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Renesas ISL6312IRZ-T
- Part No.:
- ISL6312IRZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ISL6312IRZ-T.pdf
- Description:
- IC REG CTRLR VR10 1OUT 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,137
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Product details
Overview
ISL6312IRZ-T from Renesas (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 delivers ±0.5% system accuracy over temperature, supports up to 1.5MHz per-phase switching, and implements Active Pulse Positioning (APP) modulation for high di/dt transient response in server and desktop CPU VRMs.
For engineers reviewing the ISL6312IRZ-T datasheet, ISL6312IRZ-T pinout, ISL6312IRZ-T application, or ISL6312IRZ-T equivalent, key selection considerations include its 48-pin QFN package, -40°C to +85°C industrial temperature range, differential remote sensing, fully differential DCR current sensing, and dual adaptive dead time (PHASE/LGATE detect) support.
Technical Context
The ISL6312IRZ-T integrates four-phase PWM control logic, on-die gate drivers (UGATE/LGATE outputs), and a programmable VID DAC supporting Intel VR10/VR11 and AMD 5-/6-bit tables. Its control architecture includes a unity-gain differential remote-sense amplifier (VSEN/RGND → VDIFF), continuous DCR-based current sensing across all four channels, and APP-modulated PWM with Adaptive Phase Alignment (APA) for load-step enhancement.
It features dual-mode adaptive dead time selection (via DRSEL), selectable OVP thresholds (OVPSEL), offset programming via OFS pin, and digital soft-start with VID-mode–dependent ramp rates. The controller operates with PVCC bias from 5V to 12V and supports 2-, 3-, or 4-phase configurations - with external PWM driver required for full 4-phase operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | -40°C to +85°C - qualified for industrial-grade CPU VRM deployment with thermal shutdown at 160°C. |
| Switching Frequency | Up to 1.5 MHz per phase - enables compact magnetics and high-density PCB layout in modern VRMs. |
| System Accuracy | ±0.5% over temp (1.0–1.6V range) - ensures tight core voltage regulation under dynamic CPU load conditions. |
| Current Sensing | Fully differential, continuous DCR sensing - enables precise channel current balancing and accurate load-line programming. |
| VID Compatibility | Intel VR10/VR11 + AMD 5-/6-bit DAC tables - single controller supports multi-platform motherboard designs. |
| Gate Drive Bias | 5V–12V PVCC range - configurable upper/lower drive strength for optimal MOSFET switching efficiency and EMI control. |
| Remote Sensing | Differential VSEN/RGND inputs with VDIFF output - compensates for PCB IR drop to maintain true load-point regulation. |
Pinout & Package
ISL6312IRZ-T is housed in a 48-lead, 7mm × 7mm, 0.5mm pitch QFN package with exposed thermal pad (PKG DWG # L48.7x7). Pin functions are validated per FN9289 Rev 6.00 datasheet, Page 2 (top view) and Page 9 (functional descriptions).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Bias supply input | +5V ±5% supply for internal logic; requires 0.1µF ceramic decoupling. |
| PVCC1_2 / PVCC3 | Gate drive power rails | Independent 5–12V supplies for channel 1/2 and channel 3 drivers; unconnected PVCC3 configures 2-phase mode. |
| VID0–VID7 | DAC reference inputs | 8-bit TTL-compatible inputs for VR10/VR11/AMD voltage identification codes. |
| VSEN / RGND | Remote sense inputs | Differential pair connected to CPU VDD/VSS sense points; rejects ground noise and trace resistance error. |
| ISEN1±–ISEN4± | Channel current sense | Four fully differential inputs for DCR-based inductor current monitoring per phase. |
| UGATE1–UGATE3 / LGATE1–LGATE3 | Integrated gate drivers | Direct-drive outputs for upper/lower MOSFETs of phases 1–3; PWM4 required for phase 4. |
| EN / EN_PH4 | Enable controls | EN enables full controller; EN_PH4 synchronizes external driver POR or disables PWM4 for 3-phase operation. |
