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Renesas ISL6561CRZA-T
- Part No.:
- ISL6561CRZA-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL6561CRZA-T.pdf
- Description:
- IC REG CTRLR INTEL 4OUT 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,394
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Product details
Overview
ISL6561CRZA-T 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 >4MHz ripple frequency for fast transient response in server CPU power delivery.
For engineers reviewing the ISL6561CRZA-T datasheet, ISL6561CRZA-T pinout, ISL6561CRZA-T application, or ISL6561CRZA-T equivalent, key selection considerations include its 40-pin QFN package, 2–4 phase configurability via PWM3/PWM4 logic, integrated temperature-compensated current sensing, Dynamic VID™ support for on-the-fly voltage changes, and dual bias capability (5V or 12V via internal shunt regulator).
Technical Context
The ISL6561CRZA-T implements a multi-phase interleaved buck architecture with independent channel current sampling during forced-off time (1/3 switching period), enabling precise per-channel current balancing and droop programming. Its error amplifier features 80dB open-loop gain and 18MHz bandwidth, paired with a sawtooth oscillator (0.08–1.5MHz adjustable via FS resistor) and high-speed PWM outputs with 66.7% max duty cycle.
Current sensing operates via differential amplifiers on ISENx+/ISENx− pairs, supporting either MOSFET rDS(ON) (with virtual-ground ISEN+ referenced to PHASE node) or inductor DCR (via external RC network). Temperature compensation is applied through TCOMP pin using an external resistor to scale thermal correction of droop current based on internal die temperature sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Phase Count | Configurable for 2-, 3-, or 4-phase operation via PWM3/PWM4 pin states; enables scalable power delivery from 30A to >100A. |
| System Accuracy | ±0.5% over life, load, line, and temperature (0°C to 85°C) at VID = 1.2V–1.6V; ensures tight core voltage regulation for Intel VR10.x compliance. |
| Current Sensing Method | Supports lossless rDS(ON) sensing (lower MOSFET source-to-drain) or DCR sensing (inductor winding resistance); eliminates need for sense resistors. |
| Switching Frequency | Adjustable 0.08–1.5MHz via FS-to-GND resistor; ripple frequency exceeds 4MHz in 4-phase mode, reducing output capacitor count. |
| VID Interface | 6-bit Dynamic VID™ input (VID4–VID0 + VID12.5) covering 0.8375V–1.600V in 12.5mV steps; supports seamless voltage transitions during runtime. |
| Temperature Compensation | Programmable via TCOMP pin with 1μA/V/°C transconductance; nullifies rDS(ON) or DCR drift with temperature for stable droop performance. |
| Bias Supply | Internal shunt regulator accepts 12V input (via 300Ω resistor) and regulates VCC to 5.9V typical; also supports direct 5V bias. |
Pinout & Package
ISL6561CRZA-T is housed in a RoHS-compliant 40-pin QFN package (6mm × 6mm, JEDEC MO-220 QFN outline, L40.6x6), featuring an exposed thermal pad for enhanced heat dissipation (θJC = 3.5°C/W). The package supports high-density PCB layouts and thin-profile system integration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Primary power supply input | Accepts 5V direct or 12V via 300Ω limiting resistor; powers all internal circuitry and enables shunt regulation. |
| EN / ENLL | Enable control inputs | EN is threshold-sensitive (1.24V activation); ENLL is logic-level enable (QFN-only); both coordinate startup timing with driver ICs and clear faults. |
| PWM1–PWM4 | Phase gate-drive outputs | Open-drain PWM signals drive external MOSFET drivers; phase count set by tying PWM3/PWM4 to VCC (2/3-phase) or leaving floating (4-phase). |
| ISEN1+ to ISEN4− | Differential current sense inputs | Four independent differential pairs accept rDS(ON) or DCR voltage signals; inactive channels require open-circuit inputs. |
| TCOMP | Temperature compensation scaling | Resistor-to-ground sets thermal correction gain; compensates for MOSFET rDS(ON) or inductor DCR drift across temperature. |
| OFS | Reference offset programming | External resistor to GND or VCC generates programmable DC offset (485–515mV or 2.91–3.09V) at REF pin for precise load-line tuning. |
Key Features
| Feature | Design Value |
|---|---|
| Differential remote voltage sensing (VDIFF/VSEN/RGND) | Eliminates ground potential differences between controller and load, improving regulation accuracy and OVP/UVLO trip consistency. |
| Dynamic VID™ with 6-bit interface | Enables real-time core voltage adjustment without interrupting operation-critical for processor power-state transitions (C-states, Turbo Boost). |
| Integrated programmable temperature compensation | Nullifies thermal drift of rDS(ON) or DCR-based current sensing, maintaining ±0.5% droop accuracy across 0°C to 85°C ambient. |
| Multi-phase channel-current balancing | Digitally sums sampled per-channel currents and adjusts individual PWM duty cycles to equalize load distribution across phases. |
| Overvoltage protection with crowbar drive (OVP pin) | OVP pin latches low during overvoltage events and can directly drive SCR/MOSFET crowbar circuits-no external comparator required. |
Applications
| Server CPU Core Power Delivery | High-Performance Desktop VRM |
|---|---|
|
Use Scenario: Regulating 1.0–1.5V core voltage for dual-socket Xeon Scalable processors under dynamic 200A+ load transients. IC Role / Device Role / Timing Role: Primary multi-phase PWM controller managing four synchronous buck stages with interleaved timing and precision droop. Use Value: >4MHz effective ripple frequency reduces output capacitance by ~60% vs. single-phase; ±0.5% accuracy maintains CPU stability during AVX-512 workloads. |
Use Scenario: Delivering tightly regulated 1.2V core voltage to Intel Core i9 processors with rapid load steps exceeding 100A/μs. IC Role / Device Role / Timing Role: VR10.x-compliant controller implementing rDS(ON) current sensing and Dynamic VID™ for adaptive voltage scaling. Use Value: Forced-off-time current sampling ensures accurate per-phase current measurement during fast transients, enabling robust OCP response within 200ns. |
