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Renesas ISL6556BCBZ-T
- Part No.:
- ISL6556BCBZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ISL6556BCBZ-T.pdf
- Description:
- IC REG CTRLR INTEL 4OUT 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,145
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Product details
Overview
ISL6556BCBZ-T 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, 6-bit VID input (0.8375V–1.600V in 12.5mV steps), programmable internal temperature compensation, and differential remote voltage sensing. It supports 2/3/4-phase operation up to 1.5MHz per phase and delivers ±0.5% system accuracy over temperature and life.
For engineers reviewing the ISL6556BCBZ-T datasheet, ISL6556BCBZ-T pinout, ISL6556BCBZ-T application, or ISL6556BCBZ-T equivalent, key selection considerations include phase configuration flexibility (via PWM3/PWM4 strapping), adaptive droop implementation using ISEN inputs, thermal compensation tuning via TCOMP, and compatibility with Intersil MOSFET drivers such as HIP6601B in high-current CPU power delivery systems.
Technical Context
The ISL6556BCBZ-T implements interleaved multi-phase control with configurable 2-, 3-, or 4-phase operation determined by PWM3 and PWM4 logic states. Its rDS(ON)-based current sensing architecture enables adaptive voltage positioning (AVP/droop), channel-current balancing, and overcurrent protection without external sense resistors.
It integrates a 6-bit DAC for dynamic VID™ voltage identification, a unity-gain differential remote-sense amplifier (VDIFF/VSEN/RGND), and an internal shunt regulator supporting both 5V and 12V biasing. The controller uses a sawtooth-based PWM comparator with programmable switching frequency (0.08–1.5MHz via FS resistor) and includes dedicated OVP, PGOOD, and EN/ENLL enable logic for precise sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Range | 0.8375V–1.600V in 12.5mV steps; sets microprocessor core VDD via 6-bit VID interface |
| Phase Support | Configurable 2-, 3-, or 4-phase operation; PWM3/PWM4 strapping selects active channel count |
| Switching Frequency | 0.08–1.5MHz per phase; set by external resistor on FS pin, enabling high-frequency ripple reduction |
| System Accuracy | ±0.5% over temperature and life (VID = 1.2V–1.6V); ensures stable core voltage under load transients |
| rDS(ON) Sensing | Lossless current sensing per phase; enables droop programming, channel balancing, and OCP without shunts |
| Temperature Compensation | Programmable via TCOMP pin; nullifies rDS(ON) drift with temperature to maintain droop accuracy |
| Remote Sensing | Differential VSEN/RGND inputs with VDIFF output; eliminates PCB IR drop errors in high-current CPU rails |
Pinout & Package
ISL6556BCBZ-T is housed in a 28-lead SOIC package (JEDEC MS-013AA, M28.3 drawing), with exposed pad not present - distinct from the QFN variant ISL6556BCRZ. Thermal resistance θJA is 60°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Accepts 5V direct or 12V via 300Ω resistor; internal shunt regulator clamps at 6.02V max |
| EN | Threshold-sensitive enable | Active-high at 1.24V; coordinates startup with MOSFET drivers; fault reset at 1.14V |
| VID0–VID4, VID12.5 | Digital voltage ID inputs | 6-bit bus (VID12.5 = MSB) decoding DAC reference; supports Dynamic VID™ for on-the-fly voltage changes |
| ISEN1–ISEN4 | Per-phase current sense inputs | Virtual-ground inputs measuring lower-MOSFET rDS(ON) voltage; used for droop, balancing, and OCP |
| PWM1–PWM4 | Phase gate-drive outputs | CMOS-compatible PWM signals; phase count configured by strapping PWM3/PWM4 to VCC or GND |
| VDIFF, VSEN, RGND | Remote-sense amplifier interface | VSEN/RGND accept differential load voltage; VDIFF feeds error amp for accurate regulation |
| TCOMP | Temperature compensation scaling | Resistor-to-ground sets transconductance (1μA/V/°C); adjusts droop current vs. MOSFET junction temp |
