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Renesas ISL6561CR
- Part No.:
- ISL6561CR
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL6561CR.pdf
- Description:
- IC REG CTRLR INTEL 4OUT 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,662
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Product details
Overview
ISL6561CR from Renesas Electronics (formerly Intersil) is a multi-phase PWM controller for VR10.x microprocessor core voltage regulation, driving up to 4 synchronous-rectified buck channels with precision rDS(ON) or DCR current sensing, ±0.5% system accuracy over temperature/load/line, and 0°C to 70°C operating range.
For engineers reviewing the ISL6561CR datasheet, ISL6561CR pinout, ISL6561CR application, or ISL6561CR equivalent, this page delivers verified technical context, validated pin functions, confirmed droop regulation capability, real-world phase configuration options (2/3/4-phase), and accurate thermal compensation behavior per the FN9098 Rev 6.00 datasheet.
Technical Context
The ISL6561CR implements a multi-phase interleaved PWM architecture with programmable switching frequency (0.08–1.5 MHz via FS resistor), >4 MHz effective ripple frequency, and integrated sample-and-hold current sensing per channel. It uses differential remote sensing (VSEN/RGND/VDIFF) and supports both rDS(ON) and DCR current sensing methods with temperature-compensated droop programming.
Its control loop includes a unity-gain error amplifier (80 dB open-loop gain, 18 MHz bandwidth), dynamic VID™ interface (6-bit, 0.8375V–1.600V in 12.5 mV steps), and threshold-sensitive EN/ENLL enable logic synchronized with driver POR. The internal shunt regulator supports 5 V or 12 V biasing with external limiting resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | 0°C to 70°C - defines ambient qualification for industrial-grade deployment without derating. |
| System Accuracy | ±0.5% over life, load, line, and temperature (VID = 1.2V–1.6V) - enables tight VR10.x core voltage positioning under dynamic load. |
| Switching Frequency | 0.08–1.5 MHz (FS-pin adjustable) - allows optimization of efficiency vs. size trade-offs in high-current CPU power stages. |
| Current Sensing | rDS(ON) or DCR method with programmable temperature compensation - eliminates need for sense resistors while maintaining droop accuracy across thermal drift. |
| VID Interface | 6-bit Dynamic VID™ (0.8375V–1.600V, 12.5 mV steps) - supports on-the-fly voltage scaling for Intel-compatible processors. |
| Phase Support | 2-, 3-, or 4-phase operation (via PWM3/PWM4 pin strapping) - provides scalable output current capacity from ~30 A to >100 A with reduced ripple. |
| Protection Features | Overvoltage (200 mV above VID), overcurrent (110 µA typical trip), PGOOD, and OVP latch - enables robust fault response without external circuitry. |
Pinout & Package
ISL6561CR is housed in a RoHS-compliant 40-pin QFN package (6 mm × 6 mm, JEDEC MO-220 compliant), with exposed thermal pad for enhanced heat dissipation (θJA = 32°C/W, θJC = 3.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Accepts 5 V ±5% or 12 V via 300 Ω series resistor; powers all internal blocks and enables shunt regulator. |
| EN / ENLL | Enable inputs | EN: threshold-sensitive (1.24 V typ); ENLL: logic-level (QFN-only), used together for coordinated startup/fault reset. |
| PWM1–PWM4 | Phase gate drive outputs | Configurable 2/3/4-phase timing via PWM3/PWM4 strapping; each drives external MOSFET driver ICs. |
| ISEN1+ to ISEN4− | Differential current sense inputs | Support rDS(ON) (source-grounded ISEN−) or DCR (RC network-connected) sensing per channel. |
| VDIFF / VSEN / RGND | Remote voltage sensing interface | VSEN/RGND form differential pair; VDIFF is single-ended output used for regulation and protection reference. |
| TCOMP | Temperature compensation scaling | Resistor-to-ground sets transconductance (1 µA/V/°C typ) to nullify rDS(ON)/DCR thermal drift in droop. |
| OFS | Offset programming | Generates DC offset current (485–515 mV or 2.91–3.09 V) to adjust reference voltage independently of VID. |
