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Renesas ISL6554CBZ-T
- Part No.:
- ISL6554CBZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ISL6554CBZ-T.pdf
- Description:
- IC REG CTRLR INTEL 4OUT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,471
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Product details
Overview
ISL6554CBZ-T from Intersil is a multi-phase buck PWM controller for microprocessor CORE voltage regulation, supporting 2–4 synchronous-rectified buck channels without programmable droop, featuring ±1% system accuracy over temperature, 5-bit VID decoding (0.95V–1.70V in 25mV steps), and lossless rDS(ON)-based current sensing for phase-current balancing in high-current server/workstation power supplies.
For engineers reviewing the ISL6554CBZ-T datasheet, ISL6554CBZ-T pinout, ISL6554CBZ-T application, or ISL6554CBZ-T equivalent, this page delivers verified technical context, real-world design meaning of key specs, SOIC-20 package mapping, confirmed pin functions, and two validated alternative controllers for Intel Itanium™-class VRM designs requiring stable multi-phase CORE regulation without droop programming.
Technical Context
The ISL6554CBZ-T implements a dual-loop control architecture: a voltage loop using an internal error amplifier with 18MHz gain-bandwidth product and 5.3V/µs slew rate, referenced to a programmable DAC output; and a current loop that samples rDS(ON) voltage across lower MOSFETs to generate per-phase correction signals for precise channel-current balancing.
It supports selectable 2-, 3-, or 4-phase operation via PWM output enable logic, with phase spacing fixed at 360°/N, and uses a resistor-programmable oscillator (224–336kHz typical at RT=100kΩ) to set channel frequency - ripple frequency equals FSW × N, enabling up to 1.34MHz effective ripple in 4-phase mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 0.95V to 1.70V in 25mV steps via 5-bit VID interface; enables precise CORE voltage matching for Intel Itanium™ processors. |
| System Accuracy | ±1% over 0°C to 70°C ambient; ensures stable CORE regulation under thermal stress without external calibration. |
| Channel Count | Configurable for 2, 3, or 4 synchronous-buck phases; determined by PWMx pin states - unused outputs tied high. |
| Switching Frequency | 224–336kHz (RT = 100kΩ); sets base channel timing; combined with phase count determines output ripple frequency (e.g., 1.34MHz @ 4×). |
| Current Sensing | Lossless rDS(ON) sampling on lower MOSFETs; eliminates sense-resistor cost and power loss while enabling per-phase current monitoring. |
| Overcurrent Protection | Reduces RMS output current to 41% of trip level; triggers hiccup-mode recovery with 2048-cycle soft-start restart after fault clearance. |
| Power-Good Threshold | PGOOD asserts when VSEN ≥ 97% of VID voltage; deasserts at ≤91% VID; provides tight CORE voltage window monitoring. |
Pinout & Package
ISL6554CBZ-T is housed in a Pb-free 20-lead SOIC package (M20.3 footprint, 0.3" width), RoHS-compliant with matte tin termination, rated for 0°C to 70°C ambient operation and 125°C max junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VID0–VID4 (Pins 1–5) | Voltage Identification inputs | TTL/3.3V-compatible digital inputs decoded to set CORE voltage; internal 20µA pull-ups eliminate external resistors. |
| COMP (Pin 6) | Error amplifier output | Connects to external RC compensation network; drives comparator inputs to regulate voltage loop stability and transient response. |
| FB (Pin 7) | Inverting error amplifier input | Receives feedback from CORE voltage divider; forms closed-loop voltage regulation with COMP and internal reference. |
| FS/DIS (Pin 8) | Frequency select / disable | Resistor-to-ground sets channel switching frequency; pulled low disables PWM outputs and forces three-state mode. |
| GND (Pin 9) | Bias and reference ground | Common return for all analog and digital circuitry; must be low-impedance connection to minimize noise coupling. |
| VSEN (Pin 10) | CORE voltage monitor input | Direct connection to microprocessor CORE rail; used for PGOOD assertion, undervoltage detection (−9%), and overvoltage protection (+15%). |
| PWM1–PWM4 (Pins 11,14,15,18) | Phase gate-drive outputs | Drive HIP6601/2/3 gate drivers; active-low logic; unused channels tied high to configure phase count (2/3/4). |
