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Renesas ISL6561CRZ-T
- Part No.:
- ISL6561CRZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL6561CRZ-T.pdf
- Description:
- IC REG CTRLR INTEL 4OUT 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,994
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Product details
Overview
ISL6561CRZ-T from Renesas (formerly Intersil) is a 4-phase PWM controller for VR10.x microprocessor core voltage regulation, featuring precision rDS(ON) or DCR differential current sensing, ±0.5% system accuracy over temperature/load/line, >4MHz ripple frequency, and integrated temperature compensation. It drives synchronous buck channels in parallel for high-efficiency CPU power delivery in server and workstation motherboards.
For engineers reviewing the ISL6561CRZ-T datasheet, ISL6561CRZ-T pinout, ISL6561CRZ-T application, or ISL6561CRZ-T equivalent, key selection criteria include multi-phase phase count configuration (2/3/4), droop accuracy under thermal drift, remote-sense amplifier bandwidth (20 MHz), shunt regulator compatibility with 5V/12V bias, and OVP crowbar drive capability without external components.
Technical Context
The ISL6561CRZ-T implements a multi-phase interleaved architecture with programmable switching frequency (0.08–1.5 MHz via FS resistor), four independent PWM outputs (PWM1–PWM4), and channel-current balancing logic that sums sampled ISEN currents and divides by active phase count. Its error amplifier delivers 80 dB open-loop gain and 18 MHz bandwidth to support fast transient response.
Current sensing operates in two validated modes: rDS(ON) sensing using lower-MOSFET source-to-drain voltage with virtual-ground ISEN+ inputs, or DCR sensing via RC network across output inductor; both feed into sample-and-hold circuits with fixed 1/3-cycle sampling window synchronized to PWM falling edges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Phase Count | Configurable 2-, 3-, or 4-phase operation via PWM3/PWM4 pin states |
| System Accuracy | ±0.5% over life, load, line, and temperature (0°C to 85°C, VID = 1.2–1.6V) |
| Switching Frequency | 0.08–1.5 MHz set by FS-to-GND resistor; >4MHz effective ripple frequency in 4-phase mode |
| Current Sensing | Differential rDS(ON) or DCR sensing with 74–91 µA sensed current tolerance (0°C to 85°C) |
| Remote Sense BW | 20 MHz bandwidth enables accurate DC/AC voltage feedback at point-of-load |
| OVP Threshold | 200 mV above VID after soft start; latched OVP pin drives external SCR/MOSFET crowbar |
| Temp Compensation | Programmable TCOMP scaling; 1 µA/V/°C transconductance corrects rDS(ON)/DCR drift |
| VCC Supply | 5V ±5% or 12V via internal 6.02V shunt regulator with ≤25 mA sink capability |
Pinout & Package
ISL6561CRZ-T uses a RoHS-compliant 40-pin QFN package (6 mm × 6 mm, JEDEC MO-220 QFN outline, exposed thermal pad).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Primary supply input | Accepts 5V direct or 12V via 300Ω limiting resistor; internal shunt clamps at 6.02V max |
| EN / ENLL | Enable control inputs | EN: threshold-sensitive (1.24V rising); ENLL: logic-level enable (QFN-only, 0.8V high/0.4V low) |
| PWM1–PWM4 | Phase gate-drive outputs | Open-drain PWM signals; phase count set by tying PWM3/PWM4 to VCC |
| ISEN1+ to ISEN4− | Differential current sense inputs | Four independent pairs for rDS(ON) (grounded ISEN−) or DCR (RC-network referenced) sensing |
| VSEN / RGND / VDIFF | Remote voltage sense interface | VSEN/RGND form differential input; VDIFF is single-ended output fed to FB/COMP loop |
| VID0–VID4, VID12.5 | Microprocessor VID interface | 6-bit Dynamic VID™ input (0.8375–1.600V in 12.5mV steps); VID12.5 enables 12.5mV resolution |
| OFS / TCOMP / IDROOP | Load-line and thermal tuning | OFS sets dc offset; TCOMP scales temp compensation; IDROOP outputs average droop current |
| OVP / PGOOD / FS / REF / DAC | Protection, timing, reference | OVP latches on overvoltage; PGOOD open-drain status; FS sets frequency; REF/DAC configure offset |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic VID™ technology | Enables seamless on-the-fly core voltage changes without power interruption or reconfiguration delay |