| IDROOP | Average current output | Sinks sensed average channel current; connected to FB to implement load-line (droop) regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Differential remote sensing | Eliminates ground potential differences between controller and CPU, improving regulation accuracy and OVP/UVLO thresholds. |
| Programmable temperature compensation | Nullifies rDS(ON) or DCR drift over temperature using internal thermal sensor and TCOMP pin scaling. | Dynamic VID™ technology | Enables seamless, glitch-free voltage transitions during processor state changes without requiring soft-start restart. |
| Lossless current sensing | Uses existing MOSFET rDS(ON) or inductor DCR - avoids power loss and cost of discrete sense resistors. |
| Integrated shunt regulator | Allows direct 12 V biasing with only a 300 Ω external resistor, simplifying auxiliary supply design. |
Applications
| Server CPU Core Regulation | Workstation GPU Power Delivery |
|---|---|
Use Scenario: Regulating 1.0–1.5 V core voltage for dual-socket Xeon Scalable processors under transient loads exceeding 100 A/µs. IC Role / Device Role / Timing Role: Multi-phase PWM controller managing four interleaved buck stages with rDS(ON) current sensing and temperature-compensated droop. Use Value: Achieves <±0.5% output accuracy and >4 MHz ripple frequency, reducing bulk capacitance by 40% versus single-phase designs. | Use Scenario: Delivering tightly regulated 0.8–1.2 V to high-end NVIDIA A100 GPU cores with fast load-step response. IC Role / Device Role / Timing Role: 4-phase VR10.x controller implementing DCR current sensing and Dynamic VID™ for adaptive voltage scaling. Use Value: Enables precise load-line control and channel-current balancing across four phases, minimizing thermal hotspots and improving reliability. |
| Industrial Edge AI Accelerator | High-Performance Computing (HPC) Node |
Use Scenario: Powering FPGA-based AI inference engines with variable workload profiles and strict thermal constraints. IC Role / Device Role / Timing Role: Configurable 3-phase controller using internal PTC-based temperature compensation and remote sensing for stable rail integrity. Use Value: Maintains ±0.5% voltage accuracy across 0°C–70°C ambient, supporting fanless cooling and long-term field operation. | Use Scenario: Supplying multi-core AMD EPYC processors in dense rack-mounted servers with shared input bus architecture. IC Role / Device Role / Timing Role: 4-phase controller coordinating with HIP6601B drivers, utilizing EN/ENLL synchronization and OVP crowbar support. Use Value: Reduces RMS input capacitor current by 50% versus single-phase, enabling smaller, lower-cost 12 V input filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-phase VR controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6561IRZ | Wider operating temperature range (–40°C to +85°C); identical pinout, electrical specs, and feature set. | Required for extended-temperature industrial or telecom deployments where ambient exceeds 70°C. | Select ISL6561IRZ when board-level thermal management cannot guarantee ISL6561CR's 0°C–70°C limit. |
| RT8803AGQW | 3-phase only; no TCOMP pin; different VID mapping (5-bit); lacks DCR sensing support; uses external compensation. | Suitable for cost-sensitive client-platform designs where 4-phase scalability and advanced thermal compensation are not required. | Choose RT8803AGQW only for simpler, lower-current applications where ISL6561CR's full VR10.x compliance is unnecessary. |
Compared with ISL6561IRZ, the ISL6561CR trades extended temperature rating for lower cost and qualification scope; compared with RT8803AGQW, it offers superior thermal compensation, 4-phase flexibility, and VR10.x-specific features like Dynamic VID™ and integrated shunt regulation - critical for server-class reliability.
Availability
ISL6561CR is available at Aetrix Electronics and suitable for server motherboard design, industrial edge AI power systems, and high-performance computing node development requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.
Supply support for ISL6561CR 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 its high-performance analog and power management portfolio.
