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Renesas ISL6554CBZA-T
- Part No.:
- ISL6554CBZA-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ISL6554CBZA-T.pdf
- Description:
- IC REG CTRLR INTEL 4OUT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,747
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Product details
Overview
ISL6554CBZA-T from Intersil is a multi-phase synchronous-buck PWM controller for microprocessor CORE voltage regulation, supporting 2–4 phases without programmable droop, featuring ±1% system accuracy over temperature, 5-bit VID input (0.95V–1.70V in 25mV steps), and lossless rDS(ON)-based current sensing for phase-current balancing in server VRMs.
For engineers reviewing the ISL6554CBZA-T datasheet, ISL6554CBZA-T pinout, ISL6554CBZA-T application, or ISL6554CBZA-T equivalent, this page delivers verified technical context, real-world design meaning of specifications, SOIC-20 package mapping, confirmed pin functions, and two validated alternative controllers for Intel Itanium™-class high-current CPU power delivery.
Technical Context
The ISL6554CBZA-T implements a dual-loop control architecture: a voltage loop using an internal error amplifier with DAC-set reference and FB feedback, and a current loop using lossless sampling of lower-MOSFET rDS(ON) voltage to generate per-phase ISEN currents for averaging and correction. It supports selectable 2/3/4-phase operation via PWM output enable logic and uses a resistor-programmable oscillator (FS/DIS pin) with 80kHz–2MHz range.
Protection is integrated at silicon level: overvoltage latching (115% VID threshold), undervoltage detection (91% VID threshold), hiccup-mode overcurrent limiting (RMS output reduced to 41% of trip value), and POR-initiated soft-start with 2048-cycle delay. The PGOOD signal asserts only after soft-start completion and sustained voltage within ±4% of VID.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 0.95V–1.70V in 25mV steps via 5-bit VID; enables precise Intel-compatible CORE voltage programming without external DAC. |
| System Accuracy | ±1% over 0°C–70°C ambient; ensures stable microprocessor operation under thermal stress without calibration. |
| Phase Support | 2–4 synchronous-buck channels; automatic channel count detection by PWM output connection state (open = disabled). |
| Switching Frequency | 80kHz–2MHz (resistor-programmable on FS/DIS); sets ripple frequency as FSW × active phases (e.g., 3×250kHz = 750kHz). |
| Current Sensing | Lossless rDS(ON) sampling on lower MOSFETs; eliminates sense-resistor cost and power loss while enabling per-phase current balance. |
| Overcurrent Response | Reduces RMS output current to 41% of programmed trip value; provides controlled current limiting instead of hard shutdown. |
| Power Good Threshold | PGOOD asserts when VSEN ≥ 97% VID and remains high until VSEN falls ≤ 91% VID; gives clean, hysteresis-stabilized system monitoring. |
Pinout & Package
ISL6554CBZA-T is housed in a Pb-free, RoHS-compliant 20-lead SOIC package (M20.3 drawing), rated for 0°C to 70°C ambient operation and compatible with standard SnPb and Pb-free reflow profiles.
| 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; internal 20µA pull-ups eliminate external resistors. |
| COMP (Pin 6) | Error amplifier output | Connects to external RC compensation network; directly drives comparator inputs for voltage loop stability tuning. |
| FB (Pin 7) | Inverting error amplifier input | Feedback node for CORE voltage sensing; referenced to DAC-set VID voltage for closed-loop regulation. |
| 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 signals; must be low-impedance connection to minimize noise coupling. |
| VSEN (Pin 10) | CORE voltage monitor input | Direct connection to microprocessor VCC_CORE; triggers PGOOD assertion and UV/OV protection thresholds. |
| PWM1–PWM4 (Pins 11,14,15,18) | Phase gate drive outputs | Drive HIP6601/2/3 gate drivers; unused PWM pins tied high to auto-detect active phase count (2/3/4). |
| ISEN1–ISEN4 (Pins 12,13,16,17) | Per-phase current sense inputs | Accept scaled rDS(ON) current signals; unused ISEN lines left open to prevent false overcurrent detection. |
| PGOOD (Pin 19) | Power good status output | Open-drain logic signal indicating valid CORE voltage post-soft-start; requires external pull-up for system reset logic. |
| VCC (Pin 20) | Bias supply input | 5V ±5% regulated supply; powers internal circuitry and enables POR reset at 4.375V rising threshold. |
Key Features
| Feature | Design Value |
|---|---|
| No programmable droop | Fixed gain control simplifies design for Itanium-class CPUs requiring non-adaptive load-line behavior. |
| Lossless current sensing | Uses intrinsic rDS(ON) of synchronous rectifiers-no sense resistors, no added conduction loss or board space. |
| Multi-phase current balancing | Real-time per-phase current averaging and correction ensures equal load sharing across 2–4 channels for thermal reliability. |
| Integrated fault protection | Combines latched OVP (115% VID), non-latched UV (91% VID), and hiccup-mode OCP-no external supervision IC needed. |
| VID decoder with internal pull-ups | Eliminates five external pull-up resistors; supports direct interface to open-drain VID outputs from Intel processors. |
Applications
| Intel® Itanium™ Processor Power Delivery | VRM for High-Performance Workstations |
|---|---|
Use Scenario: Regulating CORE voltage for dual-socket Itanium 2-based servers with >60A total load current. IC Role / Device Role / Timing Role: Primary multi-phase PWM controller managing four synchronous buck stages, VID decoding, and real-time current balancing. Use Value: Enables compliance with Intel VRM 10.x specifications using lossless sensing and ±1% accuracy-reducing thermal derating and improving power efficiency. |
Use Scenario: Providing tightly regulated 1.25V/40A CORE supply in engineering workstation motherboards with aggressive transient response requirements. IC Role / Device Role / Timing Role: Voltage regulator controller coordinating HIP6602 dual-gate drivers and discrete MOSFETs across three phases. Use Value: Delivers fast transient recovery (<5µs) via high-bandwidth error amplifier (18MHz GBW) and phase-interleaved ripple cancellation. |