| OVPSEL / DRSEL / OFS | Configuration terminals | OVPSEL selects overvoltage threshold; DRSEL chooses PHASE/LGATE dead-time detection; OFS programs voltage offset. |
Key Features
| Feature | Design Value |
|---|---|
| Active Pulse Positioning (APP) | Enables sub-cycle PWM edge placement for <100ns response to high di/dt load transients without ringing. |
| Adaptive Phase Alignment (APA) | Forces simultaneous phase activation during large load steps, reducing peak output voltage deviation by >40% vs. interleaved-only control. |
| Differential DCR current sensing | Eliminates need for discrete current-sense resistors; achieves <±2% channel current mismatch across full load range. |
| User-selectable dead time scheme | DRSEL pin selects PHASE-detect (for low-side FET VDS monitoring) or LGATE-detect (for gate-voltage timing) - matches diverse MOSFET layouts. |
| Programmable voltage offset | OFS pin sinks or sources precision current (40µA/53.5µA) through external resistor to generate ±10–50mV DC offset for droop or margining. |
Applications
| Server CPU Power Delivery | Desktop Platform VRM |
|---|---|
Use Scenario: High-current, multi-core Xeon or EPYC processor power stage delivering 100–300A at 0.8–1.3V with strict transient response requirements. IC Role / Device Role / Timing Role: Primary 4-phase PWM controller managing gate drive, current balance, VID decoding, and protection for CPU core rail. Use Value: APP+APA reduces output voltage undershoot to <35mV during 50A/µs load steps, minimizing need for bulk ceramic capacitance. |
Use Scenario: ATX motherboard VRM supplying Intel Core i7/i9 or AMD Ryzen CPU with dynamic VID scaling and thermal throttling. IC Role / Device Role / Timing Role: Integrated controller providing VR11/AMD DAC compatibility, remote sensing, and digital soft-start sequencing. Use Value: ±0.5% system accuracy ensures stable operation across -40°C to +85°C ambient, meeting Intel VR11 spec for desktop platforms. |
| Workstation GPU Core Rail | Industrial Embedded CPU Module |
Use Scenario: High-performance GPU power delivery requiring fast transient response and multi-rail coordination (e.g., PCIe Gen5 graphics cards). IC Role / Device Role / Timing Role: Four-phase controller driving discrete MOSFETs with independent PVCC biasing for optimized gate drive efficiency. Use Value: Fully differential DCR sensing maintains <±1.5% channel current imbalance at 200A total load, preventing thermal hotspots. |
Use Scenario: Fanless embedded system using AMD Ryzen Embedded V1000 series with extended temperature operation and long lifecycle requirements. IC Role / Device Role / Timing Role: Industrial-grade VRM controller supporting AMD 6-bit DAC, thermal shutdown at 160°C, and Pb-free reflow compliance. Use Value: -40°C to +85°C operating range and RoHS-compliant packaging ensure reliability in sealed, convection-cooled enclosures. |
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-T | Successor IC with enhanced VR12.5/IMVP7 support, higher 2MHz max frequency, and improved current-sense accuracy (±0.75% vs. ±1%). No pin-to-pin compatibility. | Targets next-gen mobile and ultra-thin platforms requiring tighter voltage tolerance and faster VID transitions. | Select ISL6322IRZ-T only when upgrading to IMVP7/VR12.5 compliance; ISL6312IRZ-T remains optimal for VR10/VR11/AMD legacy designs. |
| RT8803AZSP | 3-phase controller with integrated drivers; lacks 4-phase native support, VID table flexibility (VR10/VR11/AMD), and APP modulation. | Suitable for cost-sensitive mainstream desktop boards where 3-phase suffices and VR11/AMD co-support is not required. | Choose RT8803AZSP for simplified 3-phase designs; ISL6312IRZ-T is required for 4-phase, multi-platform, or APP-enhanced transient performance. |
Compared with ISL6322IRZ-T, the ISL6312IRZ-T offers broader legacy VID compatibility and proven stability in high-volume VR10/VR11 deployments; versus RT8803AZSP, it provides superior phase count, transient response, and configurability - making it the preferred choice for demanding 4-phase CPU VRMs.
