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Renesas ISL6554CB
- Part No.:
- ISL6554CB
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ISL6554CB.pdf
- Description:
- IC REG CTRLR INTEL 4OUT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,536
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Product details
Overview
ISL6554CB from Intersil is a multi-phase synchronous-buck PWM controller for microprocessor CORE voltage regulation, supporting 2–4 phases with lossless rDS(ON)-based current sensing, ±1% system accuracy over temperature, and 0.95V–1.70V digitally programmable output via 5-bit VID interface. It delivers fast transient response in server and workstation VRM applications.
For engineers reviewing the ISL6554CB datasheet, ISL6554CB pinout, ISL6554CB application, or ISL6554CB equivalent, key selection considerations include phase-count flexibility (2/3/4), absence of programmable droop, 224–336 kHz channel switching frequency (RT-set), overvoltage clamping protection, and compatibility with HIP6601A/HIP6602A/HIP6603A gate drivers.
Technical Context
The ISL6554CB implements dual-loop control: a voltage loop using FB/COMP feedback with internal 5-bit DAC reference, and a current loop sampling rDS(ON) voltage across lower MOSFETs to enable per-phase current balancing without external sense resistors. It uses a sawtooth-based PWM generator with phase-shifted outputs (360°/N) and integrated POR, soft-start, and fault latching.
Its protection architecture includes undervoltage detection (−9% VID), overvoltage shutdown with lower-MOSFET clamping (−15% VID hysteresis), and overcurrent limiting that reduces RMS output current to 41% of trip level. The FS/DIS pin sets channel frequency (224–336 kHz typical) and enables converter disable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 0.95V to 1.70V in 25mV steps via 5-bit VID; ±1% system accuracy ensures stable CORE voltage under thermal/voltage variation. |
| Phase Support | 2, 3, or 4 synchronous-buck channels; automatic detection via PWMx pin states (unused pins tied high). |
| Channel Frequency | 224–336 kHz (RT = 100kΩ); ripple frequency = FSW × N, enabling >1 MHz effective ripple suppression in 4-phase mode. |
| Current Sensing | Lossless rDS(ON) sampling on ISEN1–ISEN4; eliminates external sense resistors and associated power loss. |
| Protection Functions | Overvoltage latch (15% above VID), undervoltage PGOOD deassertion (−9% VID), and hiccup-mode overcurrent limiting (41% RMS reduction). |
| Supply & Temp Range | VCC = 5V ±5%; operating ambient: 0°C to 70°C; SOIC-20 package with θJA = 65°C/W. |
| PGOOD Threshold | Asserts when VSEN ≥ 97% of VID; deasserts at ≤91% VID - provides tight CORE voltage monitoring with hysteresis. |
Pinout & Package
ISL6554CB is housed in a 20-lead SOIC package (M20.3 footprint, RoHS-compliant Pb-free option available). Pin functions are validated per FN9003 Rev 3.00 datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VID0–VID4 (Pins 1–5) | Voltage Identification inputs | TTL/3.3V-compatible digital interface decoding 5-bit VID code to set CORE voltage; internal 20µA pull-ups eliminate external resistors. |
| COMP (Pin 6) | Error amplifier output | Connects to external RC compensation network; drives PWM comparators with 18 MHz GBD and 5.3 V/µs slew rate. |
| FB (Pin 7) | Inverting error amplifier input | Receives scaled CORE voltage feedback; forms closed-loop regulation with COMP and internal DAC reference. |
| FS/DIS (Pin 8) | Frequency select / disable | Resistor-to-ground sets channel frequency; pulled low disables PWM outputs and forces three-state condition. |
| GND (Pin 9) | Bias and reference ground | Common return for all analog/digital signals; must be low-impedance connection to minimize noise coupling. |
| VSEN (Pin 10) | CORE voltage monitor input | Direct connection to microprocessor CORE rail; triggers PGOOD assertion and UV/OV protection thresholds. |
| PWM1–PWM4 (Pins 11,14,15,18) | Phase PWM outputs | Drive HIP6601/2/3 gate drivers; phase spacing = 360°/N; unused outputs tied high to configure active channel count. |
