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Renesas ISL6556BCRZA-T
- Part No.:
- ISL6556BCRZA-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ISL6556BCRZA-T.pdf
- Description:
- IC REG CTRLR INTEL 4OUT 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,542
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Product details
Overview
ISL6556BCRZA-T from Intersil is a multi-phase PWM controller for VR10.x microprocessor core voltage regulation, supporting 2–4 synchronous-buck phases up to 1.5 MHz per phase, featuring 6-bit VID input (0.8375V–1.600V in 12.5mV steps), rDS(ON)-based current sensing with programmable temperature compensation, and ±0.5% system accuracy over temperature and life.
For engineers reviewing the ISL6556BCRZA-T datasheet, ISL6556BCRZA-T pinout, ISL6556BCRZA-T application, or ISL6556BCRZA-T equivalent, this page delivers verified technical context, validated pin functions, real-world application mappings, and confirmed alternative options for VR10.x power delivery design and supply continuity planning.
Technical Context
The ISL6556BCRZA-T implements interleaved multi-phase control using four PWM outputs (PWM1–PWM4) with configurable 2/3/4-phase operation via PWM3/PWM4 logic states, and integrates a unity-gain differential remote-sense amplifier (VDIFF/VSEN/RGND) to eliminate ground potential differences between controller and load.
It employs adaptive voltage positioning (AVP/droop) via rDS(ON) current sensing on ISEN1–ISEN4, with TCOMP pin enabling programmable thermal compensation of droop slope, and supports Dynamic VID™ for seamless on-the-fly output voltage changes during processor state transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Range | 0.8375V–1.600V in 12.5mV VID steps - enables precise core voltage selection for Intel VR10.x-compliant CPUs. |
| Phase Support | 2, 3, or 4 phases - selectable via PWM3/PWM4 logic levels; reduces output ripple amplitude by up to 4× vs single-phase. |
| Switching Frequency | 0.08–1.5 MHz per phase - set by external FS-to-ground resistor; higher frequency allows smaller magnetics and capacitors. |
| System Accuracy | ±0.5% over temp/life (VID = 1.2V–1.6V) - ensures stable core voltage under thermal drift and aging without recalibration. |
| Current Sensing | rDS(ON)-based with TCOMP scaling - eliminates sense resistors, reduces BOM cost, and maintains droop accuracy across temperature. |
| Remote Sensing | Differential VSEN/RGND input with VDIFF output - rejects PCB IR drop and ground noise, critical for sub-1V CPU rail stability. |
| OVP Threshold | +200 mV above VID - fast overvoltage protection without external components; OVP pin drives crowbar devices directly. |
Pinout & Package
ISL6556BCRZA-T uses a 32-lead QFN package (5×5 mm, JEDEC MO-220 QFN), with exposed thermal pad for enhanced heat dissipation (θJA = 32°C/W, θJC = 3.5°C/W). Pin functions are validated per FN9097 Rev 4.00, Page 2 (top view) and Page 9 (functional description).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply input | Accepts 5V direct or 12V via 300Ω series resistor; internal shunt regulator clamps at 5.9V typical. |
| ENLL | Logic-level enable | QFN-only pin; high-active enable that clears faults and primes soft-start when asserted. |
| VID4–VID0, VID12.5 | Digital reference input | 6-bit VID bus; decodes to 48 discrete voltages (0.8375V–1.600V); supports Dynamic VID™ transitions. |
| TCOMP | Temperature compensation | Resistor-to-ground sets transconductance (1 µA/V/°C); nullifies rDS(ON) drift for accurate droop. |
| ISEN1–ISEN4 | Channel current sense | Virtual-ground inputs; measure lower-MOSFET rDS(ON) voltage to derive channel current for balancing and OCP. |
| PWM1–PWM4 | Phase drive outputs | CMOS-compatible PWM signals; timing interleaved per active phase count (2/3/4); min off-time ≥1/3 cycle for sampling. |
| OFS / OFSOUT | Offset programming | OFS sets polarity/magnitude of DC offset current; OFSOUT (QFN only) delivers it to FB for independent load-line tuning. |
| VSEN / RGND / VDIFF | Remote sensing interface | VSEN/RGND accept differential load voltage; VDIFF outputs single-ended error signal referenced to local GND. |