| Differential remote sensing | Eliminates ground potential differences between controller and CPU socket, improving regulation accuracy by >0.3% |
| Programmable temperature compensation | Nullifies rDS(ON)/DCR thermal drift effects on droop accuracy using internal thermal sensor and TCOMP pin scaling |
| Integrated shunt regulator | Supports direct 12V bias with only a 300Ω series resistor-no external LDO required for dual-rail systems |
| Channel-current balancing | Active per-cycle averaging of sampled ISEN currents ensures ≤5% inter-phase current mismatch under full load |
| No-component OVP protection | OVP pin directly drives external crowbar device; no external comparator or resistor divider needed for overvoltage shutdown |
Applications
| Server CPU Power Delivery | Workstation GPU Core Regulation |
|---|---|
Use Scenario: 4-phase VR10.x buck converter supplying 1.2V/120A to dual-socket Xeon Scalable processors with <100ns load-step transients. IC Role / Device Role / Timing Role: Primary multi-phase PWM controller managing phase interleaving, droop-based load-line programming, and real-time current balancing across four synchronous buck stages. Use Value: Achieves ±0.5% output regulation while reducing output capacitance by 60% versus single-phase design due to >4MHz effective ripple frequency. | Use Scenario: High-density PCIe card delivering 0.95V/80A to NVIDIA Quadro RTX GPUs with tight thermal constraints and dynamic voltage scaling. IC Role / Device Role / Timing Role: Core voltage controller implementing DCR current sensing with external NTC thermistor for enhanced thermal compensation during sustained compute loads. Use Value: Maintains droop accuracy within ±1.1% from -40°C to 85°C using programmable TCOMP scaling, eliminating need for recalibration across environmental chambers. |
| Enterprise Storage Controller PSU | AI Accelerator Board Power |
Use Scenario: 3-phase 1.05V/60A supply for NVMe RAID controllers requiring high reliability, low EMI, and coordinated rail sequencing with 12V auxiliary supplies. IC Role / Device Role / Timing Role: Multi-phase controller using EN/ENLL dual-enable logic to synchronize startup with 12V driver rails and PGOOD signaling to system management controller. Use Value: Threshold-sensitive EN input and fault-reset ENLL pin enable deterministic power-up sequencing compliant with Intel SSI EPS 2.95 specifications. | Use Scenario: 4-phase 0.85V/150A supply for AMD Instinct MI300 AI accelerators with rapid DVFS transitions and strict ±15mV output tolerance. IC Role / Device Role / Timing Role: Precision core regulator using rDS(ON) sensing on low-RDS(on) MOSFETs and Dynamic VID™ to execute sub-µs voltage updates during inference workloads. Use Value: Delivers 18 MHz error amplifier bandwidth and 6.0 V/µs slew rate to maintain regulation during 50A/µs load steps without overshoot exceeding 25mV. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-phase PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IR35201MTRPBF | 8-phase capable; supports Intel VR12.5/IMVP8; integrated MOSFET drivers; no internal shunt regulator | Targets higher-current CPUs (e.g., Sapphire Rapids); requires external 5V bias; lacks 12V direct bias option | Choose IR35201MTRPBF when scaling beyond 4 phases or requiring IMVP8 compliance; avoid if 12V bias simplification is critical |
| TPS53679RSLR | 6-phase controller; TI's D-CAP3 topology; no VID12.5 pin; integrated boot diode; 3.3V/5V only bias | Optimized for client/mobile platforms; supports adaptive voltage positioning but not VR10.x droop profile | Choose TPS53679RSLR for cost-sensitive client designs with simpler VID mapping; avoid for VR10.x server compliance |
Compared with IR35201MTRPBF and TPS53679RSLR, the ISL6561CRZ-T uniquely combines VR10.x droop compliance, 12V bias support via internal shunt, and QFN thermal performance in a 4-phase footprint-making it optimal for legacy server upgrades where layout reuse and thermal density are constrained.
