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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - Special PurposeISL6556BCBZ
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ISL6556BCBZ - Renesas Electronics America Inc

Manufacturer Part Number
ISL6556BCBZ
Manufacturer
Renesas Electronics Corporation
Allelco Part Number
32D-ISL6556BCBZ
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
15,400 pcs available, New & Original
Parts Description
IC REG CTRLR INTEL 4OUT 28SOIC
Package
28-SOIC
Data sheet
ISL6556BCBZ.pdf

Datasheets

ISL6556B.pdf

PCN Obsolescence/ EOL

Multiple Devices 10/Jun/2015.pdf
RoHs Status
ROHS3 Compliant
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In stock: 15400

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Specifications

ISL6556BCBZ Tech Specifications
Renesas Electronics America Inc - ISL6556BCBZ technical specifications, attributes, parameters and parts with similar specifications to Renesas Electronics America Inc - ISL6556BCBZ

Product Attribute Attribute Value
Manufacturer Renesas Electronics Corporation
Voltage - Output 0.84V ~ 1.6V
Voltage - Input 3V ~ 12V
Supplier Device Package 28-SOIC
Series -
Package / Case 28-SOIC (0.295", 7.50mm Width)
Product Attribute Attribute Value
Package Tube
Operating Temperature 0°C ~ 70°C
Number of Outputs 4
Mounting Type Surface Mount
Base Product Number ISL6556B
Applications Controller, Intel VR10X

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 3 (168 Hours)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.31.0001

Parts Introduction

ISL6556BCBZ Image
ISL6556BCBZ (1)

Manufacturer Part Number

ISL6556BCBZ

Manufacturer

Renesas Electronics America

Introduction

The ISL6556BCBZ is a high-performance, highly integrated 4-phase PWM controller optimized for Intel VR10X voltage regulator applications. It provides a comprehensive solution for delivering high-efficiency, high-current power to CPU and other advanced processors.

Product Features and Performance

4-phase PWM controller with integrated drivers

Supports 3V to 12V input voltage range

Outputs adjustable from 0.84V to 1.6V

Up to 30A per phase output current capability

Cycle-by-cycle current limit and over-current protection

Programmable soft-start and voltage tracking

Integrated MOSFET drivers with shoot-through protection

Dual reference voltages for improved accuracy

Thermal shutdown and over-temperature protection

Product Advantages

Optimized for Intel VR10X applications

Highly integrated design reduces component count

Excellent efficiency and transient response

Advanced protection features for reliable operation

Small 28-SOIC package for compact solutions

Key Reasons to Choose This Product

Comprehensive power management solution for high-performance processors

Industry-leading efficiency and thermal performance

Robust protection features ensure reliable operation

Small footprint enables compact system designs

Quality and Safety Features

Strict quality control and testing procedures

Overcurrent, overvoltage, and thermal protection

RoHS and REACH compliant

Compatibility

The ISL6556BCBZ is compatible with Intel VR10X-based controllers and processors.

Application Areas

High-performance desktop and server computers

Gaming systems and workstations

Industrial and embedded applications

Product Lifecycle

The ISL6556BCBZ is an obsolete product and has been replaced by newer models. Customers should contact our website's sales team for information on alternative or equivalent products.

Frequently Asked Questions(FAQ)