Key Features
| Feature | Design Value |
|---|---|
| Differential remote voltage sensing | Eliminates PCB trace IR drop errors - enables ±0.5% regulation accuracy at CPU die despite 100+ mΩ ground path resistance. |
| Programmable rDS(ON) temperature compensation | TCOMP pin adjusts droop slope in real time - maintains consistent AVP performance from 0°C to 105°C junction temperature. |
| Dynamic VID™ technology | Supports seamless voltage transitions during CPU P-state changes - no output glitch or fault latch during VID updates. |
| Integrated OVP with crowbar drive | OVP pin sinks >100mA at 1.9V - directly triggers external SCR/MOSFET for fast (<100ns) overvoltage shutdown without extra logic. |
| Configurable 2/3/4-phase operation | Hardware-selectable via PWM3/PWM4 logic levels - avoids firmware dependency and enables flexible board reuse across power tiers. |
Applications
| Desktop CPU Power Delivery | Server Processor VRM |
|---|---|
|
Use Scenario: Regulating core voltage for dual-core Pentium 4 or Xeon processors requiring VR10.x compliance and dynamic VID transitions. IC Role / Device Role / Timing Role: Primary multi-phase PWM controller coordinating up to four HIP6601B MOSFET drivers; manages interleaved timing, current balancing, and AVP droop. Use Value: Achieves <1% output ripple at 36A load while maintaining ±0.5% voltage accuracy across -40°C to +85°C ambient - meets Intel VR10.1 specification. |
Use Scenario: High-current VRM for dual-socket server motherboards with thermal constraints and strict transient response requirements. IC Role / Device Role / Timing Role: Core voltage controller driving parallel buck stages; uses TCOMP and rDS(ON) sensing to stabilize droop under rapid CPU load steps (0–100% in <10µs). Use Value: Reduces required output capacitance by 60% vs single-phase design and lowers RMS input capacitor current from 11.9A to 5.9A - cuts thermal stress and BOM cost. |
| Embedded Workstation Power | High-Performance Computing Module |
|
Use Scenario: Compact VRM on space-constrained workstation blades where PCB area and height are limited. IC Role / Device Role / Timing Role: QFN-packaged controller enabling near-chip-scale layout; leverages OFS/OFSOUT for fine-tuned load-line calibration without external op-amps. Use Value: 5×5 mm QFN footprint improves PCB efficiency and thermal performance (θJA = 32°C/W) - supports 125°C max junction temperature in sealed enclosures. |
Use Scenario: Modular compute card requiring field-upgradable voltage rails and robust fault handling for AI accelerator co-processors. IC Role / Device Role / Timing Role: Multi-phase controller with ENLL-driven sequencing and PGOOD signaling - synchronizes power-up with FPGA configuration and memory initialization. Use Value: Threshold-sensitive EN/ENLL inputs and latched OVP provide deterministic startup/fault behavior - eliminates need for external sequencers or supervisors. |
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 |
|---|---|---|---|
| ISL6556BCRZ | Same silicon, Pb-free SOIC-28 variant (not QFN); lacks ENLL and OFSOUT pins; no TCOMP support. | Legacy board designs with SOIC footprint; unsuitable for new compact layouts requiring QFN thermal performance. | Select ISL6556BCRZ only for drop-in replacement on existing SOIC-based VRMs - not for new designs targeting VR10.x specs. |
| IR35201MTRPBF | Single-chip digital VR12.5 controller; supports SMBus, telemetry, and adaptive loop tuning; no analog TCOMP or OFSOUT. | Systems requiring PMBus communication, margining, or real-time telemetry - not compatible with analog-only VR10.x BIOS. | Choose IR35201MTRPBF for next-gen platforms needing digital control and diagnostics; avoid for VR10.x legacy compatibility. |
Compared with ISL6556BCRZ and IR35201MTRPBF, the ISL6556BCRZA-T uniquely combines analog precision (±0.5% accuracy), hardware-configurable phase count, and QFN-optimized thermal performance - making it the only viable option for cost-sensitive, thermally constrained VR10.x desktop/server VRMs requiring guaranteed analog compatibility.
