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Renesas ISL6556BCRZ
- Part No.:
- ISL6556BCRZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ISL6556BCRZ.pdf
- Description:
- IC REG CTRLR INTEL 4OUT 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,623
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Product details
Overview
ISL6556BCRZ from Intersil is a multi-phase PWM controller for VR10.x microprocessor core voltage regulation, driving up to 4 synchronous-rectified buck channels with rDS(ON) current sensing, programmable temperature compensation, and 6-bit VID input (0.8375V–1.600V in 12.5mV steps). It supports 2/3/4-phase operation up to 1.5MHz per phase and integrates differential remote sensing for ±0.5% system accuracy over temperature and life.
For engineers reviewing the ISL6556BCRZ datasheet, ISL6556BCRZ pinout, ISL6556BCRZ application, or ISL6556BCRZ equivalent, key selection considerations include its QFN-32 package, ENLL logic-level enable, OFSOUT offset output, TCOMP temperature scaling input, and compatibility with HIP6601B MOSFET drivers in high-current CPU power delivery designs.
Technical Context
The ISL6556BCRZ implements interleaved multi-phase PWM control using a sawtooth-based modulator with programmable switching frequency (0.08–1.5MHz via FS resistor), adaptive voltage positioning via rDS(ON)-based current sensing, and dynamic VID™ for on-the-fly voltage changes. Its internal shunt regulator supports both 5V and 12V biasing.
It features a dedicated ENLL pin (QFN-only) for logic-level enable sequencing, OFSOUT for dc offset injection into FB, and TCOMP for temperature-dependent droop calibration. The controller uses four ISEN inputs for per-phase current sampling and closed-loop channel balancing, with fault detection including overvoltage (OVP pin), undervoltage (PGOOD), and overcurrent trip thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Range | 0.8375V–1.600V in 12.5mV steps via 6-bit VID interface; enables precise CPU core voltage selection per VR10.x spec. |
| Phase Support | Configurable 2-, 3-, or 4-phase operation; PWM3/PWM4 pins select topology without external logic. |
| Switching Frequency | 0.08–1.5MHz per phase (set by FS-to-ground resistor); higher frequencies allow smaller magnetics and tighter transient response. |
| System Accuracy | ±0.5% over temperature and life for VID = 1.2V–1.6V; ensures stable core voltage under thermal stress and aging. |
| Current Sensing | rDS(ON)-based per-phase sensing with programmable temperature compensation (TCOMP pin); eliminates need for sense resistors and reduces conduction loss. |
| Package | 32-pin QFN (5×5mm, JEDEC MO-220 QFN); near-chip-scale footprint improves PCB efficiency and thermal performance (θJA = 32°C/W). |
| Enable Logic | Dual-enable architecture: EN (threshold-sensitive) + ENLL (logic-level, QFN-only); enables precise power-up coordination with driver ICs. |
Pinout & Package
ISL6556BCRZ is housed in a 32-lead QFN package (JEDEC MO-220 QFN, 5×5mm body, exposed thermal pad). The package supports high-density layout and enhanced thermal dissipation (θJC = 3.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Accepts 5V direct or 12V via 300Ω limiting resistor; internal shunt regulator clamps at 6.2V max. |
| ENLL | Logic-level enable input | QFN-specific active-high enable (0.8V min high, 0.4V max low); clears faults and primes soft-start when deasserted. |
| OFSOUT | Offset current output | Drives FB pin with programmable dc current (±50µA); enables independent voltage offset adjustment without affecting VID setting. |
| TCOMP | Temperature compensation scaling | Resistor-to-ground sets transconductance (1µA/V/°C); nullifies rDS(ON) drift across operating temperature range. |
| PWM1–PWM4 | Phase control outputs | Open-drain PWM signals for MOSFET drivers; phase count determined by PWM3/PWM4 logic states. |
| ISEN1–ISEN4 | Per-phase current sense inputs | Virtual-ground inputs for rDS(ON) sensing; sampled current used for load-line regulation, balancing, and OCP. |
