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Renesas ISL6312ACRZ
- Part No.:
- ISL6312ACRZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ISL6312ACRZ.pdf
- Description:
- IC REG CTRLR VR10 1OUT 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,424
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Product details
Overview
ISL6312ACRZ 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 supports 2-, 3-, or 4-phase operation, delivers ±0.5% system accuracy over temperature, features fully differential DCR current sensing, and operates across 0°C to +70°C ambient range in a 48-lead QFN package.
For engineers reviewing the ISL6312ACRZ datasheet, ISL6312ACRZ pinout, ISL6312ACRZ application, or ISL6312ACRZ equivalent, key selection considerations include its multi-processor VID compatibility (Intel VR10/VR11 and AMD DAC tables), active pulse positioning (APP) modulation for high di/dt transient response, selectable PHASE/LGATE detect adaptive deadtime, 48-pin 7×7 mm QFN package, and integrated gate drivers eliminating external driver ICs.
Technical Context
The ISL6312ACRZ implements a four-phase interleaved buck architecture with integrated high- and low-side gate drivers per phase (PHASE1–PHASE3, UGATE1–UGATE3, LGATE1–LGATE3), plus PWM4 output for external fourth-phase driver control. Its control loop uses a unity-gain differential remote-sense amplifier (VSEN/RGND → VDIFF), programmable reference offset (OFS), and continuous DCR-based current sensing across all four channels (ISEN1± to ISEN4±) for load-line programming and channel balancing.
It supports dual-mode operation via VRSEL: Intel VR10/VR11 (8-bit VID with extended tables) or AMD (5-/6-bit DAC), with dynamic VID capability. Protection includes multi-tiered OVP (configurable via OVPSEL), UVLO (60% VID threshold), overcurrent detection per channel and average (125 µA typical trip), open-sense fault prevention, and thermal shutdown at 160°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | 0°C to +70°C - Validated for commercial-temperature server/desktop CPU VR applications. |
| Switching Frequency | Up to 1.5 MHz per phase - Enables compact magnetics and high transient bandwidth. |
| System Accuracy | ±0.5% (1.0–1.6 V range) - Ensures tight core voltage regulation under load and thermal variation. |
| Current Sensing | Fully differential DCR sensing on all 4 phases - Enables precise per-channel current balance and load-line slope control without sense resistors. |
| VID Compatibility | Intel VR10, VR11, and AMD 5-/6-bit DAC tables - Single controller supports heterogeneous CPU platforms. |
| Gate Drive Bias | 5 V to 12 V (PVCC1_2, PVCC3) - Configurable drive strength for optimal FET switching efficiency and EMI control. |
| OVP Threshold | Selectable: VDAC + 175 mV (default) or VDAC + 350 mV (OVPSEL = VCC) - Adjustable protection margin for varying system tolerances. |
Pinout & Package
ISL6312ACRZ is housed in a 48-lead, 7 mm × 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 (pp. 3, 10–11).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Bias supply input | +5 V ±5% supply for internal logic and error amplifier; requires 0.1 µF ceramic decoupling. |
| PVCC1_2 / PVCC3 | Gate drive power rails | Independent 5–12 V supplies for phase 1/2 and phase 3 drivers; decouple with 1.0 µF ceramic each. |
| VID0–VID7 | Digital voltage identification inputs | 8-bit TTL-compatible inputs decoded per VRSEL-selected DAC table (Intel/AMD); internally biased. |
| VSEN / RGND | Remote voltage sense inputs | Differential pair connected to CPU VDD/VSS sense points; enables accurate load-point regulation. |
| ISEN1±–ISEN4± | Per-phase DCR current sense inputs | Fully differential inputs tied to RC networks across inductor DCR; enable channel balancing and OCP. |
| UGATE1–UGATE3 / LGATE1–LGATE3 | Integrated gate drive outputs | Direct drive outputs for upper/lower MOSFET gates of phases 1–3; include shoot-through protection. |
| PWM4 | External phase 4 PWM output | Drives external driver (e.g., ISL6612) for full 4-phase operation; synchronized and balanced by controller. |
| EN / EN_PH4 | Enable and phase 4 enable control | EN enables entire controller (~0.85 V threshold); EN_PH4 selects 3- vs 4-phase mode or enables external POR sync. |
Key Features
| Feature | Design Value |
|---|---|
| Active Pulse Positioning (APP) | Enables sub-cycle PWM edge placement for immediate response to high di/dt load steps-reducing output voltage droop without increasing capacitor count. |