| ISEN1–ISEN4 (Pins 12,13,16,17) | Per-phase current sense inputs | Accept lossless rDS(ON) voltage samples; unused lines left open per datasheet requirement. |
| PGOOD (Pin 19) | Power-good status output | Open-drain logic signal asserted after soft-start completion and sustained within ±4% of VID; sinks 4mA max. |
| VCC (Pin 20) | Bias supply input | 5V ±5% supply powering internal circuits; POR activates at 4.38V rising threshold and disables below 3.88V. |
Key Features
| Feature | Design Value |
|---|---|
| No programmable droop | Dedicated design for Intel Itanium™ family requiring fixed regulation without adaptive load-line compensation. |
| Lossless current sensing | Uses intrinsic rDS(ON) of synchronous rectifier MOSFETs - eliminates sense resistor cost, board space, and I²R loss. |
| Multi-phase current balancing | Compares per-phase ISEN current to average and applies correction offset to PWM comparators for <±5% inter-channel imbalance. |
| Integrated soft-start | 2048-cycle ramp (DT = 2048/FSW) prevents inrush current; PGOOD asserts only after full ramp completion. |
| Overvoltage clamping protection | Drives lower MOSFETs ON during OV event to shunt CORE voltage to ground - protects microprocessor from >115% VID stress. |
Applications
| Intel® Itanium™ Processor Power Supply | VRM for High-Performance Workstations |
|---|---|
Use Scenario: Regulating CORE voltage for dual-socket Itanium™ systems with >60A total load and strict ±1% tolerance. IC Role / Device Role / Timing Role: Primary multi-phase PWM controller coordinating up to four HIP6602A drivers and discrete MOSFETs. Use Value: Enables precise VID decoding, lossless current sharing, and fast transient response required by Itanium™ dynamic voltage scaling. |
Use Scenario: Providing stable 1.2V–1.5V CORE supply in engineering workstations running CAD/EDA software with burst-load profiles. IC Role / Device Role / Timing Role: Central voltage regulator IC managing phase interleaving, current balance, and PGOOD sequencing for system BIOS. Use Value: Delivers >1 MHz effective ripple frequency (4×250 kHz) reducing output capacitance requirements and improving load-step response. |
| Server CPU Voltage Regulator Module | High-Slew-Rate Microprocessor Supply |
Use Scenario: Implementing scalable 2–4 phase VRM on ATX-based rack servers supporting hot-pluggable CPUs. IC Role / Device Role / Timing Role: Core controller interfacing with motherboard VID bus and HIP6603A drivers to manage dynamic phase shedding. Use Value: Supports seamless transition between 2/3/4-phase operation via PWM pin strapping - optimizes efficiency across light/heavy loads. |
Use Scenario: Powering next-generation microprocessors with >2 A/ns slew rates and sub-100 ns load transients. IC Role / Device Role / Timing Role: High-bandwidth voltage regulator IC using fast error amplifier (18 MHz GBD) and low-latency current sensing. Use Value: Achieves <50 µs recovery from 50% load step due to dual-loop control and lossless current feedback path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-phase buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6553CB | Includes programmable droop feature; otherwise identical pinout, VID range, and phase support. | Suitable for Pentium 4/Core-based platforms requiring adaptive load-line compensation. | Select ISL6553CB only if droop programming is required; ISL6554CB is optimized for fixed-regulation Itanium™ designs. |
| HIP6301CB | Single-phase controller with integrated gate drivers; no VID interface or multi-phase current balancing. | Targeted at low-current embedded processors (<20A), not high-end microprocessors. | Use HIP6301CB only for cost-sensitive, single-phase applications where phase count and precision balancing are unnecessary. |
Compared with ISL6553CB, ISL6554CB removes droop programming to simplify design for Itanium™-specific regulation; compared with HIP6301CB, it adds multi-phase coordination, VID decoding, and lossless current sensing essential for >40A CORE supplies.