| VDIFF | Differential sense amplifier output | Single-ended representation of remote-sense voltage difference; feeds error amplifier for accurate regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Differential remote voltage sensing | Eliminates ground potential differences between controller and load; maintains ±0.5% regulation accuracy despite PCB IR drop. |
| Programmable internal temperature compensation | TCOMP pin adjusts droop current vs. temperature to counteract MOSFET rDS(ON) variation; preserves load-line accuracy across 0°C–105°C. |
| Dynamic VID™ technology | Enables seamless real-time VID changes during operation; supports CPU frequency scaling without output voltage glitch or reset. |
| Integrated shunt regulator | Allows direct 12V biasing with only a 300Ω series resistor; eliminates need for external LDO and simplifies power tree design. |
| Three-state PWM outputs | PWM1–PWM4 enter high-impedance state during fault conditions; prevents driver latch-up and enables safe recovery without power cycle. |
Applications
| Server CPU Power Delivery | Workstation GPU Core Regulation |
|---|---|
Use Scenario: Regulating core voltage for dual-socket Xeon processors in 1U rack servers with strict thermal and ripple constraints. IC Role / Device Role / Timing Role: Multi-phase PWM controller coordinating four HIP6601B drivers; manages interleaved timing, current balancing, and adaptive droop. Use Value: Reduces output ripple amplitude by 75% vs. single-phase, enabling smaller output capacitors and lower ESR requirements while maintaining <1% voltage deviation. | Use Scenario: High-current core rail (up to 40A) for professional-grade GPUs in CAD/rendering workstations. IC Role / Device Role / Timing Role: VR10.x-compliant controller implementing dynamic VID™ for GPU boost voltage transitions and TCOMP-based thermal compensation during sustained loads. Use Value: Maintains ±0.5% output accuracy across 0°C–105°C junction range, preventing thermal throttling due to voltage drift under full load. |
| Embedded AI Accelerator Supply | High-Performance Computing Node |
Use Scenario: Core voltage regulation for FPGA-based AI inference accelerators requiring rapid VID updates during workload shifts. IC Role / Device Role / Timing Role: Controller with ENLL sequencing and OFSOUT offset capability; synchronizes power-up with FPGA configuration and applies custom voltage offsets for process corner compensation. Use Value: Enables sub-100µs VID transitions with no overshoot, supporting real-time power management policies without software intervention. | Use Scenario: Multi-rail power system in HPC blade servers where multiple ISL6556BCRZ controllers regulate separate CPU cores with shared thermal monitoring. IC Role / Device Role / Timing Role: Primary VR controller interfacing with system PMBus manager via discrete enable/fault signaling (PGOOD, OVP, ENLL); provides traceable fault logs via latch behavior. Use Value: Integrated OVP pin drives external crowbar SCR without external comparators; reduces BOM count and improves overvoltage response time to <100ns. |
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 |
|---|---|---|---|
| ISL6556BCBZ | SOIC-28 package (vs. QFN-32); lacks ENLL and OFSOUT pins; no TCOMP temperature scaling; θJA = 60°C/W vs. 32°C/W. | Lower power density designs (<20A); less demanding thermal environments; no logic-level enable required. | Select ISL6556BCBZ only if board space allows SOIC footprint and thermal margin exceeds 25°C/W. |
| IR35201MTRPBF | 6-phase capable; integrated MOSFET drivers; digital PMBus interface; no analog VID or TCOMP; requires external EEPROM for configuration. | Systems needing programmable loop compensation, telemetry, or multi-rail coordination via digital bus. | Choose IR35201MTRPBF when digital control, telemetry, or >4-phase support is mandatory; not drop-in compatible with ISL6556BCRZ. |
Compared with ISL6556BCRZ, ISL6556BCBZ offers identical analog control architecture but sacrifices thermal performance and advanced features (ENLL, OFSOUT, TCOMP) for legacy SOIC compatibility, while IR35201MTRPBF replaces analog VID and temperature compensation with digital configurability and higher phase count-requiring firmware integration and layout redesign.
