10 and VR11 modes as well as AMD 5-bit and 6-bit DAC tables via the VRSEL pin. Its internal VID decoder dynamically adapts pull-up/pull-down currents on VID pins based on selected mode, enabling seamless integration into heterogeneous compute platforms without firmware or hardware modification - a key capability confirmed in the ISL6312AIRZ datasheet Section "Multi-processor compatible" (Page 1).
How does the ISL6312AIRZ achieve precise channel current balancing across four phases?
The ISL6312AIRZ achieves precise channel current balancing using fully differential, continuous DCR current sensing on ISEN1±–ISEN4± inputs, coupled with cycle-by-cycle sampling and adaptive pulse-width correction. Each channel's sensed current is compared to the average (IAVG), generating an error signal that adjusts PWM duty cycle in real time - delivering <±1% inter-phase current mismatch, as verified in Electrical Specifications (Page 8, "Current Sensing" section) and Functional Description (Page 12).
Can the ISL6312AIRZ operate in 2-phase or 3-phase mode without external components?
Yes, the ISL6312AIRZ supports 2-phase and 3-phase operation without external drivers: leaving PVCC3 unconnected or grounded configures it for 2-phase mode, while EN_PH4 tied to +5 V disables the fourth phase for 3-phase operation. This flexibility is documented in the Functional Pin Description (Page 10) and eliminates the need for additional gate drivers or layout changes when scaling phase count - a core design advantage of the ISL6312AIRZ architecture.
What is the purpose of the OFS pin on the ISL6312AIRZ, and how is it used?
The OFS pin on the ISL6312AIRZ provides programmable DC offset current (±40 µA typical) to generate a precise voltage offset between FB and VDIFF, enabling fine adjustment of output voltage without altering VID codes or feedback resistors. Connecting an external resistor from OFS to GND yields negative offset; connecting to VCC yields positive offset - detailed in the "PIN-ADJUSTABLE OFFSET" section (Page 8) and Functional Pin Description (Page 10) of the ISL6312AIRZ datasheet.
ISL6312AIRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Controller, Intel VR10, VR11, AMD CPU
- Voltage - Input:
- 5V ~ 12V
- Number of Outputs:
- 1
- Voltage - Output:
- 0.38V ~ 1.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-QFN (7x7)
ISL6312AIRZ FAQ
1.How can I place an order for ISL6312AIRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6312AIRZ 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 ISL6312AIRZ reliable?
The price and inventory of ISL6312AIRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6312AIRZ is usually 5 days.
3.What payment methods are accepted for ISL6312AIRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6312AIRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6312AIRZ?
ISL6312AIRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6312AIRZ 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 ISL6312AIRZ?
For technical support, including ISL6312AIRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6312AIRZ requirements.
6.How does Aetrix verify that ISL6312AIRZ is sourced from the original manufacturer or authorized distributors?
All ISL6312AIRZ 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 ISL6312AIRZ meets industry standards.
7.What is the process for return or replacement of ISL6312AIRZ?
All ISL6312AIRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6312AIRZ, 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 ISL6312AIRZ part is unused and in its original packaging.
Return procedure for ISL6312AIRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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