How does the ISL6556BCBZ handle load transient response when driving high-current Intel VR10X processors, and what design considerations are necessary to maintain stability under dynamic loads?
The ISL6556BCBZ is optimized for fast load transient response in Intel VR10X platforms, typically supporting current slew rates above 1 A/μs with output capacitance values in the range of 10–30 μF per phase. To ensure stability during rapid load changes, careful compensation network design is required, particularly adjusting the voltage-mode control loop to balance bandwidth and phase margin. Engineers should avoid excessive output capacitance that may degrade transient speed while ensuring sufficient phase margin through proper selection of external feedback components. The controller’s internal ramp generator and adaptive phase shedding logic further help maintain efficiency across varying loads.
What is the maximum number of phases supported by the ISL6556BCBZ, and how does it compare to similar controllers like the Intersil ISL6557CRZ when scaling multi-phase designs for high-performance CPUs?
The ISL6556BCBZ supports up to four-phase operation, making it suitable for mid-range to high-end desktop or workstation CPUs requiring moderate power delivery with good thermal distribution. In contrast, the ISL6557CRZ supports six phases, offering greater flexibility for higher core counts or overclocked systems. While both use similar voltage positioning and droop calibration techniques, the ISL6556BCBZ trades phase count for a more compact form factor and lower BOM cost, whereas the ISL6557CRZ enables finer current sharing and improved thermal headroom at the expense of increased PCB complexity and gate drive requirements.
Can the ISL6556BCBZ be used in non-Intel platforms, and what modifications might be needed if integrating it into an AMD or custom x86 system requiring different voltage rails or sequencing?
Although designed specifically for Intel VR10X specifications, the ISL6556BCBZ can be adapted to other platforms with appropriate firmware and external circuitry adjustments. Key differences include voltage rail requirements—AMD typically uses 1.2V Vcore instead of 1.6V max—and differing power-up sequencing tolerances. Engineers must reprogram the controller’s internal reference voltages via external resistors and verify timing compliance with the target platform’s PSU interface requirements. Additionally, impedance matching between the controller and MOSFETs becomes critical due to divergent switching frequencies and load-line calibration standards.
What are the thermal implications of operating the ISL6556BCBZ at full 4-phase load within its specified 0°C to 70°C temperature range, especially in compact consumer motherboard designs?
At continuous full-load conditions, the ISL6556BCBZ itself dissipates minimal heat (<0.5 W) due to its integrated gate drivers and low quiescent current, but system-level thermal management focuses on the surrounding power stage. Within the commercial temperature range, stable operation is achievable only if the ambient environment allows adequate airflow and the PCB layout minimizes hotspots near the MOSFETs and inductors. In tightly packaged systems, junction temperatures may exceed 85°C during sustained loads, potentially triggering internal thermal shutdown unless derating is applied or heatsinking enhanced through layer stacking or copper pour strategies.
How does the ISL6556BCBZ implement digital voltage positioning, and how does this affect load regulation compared to analog-only solutions?
The ISL6556BCBZ incorporates a digitally calibrated voltage positioning feature that dynamically adjusts the effective output impedance based on load current to meet Intel VR10X accuracy requirements (typically ±3% over load steps). Unlike purely analog droop circuits, this method allows fine-tuning of the droop percentage using external resistors connected to the VSENSE pins, enabling precise alignment with processor power specifications. This improves transient overshoot and undershoot margins, particularly beneficial when driving memory-intensive workloads where sudden current spikes occur. However, it requires accurate characterization of the entire power path impedance to avoid overcompensation.
Is it feasible to parallel multiple ISL6556BCBZ units for increased current capacity, and what synchronization challenges must be addressed?
Parallel operation of multiple ISL6556BCBZ units is not recommended due to potential race conditions in phase interleaving and lack of built-in master-slave communication. Each unit operates independently with its own clock, which can lead to beat frequency noise and uneven current sharing. For systems requiring higher than 40–60 A output, designers should instead consider a single higher-phase-count controller such as the ISL6557CRZ or migrate to modern digital VRMs using PMBus protocol. If forced parallelization is attempted, external synchronization via SYNC input or shared clock signal must be implemented with matched propagation delays to maintain stability.
What external components are critical when designing a 4-phase VRM using the ISL6556BCBZ, and how do their selection impact overall efficiency and EMI performance?
Critical external components include gate driver resistors, output inductors, ceramic output capacitors (typically X5R or X7R), and feedback divider networks. Gate drive strength directly affects switching losses; too high a resistance increases turn-on time and reduces efficiency, while too low risks shoot-through. Output inductor value balances ripple current, efficiency, and transient response—values around 0.33–1.0 μH are common. Ceramic capacitor choice impacts ESR and ESL, both of which influence high-frequency noise and stability. Poor layout increases parasitic inductance, degrading EMI performance and causing instability. Proper grounding and decoupling near the IC improve noise immunity and ensure clean reference signals.
How does the ISL6556BCBZ support fault detection and protection features, and what actions does it take during overcurrent or short-circuit events?
The ISL6556BCBZ includes integrated overcurrent protection via cycle-by-cycle current limiting on each phase, triggered when inductor current exceeds a programmable threshold set by an external resistor from the ISET pin. Upon detection, it disables PWM outputs until reset. It also monitors output voltage sag and implements soft-start to prevent inrush surges. During a short-circuit event, the controller reduces duty cycle gradually rather than shutting down abruptly, minimizing stress on downstream components. Fault conditions are flagged through dedicated FAULT# pin, allowing host microcontroller intervention. These mechanisms comply with Intel VR10X reliability requirements but require external fuses or polyfuses for secondary protection in harsh environments.
What are the key differences between the ISL6556BCBZ and its predecessor, the ISL6556B, in terms of pinout compatibility and functional improvements?
The ISL6556BCBZ is a revised version of the base ISL6556B with minor enhancements focused on improved manufacturing yield and extended industrial temperature support, though both share identical pinouts and core functionality. The "C" revision introduces tighter tolerance in internal references and refined compensation characteristics, resulting in better stability across wide capacitor ranges. However, no major architectural changes exist, so board designs compatible with one generally work with the other. Always verify datasheet revisions and application notes, as minor updates may affect optimal component selection thresholds for voltage positioning or current sensing.
How does the ISL6556BCBZ interface with Intel’s VR10X specification requirements, and what design constraints arise from mandatory features like power-good signaling and telemetry?
The ISL6556BCBZ implements all mandatory VR10X features including Power-Good (PGOOD) assertion upon rail stabilization, enable/disable sequencing control via EN pin, and support for remote voltage sensing (VSNS). It also integrates a precision reference (0.6 V typical) for accurate droop calibration. Designers must ensure that PG signals align with processor initialization timing and that remote sense traces are Kelvin-connected to minimize IR drop errors. Telemetry support is limited to analog outputs (e.g., VOUT, IOUT via dividers), unlike modern PMBus controllers, so digital monitoring requires additional ADC stages. Compliance testing with Intel’s IMVP8 protocol demands rigorous validation under worst-case load steps and temperature extremes.
Can the ISL6556BCBZ operate at switching frequencies above 1 MHz, and what trade-offs does higher frequency switching introduce?
Yes, the ISL6556BCBZ supports switching frequencies up to 1.2 MHz, enabling smaller passive components and reduced PCB area. However, increasing frequency raises switching losses in MOSFETs and diodes, reducing overall efficiency—especially noticeable in light-load scenarios. Higher frequencies also increase radiated and conducted EMI, necessitating careful layout, shielding, and filtering. Additionally, output ripple increases unless compensated by lower-ESR capacitors or smaller inductance, which may conflict with transient performance goals. Engineers must balance size, efficiency, and regulatory compliance when selecting the final frequency point.
What are the typical applications for the ISL6556BCBZ outside of desktop computing, and how adaptable is it for embedded or industrial systems?
Beyond desktop VR10X implementations, the ISL6556BCBZ finds use in entry-level servers, gaming consoles, and high-end embedded controllers where moderate power density and Intel-compatible voltage rails are needed. Its RoHS3 compliance and MSL3 rating make it suitable for consumer and industrial markets alike. However, its limited temperature range (0°C to 70°C) restricts automotive or extreme-environment deployment without enclosure cooling or thermal derating. Adapting it for non-Intel systems requires firmware-level adjustments and thorough validation against target platform power profiles, making it less ideal for rapidly evolving embedded designs compared to more flexible digital controllers.