Availability
ISL6556BCRZ is available at Aetrix Electronics and suitable for server CPU power delivery, workstation GPU core regulation, embedded AI accelerator supply, and high-performance computing node applications requiring stable component supply, RoHS compliance, and long-term industrial availability.
Supply support for ISL6556BCRZ 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 Corporation (now part of Renesas Electronics) is a U.S.-based semiconductor company specializing in high-performance analog and power management ICs for computing, industrial, and communications markets.
The ISL6556B product line was designed specifically for VR10.x-compliant microprocessor core voltage regulation, emphasizing precision multi-phase control, adaptive droop, and seamless VID transitions in thermally constrained server and workstation platforms.
FAQ
What is the function of the ENLL pin on the ISL6556BCRZ?
The ENLL pin is a logic-level enable input exclusive to the QFN-packaged ISL6556BCRZ. It operates as an active-high signal (0.8V minimum for logic high) that, when asserted, enables the controller subject to internal POR and fault status. Deasserting ENLL clears all latched faults and primes the ISL6556BCRZ for soft-start upon re-enable. This pin provides precise sequencing control independent of the threshold-sensitive EN pin.
How does the ISL6556BCRZ implement temperature compensation for rDS(ON) current sensing?
The ISL6556BCRZ uses the TCOMP pin to apply programmable temperature scaling to its rDS(ON) current sensing circuitry. A resistor from TCOMP to ground sets a transconductance of 1µA/V/°C, generating a temperature-dependent current that adjusts the droop current injected into the FB pin. This compensates for MOSFET rDS(ON) drift across 0°C–105°C, preserving load-line accuracy without external components or calibration.
Can the ISL6556BCRZ be used with 12V bias instead of 5V?
Yes, the ISL6556BCRZ supports 12V bias via its integrated shunt regulator. Connect a 300Ω resistor between the 12V supply and the VCC pin; the internal regulator clamps VCC to 5.6–6.2V and sinks up to 25mA. This eliminates the need for an external LDO and simplifies power delivery in systems where only 12V is available, while maintaining full functionality including PWM generation and sensing.
What is the purpose of the OFSOUT pin on the ISL6556BCRZ?
The OFSOUT pin is the output of the ISL6556BCRZ's programmable offset-current generator and is unique to the QFN package. It sources or sinks up to ±50µA to the FB pin, creating a dc voltage offset across the droop resistor independent of the VID setting. This allows fine-tuning of the output voltage level-for example, to compensate for PCB trace resistance or process variations-without altering the DAC reference or affecting dynamic VID™ operation.
How does the ISL6556BCRZ achieve channel-current balancing across multiple phases?
The ISL6556BCRZ samples current via ISEN1–ISEN4 during forced-off time, computes the average current (IAVG) across active phases, then subtracts each channel's sampled current from IAVG to generate error currents. These errors filter into the COMP node, modifying the PWM duty cycle per phase to drive imbalance toward zero. This closed-loop method ensures equal current sharing across all active channels-even with mismatched MOSFETs or inductors-maximizing thermal efficiency and reliability.
ISL6556BCRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 32-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:
- 32-QFN (5x5)
ISL6556BCRZ FAQ
1.How can I place an order for ISL6556BCRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6556BCRZ 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 ISL6556BCRZ reliable?
The price and inventory of ISL6556BCRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6556BCRZ is usually 5 days.
3.What payment methods are accepted for ISL6556BCRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6556BCRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6556BCRZ?
ISL6556BCRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6556BCRZ 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 ISL6556BCRZ?
For technical support, including ISL6556BCRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6556BCRZ requirements.
6.How does Aetrix verify that ISL6556BCRZ is sourced from the original manufacturer or authorized distributors?
All ISL6556BCRZ 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 ISL6556BCRZ meets industry standards.
7.What is the process for return or replacement of ISL6556BCRZ?
All ISL6556BCRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6556BCRZ, 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 ISL6556BCRZ part is unused and in its original packaging.
Return procedure for ISL6556BCRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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