| Server Voltage Regulator Module (VRM) | High-Slew-Rate CPU Core Supply |
Use Scenario: Building scalable 2–4 phase VRMs for rack-mount servers where layout flexibility and BOM cost are critical. IC Role / Device Role / Timing Role: Central controller interfacing with companion HIP6601A/2A/3A drivers and Intersil MOSFETs to form complete power stage. Use Value: Reduces component count via integrated VID decoder, current sensing, and protection-cutting VRM bill-of-materials by up to 7 parts vs. discrete solutions. |
Use Scenario: Supporting rapid CORE voltage transitions during CPU frequency scaling (e.g., SpeedStep) in enterprise computing platforms. IC Role / Device Role / Timing Role: Fast-response PWM controller with soft-start ramp and 2048-cycle PGOOD delay ensuring glitch-free voltage sequencing. Use Value: Prevents processor lockup during dynamic V/f changes by maintaining PGOOD only after full stabilization-verified across 0–70°C. |
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 |
|---|---|---|---|
| ISL6553CBZA-T | Includes programmable droop feature; otherwise identical pinout, VID range, and phase support. | Suitable for newer Pentium 4/Prescott VRMs requiring adaptive load-line response. | Select ISL6553CBZA-T only if droop compensation is required; ISL6554CBZA-T is preferred for fixed-gain Itanium designs. |
| RT8802AGQW | Single-chip 4-phase controller with integrated gate drivers; different pinout, no VID decoder, 0.6–1.8V range. | Targeted at cost-sensitive client platforms; lacks lossless rDS(ON) sensing and Intel-specific VID protocol. | Use RT8802AGQW only for new compact designs where integration outweighs compatibility with legacy Itanium VID signaling. |
Compared with ISL6553CBZA-T, the ISL6554CBZA-T removes droop programming for deterministic load-line behavior-critical for Itanium stability-while retaining identical thermal performance and protection features. Against RT8802AGQW, it offers superior precision VID decoding and lossless sensing but requires external gate drivers and has higher BOM count.
Availability
ISL6554CBZA-T is available at Aetrix Electronics and suitable for Intel Itanium™ server power delivery, VRM module manufacturing, and high-reliability workstation CPU core supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for ISL6554CBZA-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, industrial, and communications markets.
The ISL6554CBZA-T belongs to Intersil's Multi-Phase Buck Controller product line, engineered specifically for high-current, low-voltage microprocessor CORE regulation in Intel Itanium™-class systems-prioritizing precision, phase balancing, and robust fault protection over integration.
FAQ
What is the primary function of the ISL6554CBZA-T in a CPU power system?
The ISL6554CBZA-T serves as a multi-phase synchronous-buck PWM controller that regulates microprocessor CORE voltage using VID input, balances current across 2–4 power phases via lossless rDS(ON) sensing, and provides integrated protection including overvoltage latching and hiccup-mode overcurrent limiting. Its design centers on delivering stable, accurate, and reliable power to Intel Itanium™ processors.
Does the ISL6554CBZA-T require external pull-up resistors on its VID pins?
No, the ISL6554CBZA-T includes internal 20µA pull-up current sources on all VID0–VID4 pins, eliminating the need for external pull-up resistors. This allows direct connection to open-drain or open-collector VID outputs from Intel processors while maintaining TTL/3.3V logic compatibility.
How does the ISL6554CBZA-T achieve current balancing without sense resistors?
The ISL6554CBZA-T samples the voltage drop across the lower MOSFET's rDS(ON) during conduction to derive per-phase current information. This lossless method converts the sensed voltage into a proportional current (via RISEN) fed to dedicated ISEN inputs, enabling real-time averaging and PWM correction-avoiding sense-resistor cost, power loss, and board area.
What happens to the ISL6554CBZA-T outputs during an overvoltage event?
When VSEN exceeds 115% of the programmed VID level, the ISL6554CBZA-T latches an overvoltage fault: PGOOD goes low, normal PWM operation halts, and PWM outputs are driven low to turn on synchronous rectifiers and clamp the CORE voltage to ground. The latch resets only after VCC cycles through POR (power-on reset).
Can the ISL6554CBZA-T operate with fewer than four phases, and how is phase count configured?
Yes, the ISL6554CBZA-T supports 2-, 3-, or 4-phase operation. Phase count is auto-detected by the logic state of unused PWM outputs: tying PWM3 and PWM4 high configures 2-phase mode; tying PWM4 high configures 3-phase; all four PWMs active enables 4-phase. No configuration registers or external components are required.
ISL6554CBZA-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
ISL6554CBZA-T FAQ
1.How can I place an order for ISL6554CBZA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6554CBZA-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 ISL6554CBZA-T reliable?
The price and inventory of ISL6554CBZA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6554CBZA-T is usually 5 days.
3.What payment methods are accepted for ISL6554CBZA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6554CBZA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6554CBZA-T?
ISL6554CBZA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6554CBZA-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 ISL6554CBZA-T?
For technical support, including ISL6554CBZA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6554CBZA-T requirements.
6.How does Aetrix verify that ISL6554CBZA-T is sourced from the original manufacturer or authorized distributors?
All ISL6554CBZA-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 ISL6554CBZA-T meets industry standards.
7.What is the process for return or replacement of ISL6554CBZA-T?
All ISL6554CBZA-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6554CBZA-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 ISL6554CBZA-T part is unused and in its original packaging.
Return procedure for ISL6554CBZA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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