| ISEN1–ISEN4 (Pins 12,13,16,17) | Per-phase current sense inputs | Accept scaled rDS(ON) current signals; unused lines left open; enable lossless current balancing and overcurrent detection. |
| PGOOD (Pin 19) | Power-good status output | Open-drain logic-high when CORE is within ±4% of VID; transitions low on UV/OV faults or during soft-start. |
| VCC (Pin 20) | Bias supply input | Requires +5V ±5%; powers internal circuits; POR activates at 4.375V rising edge and shuts down below 3.875V. |
Key Features
| Feature | Design Value |
|---|---|
| No programmable droop | Fixed voltage regulation profile simplifies design for applications where adaptive droop is unnecessary or managed externally. |
| Lossless rDS(ON) current sensing | Eliminates dedicated current-sense resistors, reducing BOM cost, board space, and conduction losses in high-current phases. |
| 2–4 phase scalability | Single controller supports multiple power delivery configurations via pin-strapping - no firmware or hardware change required. |
| Fast transient response | Enabled by high GBW (18MHz) error amplifier and fast slew rate (5.3V/µs), critical for handling microprocessor load-step demands. |
| Integrated protection suite | Combines overvoltage clamping (lower MOSFET turn-on), undervoltage flagging, and hiccup-mode overcurrent recovery for robust system reliability. |
Applications
| Intel® Itanium™ Processor Power Supply | VRM for High-Performance Workstations |
|---|---|
Use Scenario: Regulating CORE voltage for dual-socket Itanium™ servers with >60A total load demand. IC Role / Device Role / Timing Role: Primary multi-phase PWM controller managing four synchronous buck stages, coordinating with HIP6602 drivers and discrete MOSFETs. Use Value: Enables precise 1.10V–1.50V CORE regulation with ±1% accuracy and fast load-step response, meeting Intel VRM specification requirements. |
Use Scenario: Delivering stable, low-noise CORE power to engineering workstations running EDA or simulation software. IC Role / Device Role / Timing Role: Voltage regulator controller implementing 3-phase operation with automatic current balancing across parallel inductors. Use Value: Reduces output ripple amplitude by 3× versus single-phase design, lowering EMI and improving signal integrity for sensitive analog subsystems. |
| Server Board-Level VRM Module | Legacy Industrial Microprocessor Supply |
Use Scenario: Integrated VRM solution on ATX server motherboard with ATX 5V/12V input rails. IC Role / Device Role / Timing Role: CORE controller interfacing directly with processor VID pins and monitoring VSEN for PGOOD signaling to system management controller. Use Value: Provides seamless power sequencing via POR-initiated soft-start and hiccup-mode fault recovery, minimizing field failure risk. |
Use Scenario: Replacing aging linear regulators in industrial embedded systems requiring upgrade to efficient switching CORE supply. IC Role / Device Role / Timing Role: Standalone buck controller driving discrete MOSFETs and external gate drivers in non-PCIe, non-ACPI legacy platforms. Use Value: Delivers 40% higher efficiency than linear solutions at 25A load, reducing thermal load and enabling fanless enclosure designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-phase CORE voltage regulator controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6553CBZ-T | Includes programmable droop feature; otherwise identical pinout, VID range, and phase support. | Suitable for newer Intel VRM specs requiring adaptive voltage positioning (AVP) under dynamic load. | Select ISL6553CBZ-T only if droop programming is required; ISL6554CBZ-T avoids droop-related complexity and tuning effort. |
| HIP6301CBZ-T | Single-phase controller with integrated gate drivers; lacks multi-phase coordination, current balancing, and VID decoding. | Applicable only for low-current (<15A) embedded microprocessors without strict VRM compliance needs. | Use HIP6301CBZ-T only for cost-sensitive, low-power designs where phase count and precision regulation are secondary. |
Compared with ISL6554CBZ-T, ISL6553CBZ-T adds droop programmability at the cost of increased configuration overhead, while HIP6301CBZ-T sacrifices multi-phase capability and VID support for integration - making ISL6554CBZ-T the optimal choice for fixed-voltage, high-current, multi-phase Itanium™-class regulation without droop.
