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Renesas ISL6566CRZ-T
- Part No.:
- ISL6566CRZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL6566CRZ-T.pdf
- Description:
- IC CTLR PWM BUCK 3PHASE 40-QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,876
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Product details
Overview
ISL6566CRZ-T from Renesas (formerly Intersil) is a three-phase buck PWM controller with integrated high- and low-side MOSFET drivers, designed for precision core voltage regulation in Intel VRM9/VRM10 and AMD Hammer microprocessor power delivery. It supports 1–3-phase operation, delivers ±0.5% system accuracy over temperature, uses dual DCR/rDS(ON) current sensing for droop control and channel balancing, and operates up to 1.5 MHz per phase in server and workstation CPU VRMs.
For engineers reviewing the ISL6566CRZ-T datasheet, ISL6566CRZ-T pinout, ISL6566CRZ-T application, or ISL6566CRZ-T equivalent, key selection criteria include its integrated gate drivers, programmable VID decoding (VRM9/VRM10/AMD), differential remote sensing, lossless DCR-based load line programming, and multi-tier overvoltage/overcurrent protection - all in a Pb-free 40-lead 6×6 mm QFN package.
Technical Context
The ISL6566CRZ-T implements interleaved three-phase PWM control with adaptive non-overlap timing, internal sawtooth oscillator (225–275 kHz base, scalable to 1.5 MHz), and independent channel enable via PVCCx pin states. Its error amplifier features 96 dB DC gain and 20 MHz GBW for tight transient response in high-dI/dt CPU loads.
Current sensing combines rDS(ON) sampling on ISEN1–ISEN3 for real-time per-channel balance and DCR-based ISUM/IREF/ICOMP summation for accurate load-line droop and overcurrent detection. Protection includes clamping overvoltage response, ENLL-enabled soft-start, and open-sense-line detection via VDIFF threshold monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Three-phase synchronous buck PWM controller with integrated high/low-side gate drivers |
| VID Compatibility | Programmable for Intel VRM9.0, VRM10.0, and AMD Hammer DAC codes via VRM10/VID12.5 pins |
| System Accuracy | ±0.5% over temperature (VID = 1.0–1.85 V); ±0.8% (VID = 0.8–1.0 V) |
| Current Sensing | Dual-method: lossless DCR (ISUM/IREF/ICOMP) for droop & OCP; rDS(ON) (ISEN1–3) for per-channel balance |
| Switching Frequency | 225–275 kHz base (RT-set), scalable to 1.5 MHz per phase via external resistor and internal multiplier |
| Package | 40-lead 6×6 mm QFN (Pb-free, RoHS-compliant, θJA = 32°C/W) |
| Operating Temp | 0°C to +70°C ambient (ISL6566CRZ-T grade) |
| Protection Features | Multi-tier OVP (clamping mode), UVP, OCSET-based overcurrent, open-sense-line detection, thermal shutdown (160°C) |
Pinout & Package
ISL6566CRZ-T is housed in a 40-lead, 6 mm × 6 mm, 0.5 mm pitch QFN package with exposed thermal pad. Pin functions are validated per FN9178 Rev 4.00 datasheet (pages 2, 8–9).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VID0–VID4, VID12.5 | Voltage ID input | 5–6-bit digital interface for microprocessor core voltage setting; TTL-compatible with internal 40 µA pull-ups |
| UGATE1–3, LGATE1–3 | MOSFET gate drive outputs | Integrated drivers support 5–12 V gate bias; UGATE includes adaptive shoot-through prevention |
| ISEN1–3 | Channel current sense inputs | Accept rDS(ON)-based current signals for per-phase balancing; sampled during forced-off time |
| ISUM, IREF, ICOMP | DCR current summation network | Enable lossless load-line droop and overcurrent protection using inductor DCR voltage drop |
| VSEN, RGND, VDIFF | Differential remote sensing | Compensates PCB IR drop between controller and CPU; VDIFF = (VSEN − RGND) + (IREF − ICOMP) |
| ENLL, FS, PGOOD | Control & status | ENLL enables/disables controller (0.66 V threshold); FS sets frequency; PGOOD indicates OVP/UVP fault |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3-phase gate drivers | Eliminates need for external driver ICs; reduces BOM count and layout area in high-density VRM designs |