| OFS | Offset current programming | Generates DC offset current into FB; polarity selected by connecting to GND (negative) or VCC (positive) |
| PGOOD | Power-good indicator | Open-drain output asserting after soft-start completion; pulled low on undervoltage (74% of VID) |
| OVP | Overvoltage protection trigger | Open-drain latch output; drives external crowbar device when VSEN exceeds VID + 200mV |
Key Features
| Feature | Design Value |
|---|---|
| Differential remote sensing | Eliminates PCB trace IR drop error by referencing feedback directly at CPU VDD/VSS pins |
| Programmable temperature compensation | Nullifies rDS(ON) drift across 0°C–105°C junction range, preserving droop slope accuracy |
| Dynamic VID™ technology | Enables seamless real-time VID changes during operation without output disruption or re-sequencing |
| Lossless rDS(ON) current sensing | Removes need for discrete current-sense resistors, reducing BOM cost and board space in high-current phases |
| Configurable multi-phase topology | Hardware-selectable 2/3/4-phase operation via PWM3/PWM4 strapping - no firmware or register writes required |
Applications
| Server CPU Core Power | Workstation GPU Core Rail |
|---|---|
Use Scenario: Regulating core voltage for dual-socket Xeon Scalable processors under dynamic 200A+ load transients. IC Role / Device Role / Timing Role: Primary multi-phase PWM controller coordinating up to four HIP6601B driver ICs, managing droop, current balance, and OVP. Use Value: Achieves ±0.5% output accuracy while reducing output capacitance by >40% versus single-phase designs via 4× ripple frequency multiplication. | Use Scenario: Delivering tightly regulated 0.85V–1.2V core power to NVIDIA A100 GPU modules in AI inference servers. IC Role / Device Role / Timing Role: VR10.x-compliant controller implementing adaptive voltage positioning with temperature-compensated rDS(ON) sensing per phase. Use Value: Maintains stable droop slope across -40°C to +85°C ambient, preventing thermal runaway during sustained compute loads. |
| High-End Desktop Motherboard VRM | Network Processor SoC Supply |
Use Scenario: Supporting AMD Ryzen Threadripper CPUs with rapid VID transitions during Precision Boost 2 frequency scaling. IC Role / Device Role / Timing Role: Dynamic VID™-enabled controller updating DAC reference in <10μs per VID change, synchronized with CPU command timing. Use Value: Enables sub-5μs voltage settling time during boost events, eliminating performance throttling due to slow rail response. | Use Scenario: Powering multi-core network processors (e.g., Marvell OCTEON) requiring 1.0V/60A core rail with strict sequencing and fault logging. IC Role / Device Role / Timing Role: Sequenced controller using EN and ENLL inputs to coordinate with companion PMICs and assert PGOOD only after all rails stabilize. Use Value: Integrates OVP latch and PGOOD with undervoltage detection (74% VID threshold), meeting Telco GR-63-CORE reliability requirements. |
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 | 32-lead 5×5mm QFN package; adds ENLL pin and OFSOUT output; θJA = 32°C/W vs. SOIC's 60°C/W | Preferred for space-constrained, thermally demanding layouts where lower thermal resistance is critical | Select ISL6556BCRZ when PCB area is limited and thermal performance must be maximized; not pin-compatible with ISL6556BCBZ-T |
| RT8803AZSP | 6-phase capable; integrated MOSFET drivers; no TCOMP pin; ±1.0% system accuracy vs. ±0.5% | Targets higher-phase-count, lower-cost VRMs where integrated drivers reduce component count | Choose RT8803AZSP for new 6-phase designs prioritizing integration and cost; requires redesign for ISL6556BCBZ-T replacement |
Compared with ISL6556BCRZ, ISL6556BCBZ-T offers SOIC ease-of-handling and legacy footprint compatibility but higher thermal resistance; versus RT8803AZSP, it provides superior accuracy and dedicated temperature compensation at the cost of external driver dependency and lower phase count.