| Adaptive Phase Alignment (APA) | Temporarily aligns all phase PWM edges during large load transients-maximizing instantaneous current delivery and minimizing peak undershoot. |
| Programmable reference offset (OFS) | Supports ±100 mV DC offset via single external resistor-enables fine-tuning of output voltage for margining or board-level IR drop compensation. |
| Selectable adaptive deadtime | PHASE-detect (DRSEL = GND) or LGATE-detect (DRSEL = VCC via 50 kΩ) - Optimizes timing for different MOSFET gate charge characteristics and layout parasitics. |
| Digital soft-start | Configurable ramp rate (0.625–6.25 mV/µs) via SS resistor or preset for AMD - Prevents inrush current and ensures controlled power-up sequencing. |
Applications
| Server CPU Power Delivery | Desktop Processor VRM |
|---|---|
Use Scenario: Regulating core voltage for dual-socket Xeon or EPYC processors with dynamic load steps exceeding 100 A/µs. IC Role / Device Role / Timing Role: Four-phase PWM controller managing synchronous buck stages with integrated drivers, remote sensing, and DCR current monitoring. Use Value: APP+APA reduces peak undershoot to <15 mV and cuts required bulk capacitance by ~35% versus conventional controllers. |
Use Scenario: High-efficiency 12 V input to 0.8–1.4 V core voltage conversion for Intel Core i7/i9 or AMD Ryzen CPUs on ATX motherboards. IC Role / Device Role / Timing Role: Primary VR controller supporting both Intel VR11 and AMD modes via VRSEL, with programmable OVP and VID offset. Use Value: Single-footprint compatibility across CPU generations eliminates BOM proliferation and simplifies platform bring-up. |
| Laptop CPU Voltage Regulator | Workstation GPU Core Supply |
Use Scenario: Compact, thermally constrained core rail for mobile CPUs requiring tight regulation and fast transient recovery. IC Role / Device Role / Timing Role: Three-phase controller (PVCC3 unconnected) with differential remote sensing and thermal shutdown at 160°C. Use Value: ±0.5% system accuracy over 0–70°C ensures stable operation across fanless and throttled thermal profiles. |
Use Scenario: High-current GPU core supply (e.g., NVIDIA RTX or AMD Radeon) demanding precise load-line control and channel current balance. IC Role / Device Role / Timing Role: Four-phase controller using DCR sensing on all phases to enforce <±2% inter-channel current mismatch at full load. Use Value: Continuous per-cycle current sampling prevents thermal runaway in paralleled power stages and extends MOSFET lifetime. |
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 | Same 48-pin QFN package; adds digital interface (SMBus/PMBus), telemetry reporting, and enhanced thermal management; supports VR12.5/IMVP7. | Required for systems needing real-time voltage/current/temperature telemetry or dynamic configuration via host processor. | Choose ISL6322IRZ when digital control, fault logging, or IMVP7 compliance is mandatory; not pin-compatible due to different register map and SMBus pins. |
| RT8803AZSP | 4-phase controller with integrated drivers; supports Intel VR12.5 only; lacks AMD DAC support and differential remote sensing (single-ended FB). | Suitable for cost-sensitive Intel-only platforms where AMD compatibility and remote sensing are unnecessary. | Choose RT8803AZSP for Intel VR12.5 desktop boards with simpler layout; requires redesign for remote sensing and VID table flexibility. |
Compared with ISL6312ACRZ, ISL6322IRZ adds digital configurability but increases complexity and cost, while RT8803AZSP reduces feature set and platform flexibility-making ISL6312ACRZ optimal for analog-controlled, dual-architecture CPU VRMs requiring proven reliability and minimal external components.
Availability
ISL6312ACRZ is available at Aetrix Electronics and suitable for server motherboard design, desktop VRM development, and embedded computing platforms requiring stable component supply, long-lifecycle availability, and commercial-temperature grade performance.
Supply support for ISL6312ACRZ 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 acquired Intersil in 2017 and maintains full product support, documentation, and manufacturing continuity for the ISL63xx family.
The ISL6312ACRZ belongs to Renesas' high-performance multiphase buck controller product line, engineered specifically for microprocessor core voltage regulation in servers, desktops, and workstations with emphasis on transient response, multi-platform compatibility, and integration density.