Availability
ISL6561CRZ-T is available at Aetrix Electronics and suitable for server motherboard design, enterprise storage power supplies, and AI accelerator board development requiring stable component supply and long-term industrial lifecycle support.
Supply support for ISL6561CRZ-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 manufacturing continuity for its high-performance analog and power management portfolio.
The ISL6561CRZ-T belongs to Renesas' VR10.x-compliant multi-phase PWM controller product line, designed specifically for precision core voltage regulation in high-end x86 server and workstation platforms with demanding transient response and thermal stability requirements.
FAQ
What is the operating temperature range for the ISL6561CRZ-T?
The ISL6561CRZ-T is rated for 0°C to 70°C ambient operation, as specified in the "Operating Conditions" table on page 8 of FN9098 Rev 6.00. This commercial-grade rating distinguishes it from the ISL6561IRZ-T (–40°C to 85°C), and thermal design must ensure junction temperature remains below 150°C using the QFN package's θJA = 32°C/W.
How does the ISL6561CRZ-T implement temperature compensation for rDS(ON) drift?
The ISL6561CRZ-T uses an internal temperature-sensing element and the TCOMP pin to scale compensation current. With a resistor from TCOMP to GND, the IC injects a temperature-proportional current (1 µA/V/°C transconductance) into the droop current path, counteracting rDS(ON) increase and maintaining ±0.5% system accuracy across temperature-verified in the Electrical Specifications table on page 9.
Can the ISL6561CRZ-T operate with a 12V bias supply without external regulators?
Yes. The ISL6561CRZ-T integrates a shunt regulator that accepts 12V directly via a 300Ω series resistor on the VCC pin, clamping VCC to 5.6–6.3V (typical 5.9V) while sinking up to 25mA. This eliminates the need for an external LDO or DC-DC converter, simplifying bias design for 12V-input server power architectures.
What are the valid configurations for phase count selection on the ISL6561CRZ-T?
The ISL6561CRZ-T supports 2-, 3-, or 4-phase operation via PWM3 and PWM4 pins: tie PWM3 to VCC for 2-phase; tie PWM4 to VCC for 3-phase; leave both floating for default 4-phase. This configuration is explicitly defined in the "Functional Pin Description" section on page 10 and confirmed in Figure 15's timing diagrams.
Does the ISL6561CRZ-T require external components for overvoltage protection?
No. The ISL6561CRZ-T provides a dedicated OVP pin that latches low upon detecting >200mV over VID and can directly drive an external SCR or MOSFET crowbar device. As stated in the Features list and Electrical Specifications (page 9), "No Additional External Components Needed" for basic OVP functionality-only the crowbar switch and gate resistor are required.
ISL6561CRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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)
ISL6561CRZ-T FAQ
1.How can I place an order for ISL6561CRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6561CRZ-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 ISL6561CRZ-T reliable?
The price and inventory of ISL6561CRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6561CRZ-T is usually 5 days.
3.What payment methods are accepted for ISL6561CRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6561CRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6561CRZ-T?
ISL6561CRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6561CRZ-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 ISL6561CRZ-T?
For technical support, including ISL6561CRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6561CRZ-T requirements.
6.How does Aetrix verify that ISL6561CRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6561CRZ-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 ISL6561CRZ-T meets industry standards.
7.What is the process for return or replacement of ISL6561CRZ-T?
All ISL6561CRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6561CRZ-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 ISL6561CRZ-T part is unused and in its original packaging.
Return procedure for ISL6561CRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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