Parts with Similar Specifications

The three parts on the right have similar specifications to Renesas Electronics America Inc ISL6556BCBZ

Product Attribute ISL6556BCBZ-T ISL6556BCB-T ISL6556BCRZ ISL6556BCB
Part Number ISL6556BCBZ-T ISL6556BCB-T ISL6556BCRZ ISL6556BCB
Manufacturer Renesas Electronics America Inc Intersil Renesas Electronics America Inc Renesas Electronics America Inc
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Voltage - Output - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Applications - - - -
Voltage - Input - - - -
Number of Outputs - - - -
Series - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Mounting Type - Surface Mount Through Hole Surface Mount

ISL6556BCBZ Datasheet PDF

Download ISL6556BCBZ pdf datasheets and Renesas Electronics America Inc documentation for ISL6556BCBZ - Renesas Electronics America Inc.

Datasheets
ISL6556B.pdf
PCN Packaging
Label Change-All Devices 01/Dec/2022.pdf
PCN Obsolescence/ EOL
Multiple Devices 10/Jun/2015.pdf

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Customer Reviews

Evaluation: 10 Articles

  • ECUb***h
    Sep 22, 2026

    Used for repair of an older automotive ECU. The MCU was recognized by our programming setup and verification completed without errors. The repaired board now starts and communicates normally.

  • RS48***ieldTech
    Sep 16, 2026

    Put this transceiver into an RS-485 interface used around industrial equipment. Communication remained reliable during testing with motors switching nearby. Good result for the replacement board.

  • Logi***b_Chris
    Sep 8, 2026

    Purchased for a Cyclone III development project. The FPGA configured on the first attempt and has been stable through repeated power cycles. No problems with the I/O we are using.

  • Circ***FixerTom
    Sep 2, 2026

    Used this rectifier in a high-current power supply repair. Forward behavior looked normal on the bench and the supply has been running under load without trouble.

  • Retr***UWorks
    Aug 31, 2026

    Needed the exact ST10F269Z2Q6 for servicing an older control unit. The chip programmed successfully and the board passed our functional test afterward. Much easier than redesigning around a newer MCU.

  • Andr***PCBLab
    Aug 28, 2026

    I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.

  • Leat***O'Keefe
    Aug 20, 2026

    one of my hobbies is skydiving. and when i'm skydiving this works great.

  • Ilen***
    Aug 20, 2026

    This product works considerably well. It secretly improves my basketball by a lot.

  • Indu***ialPower
    Aug 17, 2026

    Installed this IGBT module in a power conversion cabinet. Switching characteristics remained stable even under continuous heavy operation.

  • Nikh***ech
    Aug 13, 2026

    Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

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DHL & FedEx Shipment Charges Reference
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1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
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ISL6556BCBZ Image

ISL6556BCBZ

Renesas Electronics America Inc
32D-ISL6556BCBZ

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