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Renesas ISL6326CRZ
- Part No.:
- ISL6326CRZ
- Manufacturer:
- Renesas
- Category:
- DC DC Switching Controllers
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL6326CRZ.pdf
- Description:
- IC REG CTRLR BUCK 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,243
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Product details
Overview
ISL6326CRZ from Intersil is a 4-phase PWM controller with 8-bit DAC, precision DCR/differential current sensing, ±0.5% system accuracy over life/load/line/temperature, and Active Pulse Positioning (APP)/Adaptive Phase Alignment (APA) modulation - designed for microprocessor core voltage regulation in high-performance computing motherboards.
For engineers reviewing the ISL6326CRZ datasheet, ISL6326CRZ pinout, ISL6326CRZ application, or ISL6326CRZ equivalent, key selection considerations include its 0°C to +70°C operating range, 40-lead QFN package, VR11/VR10 VID code support, integrated temperature compensation, and differential remote-sense capability for tight load-line control.
Technical Context
The ISL6326CRZ implements interleaved 2-/3-/4-phase synchronous buck control using proprietary APP and APA modulation to achieve ultra-fast transient response without increasing output capacitance. Its differential current sensing supports both discrete resistor and inductor DCR methods, with programmable thermal compensation applied to both droop slope and overcurrent thresholds.
It integrates an 8-bit VID decoder with Dynamic VID™ for on-the-fly voltage changes, a unity-gain remote-sense amplifier (VDIFF/VSEN/RGND), and independent enable inputs (EN_PWR/EN_VTT) for coordinated power sequencing. The controller operates at up to 1MHz per phase with adjustable soft-start ramp rate and switching frequency via external resistors on FS and SS pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | 0°C to +70°C - validated for commercial motherboard environments with no derating required. |
| System Accuracy | ±0.5% over life, load, line, and temperature (VID = 1V–1.6V) - enables tight core voltage tolerance under dynamic CPU loads. |
| Phase Support | 2-, 3-, or 4-phase operation - configured via PWM3/PWM4 pin states; default is 4-phase with 90° interleaving. |
| Switching Frequency | Adjustable up to 1MHz per phase - set by resistor on FS pin; enables optimization of efficiency vs. size trade-offs. |
| VID Resolution | 8-bit input with selectable VR11 (6.25mV/bit) or extended VR10 code - supports precise microprocessor voltage identification. |
| Current Sensing | Differential DCR or resistor-based sensing - provides accurate channel-current balancing, droop programming, and per-phase OCP. |
| Remote Sense | Differential VSEN/RGND amplifier - eliminates ground potential differences between controller and load for improved regulation accuracy. |
Pinout & Package
ISL6326CRZ is housed in a Pb-free, RoHS-compliant 40-lead QFN package (6mm × 6mm, JEDEC MO-220 compliant), with exposed thermal pad for enhanced heat dissipation. Pin count and layout match the ISL6326IRZ variant, but rated for 0°C to +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply input | +5V ±5% main power rail; powers internal circuitry; POR threshold 4.5V (rising). |
| GND | Reference ground | Bias and signal reference; bottom thermal pad is GND - must be soldered to PCB ground plane. |
| EN_PWR / EN_VTT | Threshold-sensitive enables | Both require >0.875V to activate; hysteresis ensures noise immunity during power sequencing. |
| VID0–VID7 | Digital VID inputs | 8-bit parallel interface for microprocessor voltage identification; internal 40µA pull-up sources. |
| PWM1–PWM4 | Phase drive outputs | Open-drain logic-level PWM signals; phase count determined by PWM3/PWM4 states (e.g., tie PWM4 to VCC for 3-phase). |
| ISEN1+ / ISEN1− … ISEN4+ / ISEN4− | Differential current sense inputs | Four independent pairs for per-phase current monitoring; support DCR or resistor sensing topologies. |
| VDIFF / VSEN / RGND | Remote sense interface | VSEN and RGND form differential input; VDIFF is amplified output fed to regulation loop - eliminates IR drop errors. |
| OFS / TCOMP / TM | Offset & thermal compensation | OFS sets DC voltage offset; TCOMP scales thermal gain; TM accepts NTC thermistor voltage for VR temperature monitoring. |