| Dual current sensing architecture | Combines rDS(ON) (channel balance) and DCR (droop/OCP) for optimal accuracy without added resistive losses |
| Dynamic VID support | Enables real-time voltage scaling during CPU state transitions (C-states), improving power efficiency |
| Adjustable reference offset | OFS pin allows ±150 mV output voltage offset via single external resistor - useful for margining or thermal compensation |
| Multi-tier overvoltage protection | Clamps rising output by turning on lower MOSFETs; includes fast-response OVP and delayed latch-off for robust CPU safety |
| Selectable phase count | 1-, 2-, or 3-phase operation configured via PVCC2/PVCC3 pin states - simplifies design reuse across platforms |
Applications
| Server CPU Power Delivery | Workstation VRM Design |
|---|---|
Use Scenario: Regulating core voltage for dual-socket Xeon or EPYC processors under dynamic 30–200 A load transients. IC Role / Device Role / Timing Role: Primary three-phase PWM controller managing gate timing, current sharing, and droop across multiple phases. Use Value: ±0.5% system accuracy and interleaved ripple reduction enable smaller output capacitors and tighter voltage margins at full load. |
Use Scenario: High-reliability power stage for professional-grade GPUs and FPGAs requiring stable 0.8–1.5 V core rails. IC Role / Device Role / Timing Role: Precision voltage regulator with differential remote sensing to compensate for board-level voltage drops. Use Value: VSEN/RGND interface ensures CPU die voltage matches setpoint despite PCB trace resistance up to 20 mΩ. |
| AMD Platform Reference Designs | Intel VRM10 Compliant Systems |
Use Scenario: Power solution for AMD Hammer-family CPUs (Opteron, Athlon 64 FX) requiring native VID code compatibility. IC Role / Device Role / Timing Role: VID decoder and PWM generator supporting AMD-specific 5-bit DAC mapping and dynamic VID updates. Use Value: Direct VID12.5 pin configuration eliminates firmware translation layer - reduces boot-time latency and validation effort. |
Use Scenario: VRM10.0-compliant motherboard design for Pentium 4 and Core 2 processors with 6-bit VID support. IC Role / Device Role / Timing Role: VRM10 DAC interpreter and three-phase controller with programmable load line slope. Use Value: Load-line droop programmed via DCR sensing meets Intel's ΔV vs. IOUT specification without external op-amps or resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar three-phase buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6566IRZ-T | Same silicon, extended temperature range (−40°C to +85°C) and identical pinout/package | Suitable for industrial or telecom systems requiring wider ambient operation | Select ISL6566IRZ-T when operating outside 0–70°C; otherwise ISL6566CRZ-T is cost-optimized for commercial servers/workstations. |
| RT8803AZSP | Three-phase controller with integrated drivers, but uses only DCR sensing (no rDS(ON) balance), no VID12.5 pin, and fixed VRM10-only decoding | Lacks AMD Hammer support and per-phase current balancing; requires external OVP circuitry | Choose RT8803AZSP only if AMD compatibility and channel-current matching are not required - ISL6566CRZ-T provides broader microprocessor coverage and superior balance accuracy. |
Compared with ISL6566IRZ-T, the ISL6566CRZ-T trades extended temperature rating for lower cost in commercial environments; compared with RT8803AZSP, it adds dual-sensing architecture and multi-standard VID decoding - critical for flexible, high-accuracy CPU VRMs.
Availability
ISL6566CRZ-T is available at Aetrix Electronics and suitable for server motherboard development, workstation VRM qualification, and AMD/Intel CPU power supply production requiring stable component supply and long-term lifecycle support.