Availability
ISL6556BCBZ-T is available at Aetrix Electronics and suitable for server CPU core power, workstation GPU rails, high-end desktop VRMs, and network processor SoC supplies requiring stable component supply and long-term industrial availability.
Supply support for ISL6556BCBZ-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 Corporation (now part of Renesas Electronics) is a U.S.-based analog and power management IC designer known for high-performance voltage regulators and controllers targeting computing and communications infrastructure.
The ISL6556B product line was engineered specifically for VR10.x-compliant microprocessor core power delivery, emphasizing precision droop control, thermal stability, and seamless VID transitions in multi-phase buck converters.
FAQ
What is the maximum supported switching frequency per phase for the ISL6556BCBZ-T?
The ISL6556BCBZ-T supports a maximum switching frequency of 1.5MHz per phase, set by the resistor connected between the FS pin and ground. This high-frequency capability enables reduced output filter size and improved transient response in CPU core power applications. The ISL6556BCBZ-T maintains stable operation across the full 0.08–1.5MHz range with appropriate compensation network design.
Does the ISL6556BCBZ-T support Dynamic VID™ technology, and how does it function?
Yes, the ISL6556BCBZ-T implements Dynamic VID™ technology, allowing real-time, glitch-free changes to the output voltage reference during operation. The 6-bit VID bus (VID0–VID4, VID12.5) updates the internal DAC output without interrupting regulation. The ISL6556BCBZ-T uses internal sample-and-hold circuitry and REF pin filtering to ensure smooth transitions, supporting CPU frequency scaling protocols like Intel SpeedStep and AMD Cool'n'Quiet.
How is temperature compensation implemented in the ISL6556BCBZ-T, and why is it necessary?
The ISL6556BCBZ-T implements programmable temperature compensation via the TCOMP pin, which accepts a resistor-to-ground to scale internal thermal sensing current (1μA/V/°C). This compensates for rDS(ON) drift in lower MOSFETs across temperature, preserving the accuracy of adaptive voltage positioning (droop). Without this, droop slope would vary with junction temperature, risking instability or excessive voltage deviation under thermal load.
Can the ISL6556BCBZ-T operate with only two phases, and how is this configured?
Yes, the ISL6556BCBZ-T supports 2-phase operation by strapping the PWM3 pin to VCC; PWM4 remains unconnected or grounded. In this mode, PWM1 and PWM2 operate 180° out of phase, delivering interleaved ripple reduction. The ISL6556BCBZ-T automatically disables PWM3 and PWM4 outputs and adjusts current balancing and protection logic to monitor only the two active phases.
What is the purpose of the OFS pin on the ISL6556BCBZ-T, and how is it used?
The OFS pin on the ISL6556BCBZ-T generates a programmable DC offset current injected into the FB node to adjust the effective droop voltage independently of the VID setting. Connecting an external resistor from OFS to GND produces negative offset; connecting to VCC yields positive offset. This allows fine-tuning of load-line behavior for specific CPU power delivery requirements without altering the base VID reference voltage.
ISL6556BCBZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- 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:
- 28-SOIC
ISL6556BCBZ-T FAQ
1.How can I place an order for ISL6556BCBZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6556BCBZ-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 ISL6556BCBZ-T reliable?
The price and inventory of ISL6556BCBZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6556BCBZ-T is usually 5 days.
3.What payment methods are accepted for ISL6556BCBZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6556BCBZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6556BCBZ-T?
ISL6556BCBZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6556BCBZ-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 ISL6556BCBZ-T?
For technical support, including ISL6556BCBZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6556BCBZ-T requirements.
6.How does Aetrix verify that ISL6556BCBZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6556BCBZ-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 ISL6556BCBZ-T meets industry standards.
7.What is the process for return or replacement of ISL6556BCBZ-T?
All ISL6556BCBZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6556BCBZ-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 ISL6556BCBZ-T part is unused and in its original packaging.
Return procedure for ISL6556BCBZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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