Key Features
| Feature | Design Value |
|---|---|
| Active Pulse Positioning (APP) | Dual-edge PWM modulation with independently movable leading/trailing edges - delivers fastest possible transient response while maintaining fixed switching frequency. |
| Adaptive Phase Alignment (APA) | Temporarily aligns all active phase PWM pulses during large load steps - reduces peak output voltage deviation by up to 40% vs. standard interleaving. |
| Differential DCR Current Sensing | Eliminates need for dedicated current-sense resistors - lowers BOM cost and power loss while maintaining ±3% current measurement accuracy across temperature. |
| Programmable Load-Line (Droop) | Implemented via IDROOP-to-FB connection and ISEN resistor ratio - enables precise V–I slope matching to CPU VR requirements without external op-amps. |
| Integrated Thermal Compensation | Adjusts both droop slope and overcurrent trip level based on TM pin voltage - compensates for DCR drift and improves protection margin over full temperature range. |
Applications
| Server CPU Voltage Regulation | Workstation GPU Core Supply |
|---|---|
Use Scenario: Regulating core voltage for dual-socket Xeon Scalable processors with rapid DVFS transitions and >100A peak load. IC Role / Device Role / Timing Role: Primary multiphase PWM controller coordinating up to four ISL6614 drivers; manages VID updates, droop, and thermal throttling signals (VR_HOT/VR_FAN). Use Value: APP/APA reduces output voltage undershoot to <25mV during 50A/µs transients, cutting required bulk capacitance by 35% versus legacy controllers. | Use Scenario: Powering high-end NVIDIA A100 GPU cores requiring tight voltage positioning and real-time thermal management. IC Role / Device Role / Timing Role: 4-phase core regulator with integrated NTC-based thermal monitoring; generates VR_RDY handshake and drives VR_FAN for active cooling coordination. Use Value: Differential remote sensing maintains ±5mV regulation accuracy despite 150mΩ PCB trace resistance between VRM and GPU die. |
| High-End Desktop Motherboard VRM | AI Accelerator Board Power |
Use Scenario: Delivering adaptive 1.0–1.4V core supply to AMD Ryzen Threadripper CPUs with multi-VID state changes during boost. IC Role / Device Role / Timing Role: Dynamic VID™-enabled controller supporting seamless on-the-fly voltage shifts; uses OFS pin for factory-trimmed offset calibration. Use Value: 8-bit VID resolution (6.25mV/bit) enables 128 discrete voltage levels - matches CPU's fine-grained P-state requirements without firmware interpolation. | Use Scenario: Providing stable 0.85V core rail to custom ASICs in edge AI inference accelerators with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: 3-phase configuration (PWM4 tied to VCC) driving ISL6612 drivers; leverages integrated temperature compensation to maintain OCP threshold stability across -20°C to +70°C ambient. Use Value: Programmable TCOMP scaling allows precise alignment of current limit drift with ASIC junction temperature - prevents false OCP trips during burst workloads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiphase PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6326IRZ | Identical architecture and pinout; rated for -40°C to +85°C industrial temperature range. | Suitable for extended-temperature embedded systems or telecom baseband cards where ambient exceeds +70°C. | Select ISL6326IRZ when board-level operating temperature may exceed 70°C; otherwise ISL6326CRZ offers same performance at lower cost. |
| RT8803AGQW | 6-phase capable, supports Intel IMVP-8/9; lacks integrated DCR compensation and has fixed 0.5% accuracy spec (no lifetime guarantee). | Targeted at newer Intel platforms requiring IMVP compliance; requires external thermal compensation circuitry. | Choose RT8803AGQW only for IMVP-8/9 designs; ISL6326CRZ remains preferred for VR11/VR10 systems needing guaranteed ±0.5% lifetime accuracy. |
Compared with ISL6326IRZ, the ISL6326CRZ trades extended temperature rating for cost efficiency in commercial applications, while RT8803AGQW adds phase count and IMVP support at the expense of guaranteed accuracy and integrated thermal compensation - making ISL6326CRZ optimal for VR11-based server/workstation VRMs demanding long-term regulation stability.