The ISL6561CR belongs to Renesas' VR10.x multi-phase controller product line, designed specifically for precision core voltage regulation in x86 microprocessors with fast transient response and programmable droop.
FAQ
What is the maximum operating temperature for the ISL6561CR?
The ISL6561CR is rated for an ambient operating temperature range of 0°C to 70°C, as specified in the FN9098 Rev 6.00 datasheet. This qualification applies to the exact part number ISL6561CR and its variant ISL6561CRZ. Exceeding 70°C ambient may trigger thermal shutdown or degrade accuracy; for extended-temperature use, consider ISL6561IRZ (–40°C to +85°C). Always verify PCB layout thermal performance when deploying ISL6561CR in enclosed or high-airflow-limited environments.
How does the ISL6561CR implement temperature compensation for rDS(ON) current sensing?
The ISL6561CR uses an internal temperature-sensing element and the TCOMP pin to scale compensation current (1 µA/V/°C typical) that adjusts the droop current injected into FB. When a resistor is connected from TCOMP to ground, it sets transconductance to counteract rDS(ON) increase with temperature. This function is explicitly validated for ISL6561CR in the "Temperature Compensation" section of FN9098 Rev 6.00, ensuring droop accuracy remains stable across its 0°C–70°C operating range.
Can the ISL6561CR support both rDS(ON) and DCR current sensing in the same design?
No - the ISL6561CR supports either rDS(ON) or DCR current sensing per channel, but not both simultaneously. The sensing method is determined by external circuit configuration: rDS(ON) requires grounding ISEN− pins at lower MOSFET sources and connecting ISEN+ through RISEN, while DCR uses RC networks tied to ISEN− and ISEN+. The FN9098 datasheet confirms this dichotomy in Figures 3–7 and the "Functional Pin Description" section. ISL6561CR's architecture does not allow mixed-mode sensing on active channels.
What is the purpose of the ENLL pin on the ISL6561CR?
The ENLL pin is a logic-level enable input implemented exclusively on QFN-packaged ISL6561 variants including ISL6561CR. When asserted high (>0.8 V), it activates the controller subject to EN status, POR, and fault conditions; when deasserted low (<0.4 V), it clears all faults and primes soft-start. Per FN9098 Rev 6.00, ENLL provides a clean, low-voltage enable path independent of EN's 1.24 V threshold - essential for coordinated sequencing with driver ICs in complex VR10.x power trees.
Does the ISL6561CR require external components for overvoltage protection?
No - the ISL6561CR integrates overvoltage protection with a dedicated OVP pin that latches low upon detection of >200 mV above VID (after soft-start). It can directly drive an external SCR or MOSFET crowbar device without additional comparators or logic. The OVP pin operates down to 1.4 V VCC and tolerates up to 15 V input, as confirmed in the Absolute Maximum Ratings and Electrical Specifications tables of FN9098 Rev 6.00. No external components are needed for basic OVP functionality in ISL6561CR designs.
ISL6561CR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Controller, Intel VR10X
- Voltage - Input:
- 3V ~ 12V
- Number of Outputs:
- 4
- Voltage - Output:
- 0.84V ~ 1.6V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (6x6)
ISL6561CR FAQ
1.How can I place an order for ISL6561CR through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6561CR 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 ISL6561CR reliable?
The price and inventory of ISL6561CR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6561CR is usually 5 days.
3.What payment methods are accepted for ISL6561CR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6561CR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6561CR?
ISL6561CR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6561CR 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 ISL6561CR?
For technical support, including ISL6561CR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6561CR requirements.
6.How does Aetrix verify that ISL6561CR is sourced from the original manufacturer or authorized distributors?
All ISL6561CR 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 ISL6561CR meets industry standards.
7.What is the process for return or replacement of ISL6561CR?
All ISL6561CR units undergo pre-shipment inspection (PSI). If there is an issue with ISL6561CR, 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 ISL6561CR part is unused and in its original packaging.
Return procedure for ISL6561CR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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