| AI Accelerator Board Power | Network Processor Voltage Regulation |
|
Use Scenario: Powering FPGA-based AI inference accelerators requiring 0.85V @ 80A with <1% voltage deviation during burst-mode computation. IC Role / Device Role / Timing Role: Multi-phase controller configured for 4-phase operation with DCR current sensing and remote sensing for board-edge loads. Use Value: Differential remote sensing (VDIFF/VSEN) corrects for PCB IR drop, ensuring <±5mV regulation error at the FPGA power pins. |
Use Scenario: Supplying 1.1V core voltage to multi-core network processors in telecom line cards with strict thermal constraints. IC Role / Device Role / Timing Role: 3-phase VR controller using internal temperature compensation to maintain droop accuracy despite 60°C ambient rise near ASICs. Use Value: TCOMP-driven thermal correction preserves load-line slope across temperature, preventing premature thermal throttling or voltage overshoot. |
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 |
|---|---|---|---|
| IR35201MTRPBF | 8-phase capable, digital PWM with PMBus interface; no analog VID support; requires external EEPROM for configuration. | Targeted at systems needing telemetry, fault logging, and programmable loop compensation-not suitable for legacy VR10.x analog VID platforms. | Select IR35201MTRPBF only when digital control, telemetry, and firmware-upgradable parameters are required; not drop-in compatible with ISL6561CRZA-T. |
| TPS53679RSLR | 6-phase analog controller with CSD (current-summing droop); no rDS(ON)/DCR dual-sensing mode; fixed 1.2V reference offset option only. | Optimized for high-current GPU VRMs; lacks Dynamic VID™ and programmable OFS pin-limited flexibility for CPU-specific load-line tuning. | Choose TPS53679RSLR for cost-sensitive, high-phase-count GPU power where analog simplicity outweighs VID flexibility and temperature compensation granularity. |
Compared with IR35201MTRPBF and TPS53679RSLR, the ISL6561CRZA-T uniquely combines analog VID compatibility, dual rDS(ON)/DCR sensing, and user-programmable temperature compensation-making it optimal for legacy and mixed-signal VR10.x CPU power designs requiring minimal BOM and proven analog stability.
Availability
ISL6561CRZA-T is available at Aetrix Electronics and suitable for server motherboard design, high-end desktop VRM development, and AI accelerator board production requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for ISL6561CRZA-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 its high-performance analog power management portfolio, including VR controllers used in datacenter and computing infrastructure.
The ISL6561CRZA-T belongs to Renesas' VR10.x multi-phase PWM controller product line, designed specifically for precision core voltage regulation in Intel-compatible microprocessor platforms with demanding transient response and thermal stability requirements.
FAQ
What is the operating temperature range for the ISL6561CRZA-T?
The ISL6561CRZA-T is specified for 0°C to 70°C ambient operation (Commercial grade). This differs from the ISL6561IRZ variant rated for -40°C to 85°C. The CRZA-T's thermal design uses θJA = 32°C/W and θJC = 3.5°C/W, requiring adequate PCB copper area under the exposed pad for reliable operation at full load.
How does the ISL6561CRZA-T implement temperature compensation for current sensing?
The ISL6561CRZA-T uses an internal die temperature sensor feeding a programmable transconductance amplifier (1μA/V/°C) routed to the TCOMP pin. An external resistor from TCOMP to GND scales the compensation current, which adjusts the FB droop current to counteract rDS(ON) or DCR increase with temperature-maintaining ±0.5% droop accuracy across 0°C to 85°C.
Can the ISL6561CRZA-T operate with both 5V and 12V bias supplies?
Yes, the ISL6561CRZA-T supports dual bias modes: direct 5V connection to VCC, or 12V applied through a 300Ω series resistor. Its internal shunt regulator clamps VCC to 5.9V typical (max 6.3V) while sinking up to 25mA, eliminating need for external LDOs in 12V-input systems.
What determines the number of active phases in the ISL6561CRZA-T?
Phase count is set by logic levels on PWM3 and PWM4 pins: PWM3 = floating + PWM4 = floating → 4-phase; PWM3 = VCC → 2-phase; PWM4 = VCC → 3-phase. These pins configure internal channel enable logic and adjust interleaving timing-no register writes or firmware required.
Does the ISL6561CRZA-T require external components for overvoltage protection?
No. The ISL6561CRZA-T integrates overvoltage detection with a dedicated OVP pin that latches low during fault conditions and can directly drive an external SCR or MOSFET crowbar circuit. No external comparator, reference, or timing components are needed for basic OVP functionality.
ISL6561CRZA-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)
ISL6561CRZA-T FAQ
1.How can I place an order for ISL6561CRZA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6561CRZA-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 ISL6561CRZA-T reliable?
The price and inventory of ISL6561CRZA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6561CRZA-T is usually 5 days.
3.What payment methods are accepted for ISL6561CRZA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6561CRZA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6561CRZA-T?
ISL6561CRZA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6561CRZA-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 ISL6561CRZA-T?
For technical support, including ISL6561CRZA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6561CRZA-T requirements.
6.How does Aetrix verify that ISL6561CRZA-T is sourced from the original manufacturer or authorized distributors?
All ISL6561CRZA-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 ISL6561CRZA-T meets industry standards.
7.What is the process for return or replacement of ISL6561CRZA-T?
All ISL6561CRZA-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6561CRZA-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 ISL6561CRZA-T part is unused and in its original packaging.
Return procedure for ISL6561CRZA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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