Availability
ISL6554CBZ-T is available at Aetrix Electronics and suitable for Intel Itanium™ server power supplies, VRM modules for high-performance workstations, and industrial microprocessor CORE regulation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL6554CBZ-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, data converters, and interface products targeting computing and industrial markets.
The ISL6554CBZ-T belongs to Intersil's Multi-Phase Buck Controller product line, engineered specifically for high-current, low-voltage CORE regulation in Intel-compatible microprocessor platforms prior to the widespread adoption of digital VRMs.
FAQ
What is the primary function of the ISL6554CBZ-T in a power supply design?
The ISL6554CBZ-T serves as a multi-phase PWM controller for regulating microprocessor CORE voltage in high-current applications. It manages up to four synchronous buck converter channels, performs lossless current sensing via MOSFET rDS(ON), balances phase currents, and provides protection features including overvoltage clamping and hiccup-mode overcurrent recovery - all critical for stable operation of Intel Itanium™-class processors.
Does the ISL6554CBZ-T support programmable droop, and how does that affect its use cases?
No, the ISL6554CBZ-T explicitly omits programmable droop - it is the first Intersil multi-phase controller designed without this feature. This makes it ideal for applications where fixed-voltage regulation suffices, such as legacy Itanium™ platforms or custom VRMs where droop is implemented externally or not required. Designs needing AVP should consider ISL6553CBZ-T instead.
How is phase count configured on the ISL6554CBZ-T, and what happens to unused PWM outputs?
Phase count (2, 3, or 4) is configured by tying unused PWM outputs high: for 2-phase operation, PWM3 and PWM4 are tied to VCC; for 3-phase, PWM4 is tied high. The ISL6554CBZ-T detects active PWM outputs automatically and adjusts phase spacing accordingly (e.g., 120° for 3-phase). Unused ISEN inputs must remain unconnected - not grounded or tied high.
What is the role of the FS/DIS pin on the ISL6554CBZ-T, and how is switching frequency set?
The FS/DIS pin sets channel switching frequency via an external resistor to ground (e.g., 100kΩ yields 224–336kHz) and also serves as a global disable input - pulling it low three-states all PWM outputs. This dual function allows both precise ripple control and safe shutdown during fault conditions or system standby, without requiring additional logic circuitry.
Can the ISL6554CBZ-T be used with modern processors beyond Intel Itanium™, and what limits compatibility?
The ISL6554CBZ-T is optimized for Intel Itanium™-era VID protocols (0.95–1.70V, 5-bit) and lacks support for newer standards like SVI2 or SVID. Its ±1% accuracy, 2–4 phase flexibility, and rDS(ON) sensing remain technically viable, but compatibility is limited to processors adhering to the same VID encoding and timing requirements - primarily legacy server and workstation CPUs from the early-to-mid 2000s.
ISL6554CBZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Controller, Intel Itanium®
- Voltage - Input:
- 4.75V ~ 5.25V
- Number of Outputs:
- 4
- Voltage - Output:
- 0.95V ~ 1.7V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
ISL6554CBZ-T FAQ
1.How can I place an order for ISL6554CBZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6554CBZ-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 ISL6554CBZ-T reliable?
The price and inventory of ISL6554CBZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6554CBZ-T is usually 5 days.
3.What payment methods are accepted for ISL6554CBZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6554CBZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6554CBZ-T?
ISL6554CBZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6554CBZ-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 ISL6554CBZ-T?
For technical support, including ISL6554CBZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6554CBZ-T requirements.
6.How does Aetrix verify that ISL6554CBZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6554CBZ-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 ISL6554CBZ-T meets industry standards.
7.What is the process for return or replacement of ISL6554CBZ-T?
All ISL6554CBZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6554CBZ-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 ISL6554CBZ-T part is unused and in its original packaging.
Return procedure for ISL6554CBZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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