Availability
ISL6556BCRZA-T is available at Aetrix Electronics and suitable for desktop CPU power delivery, server VRMs, embedded workstation boards, and high-performance computing modules requiring stable component supply and long-term industrial availability.
Supply support for ISL6556BCRZA-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
Intersil (now part of Renesas Electronics) is a semiconductor company specializing in high-performance analog and power management ICs for computing, industrial, and communications markets.
The ISL6556BCRZA-T belongs to Intersil's VR10.x multi-phase controller product line, designed specifically to meet Intel's voltage regulation specifications for Pentium 4 and early Xeon processors with emphasis on analog accuracy, thermal robustness, and hardware configurability.
FAQ
What is the function of the ENLL pin on the ISL6556BCRZA-T?
The ENLL pin is a logic-level enable input exclusive to the QFN-packaged ISL6556BCRZA-T. When driven high, it activates the controller subject to EN status, POR, and fault conditions; when deasserted, it clears all fault latches and primes the device for soft-start. It is not present on SOIC variants like ISL6556BCBZA-T, confirming its role in advanced sequencing for compact VRMs.
How does the ISL6556BCRZA-T implement temperature compensation for rDS(ON) current sensing?
The ISL6556BCRZA-T uses the TCOMP pin to accept an external resistor-to-ground, setting a transconductance of 1 µA/V/°C. This scales internal thermal compensation current (10–20 µA at 40°C) to adjust the droop current injected into FB, counteracting rDS(ON) drift across 0°C–105°C. This ensures load-line accuracy remains within ±0.5% without external calibration.
Can the ISL6556BCRZA-T support 3-phase operation, and how is it configured?
Yes, the ISL6556BCRZA-T supports 3-phase operation by tying the PWM4 pin to VCC while leaving PWM3 floating or grounded. This configures interleaved timing with 1/3-cycle phase shifts between PWM1–PWM3 outputs. The datasheet confirms this mode on Page 6 (Typical Application) and Page 9 (Functional Pin Description), and it is distinct from 2-phase (PWM3 = VCC) and default 4-phase (both PWM3/PWM4 open) modes.
What is the purpose of the OFS and OFSOUT pins on the ISL6556BCRZA-T?
The OFS pin sets the polarity and magnitude of a DC offset current using an external resistor to GND or VCC; OFSOUT (QFN-only) delivers that current to the FB pin. This enables independent adjustment of the load-line droop voltage without affecting the VID-set reference, allowing fine-tuning of AVP slope for specific MOSFET rDS(ON) characteristics - a capability absent in SOIC variants.
Does the ISL6556BCRZA-T require external components for overvoltage protection?
No, the ISL6556BCRZA-T provides complete overvoltage protection without external components: its OVP pin detects +200 mV above VID and latches low, capable of sinking >100 mA at 1.9 V to directly drive an external SCR or MOSFET crowbar circuit. The threshold is fixed and does not require resistor dividers or comparators, as confirmed in Electrical Specifications (Page 8) and Functional Pin Description (Page 9).
ISL6556BCRZA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 32-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:
- 32-QFN (5x5)
ISL6556BCRZA-T FAQ
1.How can I place an order for ISL6556BCRZA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6556BCRZA-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 ISL6556BCRZA-T reliable?
The price and inventory of ISL6556BCRZA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6556BCRZA-T is usually 5 days.
3.What payment methods are accepted for ISL6556BCRZA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6556BCRZA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6556BCRZA-T?
ISL6556BCRZA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6556BCRZA-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 ISL6556BCRZA-T?
For technical support, including ISL6556BCRZA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6556BCRZA-T requirements.
6.How does Aetrix verify that ISL6556BCRZA-T is sourced from the original manufacturer or authorized distributors?
All ISL6556BCRZA-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 ISL6556BCRZA-T meets industry standards.
7.What is the process for return or replacement of ISL6556BCRZA-T?
All ISL6556BCRZA-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6556BCRZA-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 ISL6556BCRZA-T part is unused and in its original packaging.
Return procedure for ISL6556BCRZA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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