Supply support for ISL6566CRZ-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 acquired Intersil in 2017 and maintains full support for legacy power management ICs including the ISL6566 family.
The ISL6566 product line was engineered specifically for high-efficiency, multi-phase CPU core voltage regulation in desktop, server, and workstation platforms - emphasizing integration, accuracy, and protection for advanced microprocessors.
FAQ
What is the operating temperature range for the ISL6566CRZ-T?
The ISL6566CRZ-T is rated for 0°C to +70°C ambient temperature operation, as specified in the ordering information table of FN9178 Rev 4.00. This commercial-grade temperature range aligns with typical server and workstation motherboard environments where airflow and thermal management ensure junction temperatures remain below the 150°C maximum limit. The ISL6566CRZ-T uses the same die as the industrial-grade ISL6566IRZ-T but is screened and tested for the narrower range.
Does the ISL6566CRZ-T support AMD Hammer microprocessors?
Yes, the ISL6566CRZ-T fully supports AMD Hammer VID codes through dedicated pin configuration: grounding both VRM10 and VID12.5 selects AMD Hammer 5-bit DAC decoding, as defined in Table 1 and Table 2 of FN9178 Rev 4.00. This enables direct compatibility with Opteron and Athlon 64 FX processors without firmware translation or external logic, preserving dynamic VID update capability during CPU state transitions.
How does the ISL6566CRZ-T achieve channel current balancing?
The ISL6566CRZ-T achieves precise per-channel current balancing using rDS(ON) current sensing on ISEN1–ISEN3 pins during the forced-off time of each phase. Each channel's sampled current is compared to the cycle-average current (IAVG), and pulse-width correction is applied in real time via the error amplifier path. This patented method - detailed in Figure 3 and page 11 of FN9178 - ensures balanced thermal loading across phases without external current-sense resistors.
What package type and lead finish does the ISL6566CRZ-T use?
The ISL6566CRZ-T uses a 40-lead, 6 mm × 6 mm QFN package (pkg drawing L40.6x6) with Pb-free matte tin plating and annealed termination finish, compliant with RoHS Directive 2011/65/EU. The exposed thermal pad on the underside improves heat dissipation, and θJA is specified at 32°C/W under standard JEDEC test conditions - critical for maintaining junction temperature in high-power VRM layouts.
Can the ISL6566CRZ-T be configured for single-phase operation?
Yes, the ISL6566CRZ-T supports 1-, 2-, or 3-phase operation via PVCC2 and PVCC3 pin states. For single-phase use, both PVCC2 and PVCC3 must be left unconnected or grounded - disabling channels 2 and 3 while retaining full functionality on PHASE1, UGATE1, LGATE1, and associated sensing pins. This flexibility allows reuse of the same controller IC across different platform power requirements without redesign.
ISL6566CRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Cut Tape (CT)
- Product Status:
- Obsolete
- Applications:
- -
- Voltage - Input:
- 3 ~ 12V
- Number of Outputs:
- -
- Voltage - Output:
- 0.84 ~ 1.6V
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (6x6)
ISL6566CRZ-T FAQ
1.How can I place an order for ISL6566CRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6566CRZ-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 ISL6566CRZ-T reliable?
The price and inventory of ISL6566CRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6566CRZ-T is usually 5 days.
3.What payment methods are accepted for ISL6566CRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6566CRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6566CRZ-T?
ISL6566CRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6566CRZ-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 ISL6566CRZ-T?
For technical support, including ISL6566CRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6566CRZ-T requirements.
6.How does Aetrix verify that ISL6566CRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6566CRZ-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 ISL6566CRZ-T meets industry standards.
7.What is the process for return or replacement of ISL6566CRZ-T?
All ISL6566CRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6566CRZ-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 ISL6566CRZ-T part is unused and in its original packaging.
Return procedure for ISL6566CRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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