Availability
ISL6554CB is available at Aetrix Electronics and suitable for Intel Itanium™ processor power supplies, VRMs in enterprise workstations, and high-current server CPU regulation requiring stable component supply and long-term lifecycle support.
Supply support for ISL6554CB 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 semiconductor company specializing in power management, precision analog, and interface ICs for computing, industrial, and communications markets.
The ISL6554CB belongs to Intersil's Multi-Phase Buck Controller product line, designed specifically for high-accuracy, high-current CORE voltage regulation in Intel-compatible microprocessor platforms without programmable droop.
FAQ
What is the function of the FS/DIS pin on the ISL6554CB?
The FS/DIS pin on the ISL6554CB serves two functions: setting channel switching frequency via an external resistor to ground (224–336 kHz typical), and disabling the controller when pulled low - forcing all PWM outputs into a three-state condition. This pin is critical for configuring ripple frequency and implementing system-level shutdown sequences. The ISL6554CB datasheet specifies RT = 100kΩ for 280 kHz nominal operation.
Does the ISL6554CB support 3-phase operation, and how is it configured?
Yes, the ISL6554CB supports 3-phase operation. It is configured by connecting PWM4 to VCC (logic high) while leaving PWM1–PWM3 active; the controller automatically detects the number of active PWM outputs and sets 120° phase spacing. Unused ISEN pins (e.g., ISEN4 in 3-phase mode) must remain unconnected per the ISL6554CB datasheet. This configuration enables balanced current sharing across three synchronous-buck channels.
How does the ISL6554CB implement lossless current sensing?
The ISL6554CB implements lossless current sensing by measuring the voltage drop across the rDS(ON) of each synchronous rectifier MOSFET during conduction, converting it to a proportional current via an external RISEN resistor, and feeding that current into the ISEN1–ISEN4 pins. This eliminates external sense resistors and their associated power loss. For the ISL6554CB, nominal ISEN current is 50 µA at full load, with overcurrent trip at 82.5 µA.
What protection features does the ISL6554CB provide for microprocessor CORE voltage?
The ISL6554CB provides three core protections: (1) Overvoltage shutdown - latches and clamps CORE to ground via lower MOSFETs if VSEN exceeds 115% of VID; (2) Undervoltage detection - pulls PGOOD low if VSEN falls below 91% of VID; (3) Overcurrent hiccup mode - reduces RMS output current to 41% of trip level and restarts soft-start after delay. All operate without external components and are integral to the ISL6554CB silicon design.
Is the ISL6554CB pin-compatible with other Intersil multi-phase controllers like the ISL6555?
No, the ISL6554CB is not pin-compatible with ISL6555. While both are multi-phase controllers, ISL6555 has different pin assignments (e.g., dedicated PROCHOT input, different PWM/ISEN layout) and supports programmable droop. The ISL6554CB uses a unique 20-pin SOIC mapping defined in FN9003 Rev 3.00, and substitution requires PCB redesign. Always verify pinout against the official ISL6554CB datasheet before replacement.
ISL6554CB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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
ISL6554CB FAQ
1.How can I place an order for ISL6554CB through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6554CB 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 ISL6554CB reliable?
The price and inventory of ISL6554CB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6554CB is usually 5 days.
3.What payment methods are accepted for ISL6554CB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6554CB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6554CB?
ISL6554CB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6554CB 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 ISL6554CB?
For technical support, including ISL6554CB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6554CB requirements.
6.How does Aetrix verify that ISL6554CB is sourced from the original manufacturer or authorized distributors?
All ISL6554CB 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 ISL6554CB meets industry standards.
7.What is the process for return or replacement of ISL6554CB?
All ISL6554CB units undergo pre-shipment inspection (PSI). If there is an issue with ISL6554CB, 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 ISL6554CB part is unused and in its original packaging.
Return procedure for ISL6554CB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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