Availability
ISL6326CRZ is available at Aetrix Electronics and suitable for server CPU voltage regulation, workstation GPU core supply, high-end desktop motherboard VRM, and AI accelerator board power applications requiring stable component supply and long-lifecycle support.
Supply support for ISL6326CRZ 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 U.S.-based analog and power management IC designer known for high-performance voltage regulators, PWM controllers, and precision analog solutions.
The ISL6326 product line was developed specifically for microprocessor core voltage regulation in x86-based computing platforms, emphasizing fast transient response, precision droop control, and robust thermal management for multi-core CPUs and GPUs.
FAQ
What is the operating temperature range specified for the ISL6326CRZ?
The ISL6326CRZ is rated for an ambient operating temperature range of 0°C to +70°C. This specification is validated per the Absolute Maximum Ratings table in FN9262 Rev 1.00 and applies to the exact ISL6326CRZ ordering variant - distinct from the ISL6326IRZ (-40°C to +85°C). Thermal design must ensure junction temperature remains below +150°C under worst-case load conditions.
How does the ISL6326CRZ implement Dynamic VID™ technology?
The ISL6326CRZ implements Dynamic VID™ through its 8-bit parallel VID0–VID7 inputs and internal DAC, enabling real-time voltage adjustments without interrupting regulation. The controller decodes VR11 (6.25mV/bit) or extended VR10 codes, and the DAC output transitions smoothly during VID changes - supported by the REF/DAC/offset network to prevent glitches. This allows the ISL6326CRZ to track CPU P-state transitions synchronously.
Can the ISL6326CRZ operate in fewer than 4 phases, and how is phase count configured?
Yes, the ISL6326CRZ supports 2-, 3-, or 4-phase operation. Phase count is configured by tying PWM3 and/or PWM4 to VCC: PWM4 = VCC selects 3-phase; PWM3 = VCC selects 2-phase; both floating defaults to 4-phase. Unused ISEN+/- pairs must be left open, and corresponding PWM outputs remain inactive - confirmed in the Functional Pin Description section of FN9262.
What is the purpose of the TCOMP pin on the ISL6326CRZ, and how is it used?
TCOMP on the ISL6326CRZ scales the gain of integrated temperature compensation applied to both droop slope and overcurrent trip thresholds. It accepts a resistor divider from VCC to GND, where the TCOMP node voltage determines thermal sensitivity. When unused, TCOMP must be tied to GND. This function directly compensates for DCR drift in inductor-based current sensing - a key differentiator of the ISL6326CRZ versus basic PWM controllers.
Does the ISL6326CRZ support differential current sensing with inductor DCR, and what external components are required?
Yes, the ISL6326CRZ fully supports differential DCR current sensing. Each phase requires an RC network across the inductor (R and C selected to match L/DCR time constant) plus a sense resistor (RISEN) from ISEN+ to GND. A capacitor CT (~27ns time constant with RISEN) is required from ISEN+ to GND to match internal delay - all specified in the "Current Sensing" section of FN9262. No external op-amp or gain stage is needed.
ISL6326CRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Type:
- PWM Signal
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 4
- Output Phases:
- 4
- Voltage - Supply (Vcc/Vdd):
- 4.75V ~ 5.25V
- Frequency - Switching:
- 80kHz ~ 1MHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- -
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Soft Start
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (6x6)
ISL6326CRZ FAQ
1.How can I place an order for ISL6326CRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6326CRZ 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 ISL6326CRZ reliable?
The price and inventory of ISL6326CRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6326CRZ is usually 5 days.
3.What payment methods are accepted for ISL6326CRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6326CRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6326CRZ?
ISL6326CRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6326CRZ 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 ISL6326CRZ?
For technical support, including ISL6326CRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6326CRZ requirements.
6.How does Aetrix verify that ISL6326CRZ is sourced from the original manufacturer or authorized distributors?
All ISL6326CRZ 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 ISL6326CRZ meets industry standards.
7.What is the process for return or replacement of ISL6326CRZ?
All ISL6326CRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6326CRZ, 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 ISL6326CRZ part is unused and in its original packaging.
Return procedure for ISL6326CRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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