FAQ
What is the operating temperature range specified for the ISL6312ACRZ?
The ISL6312ACRZ is rated for 0°C to +70°C ambient operation, as confirmed in the Ordering Information table (page 2) and Recommended Operating Conditions (page 7) of FN9290 Rev 6.00. This commercial-grade specification aligns with standard desktop and entry-server CPU VRM requirements. The device incorporates thermal shutdown at 160°C junction temperature and recovers at 100°C, ensuring robustness within its rated ambient envelope. ISL6312ACRZ must be mounted with proper thermal pad soldering to meet θJC = 2°C/W.
Does the ISL6312ACRZ support both Intel and AMD microprocessor voltage identification protocols?
Yes, the ISL6312ACRZ natively supports Intel VR10 and VR11 modes as well as AMD 5-bit and 6-bit DAC tables, selected via the VRSEL pin. VID0–VID7 inputs accept TTL logic levels and are internally biased for each mode-pull-up for Intel (40 µA) and pull-down for AMD (20 µA). Dynamic VID is implemented, allowing real-time voltage changes during operation. This dual-protocol capability is explicitly documented in the Features list (page 1) and Functional Pin Description (page 10) of the ISL6312ACRZ datasheet.
How does the ISL6312ACRZ achieve four-phase operation given it has only three integrated gate drivers?
The ISL6312ACRZ provides three integrated gate driver pairs (UGATE1/LGATE1 through UGATE3/LGATE3) and one dedicated PWM output (PWM4) to control an external driver IC-such as the ISL6612-for the fourth phase. This architecture is confirmed in the title ("Four-Phase Buck PWM Controller with Integrated MOSFET Drivers") and Figure 5 (page 5) of FN9290. PWM4 is fully synchronized and balanced with the internal phases, enabling true four-phase interleaving without sacrificing channel-current balance or transient response. ISL6312ACRZ thus delivers full 4-phase functionality while minimizing component count.
What protection features are built into the ISL6312ACRZ?
The ISL6312ACRZ integrates overvoltage protection (OVP) with dual thresholds (VDAC + 175 mV default or +350 mV via OVPSEL), undervoltage lockout (UVLO at 60% VID), per-channel and average overcurrent protection (125 µA typical trip), open-sense input fault detection, thermal shutdown (160°C), and shoot-through prevention. These are detailed in the "Protection features" paragraph (page 1), Absolute Maximum Ratings (page 7), and Electrical Specifications (pages 8–9). All protections drive PGOOD low and initiate soft-stop behavior-ensuring safe, repeatable recovery without latch-up. ISL6312ACRZ implements these without external comparators or timers.
Can the ISL6312ACRZ be configured for fewer than four phases?
Yes, the ISL6312ACRZ supports 2-phase and 3-phase operation. Leaving PVCC3 unconnected or grounded disables phase 3 and configures the controller for 2-phase mode. For 3-phase operation, PVCC3 is powered and PWM4 is disabled by pulling EN_PH4 to VCC. This flexibility is stated in the Features list ("2-phase or 3-phase operation with internal drivers; 4-phase operation with external PWM driver signal") and confirmed in the Functional Pin Description for EN_PH4 (page 11). No hardware modification beyond PVCC3 and EN_PH4 connection is required-ISL6312ACRZ automatically adapts phase count and current balancing accordingly.
ISL6312ACRZ 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-QFN (7x7)
ISL6312ACRZ FAQ
1.How can I place an order for ISL6312ACRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6312ACRZ 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 ISL6312ACRZ reliable?
The price and inventory of ISL6312ACRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6312ACRZ is usually 5 days.
3.What payment methods are accepted for ISL6312ACRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6312ACRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6312ACRZ?
ISL6312ACRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6312ACRZ 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 ISL6312ACRZ?
For technical support, including ISL6312ACRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6312ACRZ requirements.
6.How does Aetrix verify that ISL6312ACRZ is sourced from the original manufacturer or authorized distributors?
All ISL6312ACRZ 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 ISL6312ACRZ meets industry standards.
7.What is the process for return or replacement of ISL6312ACRZ?
All ISL6312ACRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6312ACRZ, 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 ISL6312ACRZ part is unused and in its original packaging.
Return procedure for ISL6312ACRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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