Availability
ISL6312IRZ-T is available at Aetrix Electronics and suitable for server CPU power delivery, desktop platform VRMs, workstation GPU core rails, and industrial embedded CPU modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ISL6312IRZ-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 acquired Intersil in 2017 and maintains full technical and supply chain support for legacy Intersil power management ICs including the ISL63xx family.
The ISL6312IRZ-T belongs to Intersil's high-performance multiphase buck controller product line, engineered specifically for precision, multi-processor-compatible CPU voltage regulation in computing and data center applications.
FAQ
What is the maximum supported switching frequency for ISL6312IRZ-T?
The ISL6312IRZ-T supports an adjustable switching frequency up to 1.5MHz per phase, set via an external resistor on the FS pin. This high-frequency capability allows designers to reduce inductor size and output capacitance while maintaining excellent transient response in CPU VRMs. The oscillator accuracy is ±10% over temperature, and typical ramp amplitude is 1.5V peak-to-peak.
Does ISL6312IRZ-T support both Intel and AMD microprocessors?
Yes, the ISL6312IRZ-T natively supports Intel VR10 and VR11 modes as well as AMD 5-bit and 6-bit DAC tables. The VRSEL pin selects the active VID decoding table, and internal pull-up/pull-down current sources automatically adapt to the selected standard. This dual-processor compatibility eliminates the need for separate motherboard designs targeting different CPU families.
How does ISL6312IRZ-T achieve precise current balancing across phases?
The ISL6312IRZ-T uses fully differential, continuous DCR current sensing on all four channels (ISEN1±–ISEN4±) to sample inductor current each switching cycle. It computes a real-time cycle-average current (IAVG) and adjusts individual PWM pulse widths to force channel currents within ±1.5% mismatch. This method avoids discrete sense resistors and maintains balance across temperature and load.
What is the purpose of the OFS pin on ISL6312IRZ-T?
The OFS pin on ISL6312IRZ-T provides programmable DC offset for the feedback loop: connecting an external resistor to GND generates negative offset (e.g., for voltage droop), while connecting to VCC yields positive offset (e.g., for margining tests). Internal current sources deliver 40µA (sink) or 53.5µA (source) with ±3% accuracy, enabling precise ±10–50mV adjustments without additional op-amps.
Can ISL6312IRZ-T operate in 2-phase or 3-phase mode?
Yes, the ISL6312IRZ-T supports flexible phase configuration: leaving PVCC3 unconnected or grounded configures 2-phase operation; using only UGATE1/LGATE1 and UGATE2/LGATE2 with EN_PH4 tied high enables 3-phase mode; full 4-phase requires PWM4 connection to an external driver like ISL6612. All modes retain APP modulation, DCR sensing, and VID compatibility.
ISL6312IRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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)
ISL6312IRZ-T FAQ
1.How can I place an order for ISL6312IRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6312IRZ-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 ISL6312IRZ-T reliable?
The price and inventory of ISL6312IRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6312IRZ-T is usually 5 days.
3.What payment methods are accepted for ISL6312IRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6312IRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6312IRZ-T?
ISL6312IRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6312IRZ-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 ISL6312IRZ-T?
For technical support, including ISL6312IRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6312IRZ-T requirements.
6.How does Aetrix verify that ISL6312IRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6312IRZ-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 ISL6312IRZ-T meets industry standards.
7.What is the process for return or replacement of ISL6312IRZ-T?
All ISL6312IRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6312IRZ-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 ISL6312IRZ-T part is unused and in its original packaging.
Return procedure for ISL6312IRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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