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Renesas ISL6277AHRZ
- Part No.:
- ISL6277AHRZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ISL6277AHRZ.pdf
- Description:
- IC REG CTRLR MULTIPH 2OUT 48QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ISL6277AHRZ from Renesas Electronics is a dual-output multiphase PWM controller IC designed specifically for AMD Fusion Mobile CPU/GPU core power delivery using SVI 2.0 interface. It supports 3-/2-/1-phase Core VR and 2-/1-phase Northbridge VR, integrates three gate drivers, enables DCR/resistor current sensing, and delivers 0.5% system voltage accuracy over temperature across 0.5V–1.55V output range.
For engineers reviewing the ISL6277AHRZ datasheet, ISL6277AHRZ pinout, ISL6277AHRZ application, or ISL6277AHRZ equivalent, this device is critical for notebook CPU power design requiring fast transient response, differential remote sensing, programmable slew rate, telemetry, and robust OCP/OVP/thermal protection in a compact 48-lead QFN package.
Technical Context
The ISL6277AHRZ implements Renesas' Robust Ripple Regulator R3™ technology, enabling adaptive switching frequency modulation to optimize transient settling time and light-load efficiency. Its dual VR architecture shares a single serial control bus (SVI 2.0) with 100kHz–25MHz clock support, reducing component count versus discrete dual-controller solutions.
Each VR employs differential remote voltage sensing (FB/VSEN/RTN), programmable load line droop, precision current monitoring (IMON/IMON_NB), and independent thermal monitoring via NTC inputs. Phase configuration is dynamically set through ISENx pin strapping, and driver assignment (e.g., PWM_Y, BOOTX, UGATEX) is determined by FCCM_NB resistor selection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| SVI 2.0 Interface | Fully compliant serial VID bus with 100kHz–25MHz clock; enables dynamic voltage scaling and telemetry exchange with AMD CPU. |
| Output Voltage Range | 0.5V to 1.55V in 6.25mV steps; supports precise core/Northbridge rail regulation per AMD Fusion requirements. |
| Voltage Accuracy | ±0.5% over temperature; ensures stable microprocessor operation under thermal stress and load variation. |
| Phase Configurations | Core VR: 1-, 2-, or 3-phase; Northbridge VR: 1- or 2-phase; configured via ISENx pin strapping without firmware change. |
| Current Sensing | Supports lossless DCR sensing (with NTC compensation) or precision resistor sensing on both outputs. |
| Protection Features | OCP/WOC, OVP, PGOOD, thermal monitor (NTC/NTC_NB), and fault recovery - all implemented per AMD SVI 2.0 guidelines. |
| Package | 48-lead 6×6 mm QFN (RoHS-compliant); optimized for high-density notebook motherboard layouts. |
Pinout & Package
ISL6277AHRZ is housed in a 48-lead, 6×6 mm, 0.5 mm pitch QFN package with exposed thermal pad (RoHS-compliant, Pb-free). The package supports efficient thermal dissipation in space-constrained mobile applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISEN1 / ISEN2 / ISEN3 | Core VR phase enable/disable inputs | Strapping +5V disables corresponding phase; determines 1-/2-/3-phase Core VR operation. |
| ISEN1_NB / ISEN2_NB | Northbridge VR phase enable/disable inputs | Strapping +5V disables Channel 1 or 2; configures 1-/2-phase Northbridge VR. |
| UGATE1 / LGATE1 / BOOT1 / PHASE1 | Phase 1 gate drive circuit | Drives high-side/low-side MOSFETs for Core VR Phase 1; boot capacitor required between BOOT1 and PHASE1. |
| UGATE2 / LGATE2 / BOOT2 / PHASE2 | Phase 2 gate drive circuit | Drives high-side/low-side MOSFETs for Core VR Phase 2; boot capacitor required between BOOT2 and PHASE2. |
| UGATEX / LGATEX / BOOTX / PHASEX / PWM_Y | Programmable floating driver | Configurable as Core VR Phase 3 or Northbridge VR Phase 1 via FCCM_NB resistor; enables flexible multi-phase topology. |
| SVC / SVD / SVT / PWROK | SVI 2.0 serial interface signals | Enable bidirectional communication with AMD CPU for VID updates, telemetry, and power-state coordination. |
| VSEN / FB / RTN / FB2 / COMP | Core VR feedback and compensation | Differential remote sensing (VSEN/RTN), error amplifier input (FB), output (COMP), and 1-phase compensation (FB2). |
| VSEN_NB / FB_NB / COMP_NB / PGOOD_NB | Northbridge VR feedback and status | Independent sensing, regulation, and power-good signaling for second VR output. |
| IMON / IMON_NB | Current monitor outputs | Analog current-proportional outputs for real-time core and Northbridge load monitoring. |
| NTC / NTC_NB | Thermal sensor inputs | Accepts NTC thermistors to implement VR_HOT_L thermal shutdown per AMD specification. |
Key Features
| Feature | Design Value |
|---|---|
| R3™ Modulator Technology | Adaptive switching frequency improves transient response and light-load efficiency without external compensation changes. |
| Dual VR with Shared SVI Bus | Reduces BOM count and PCB area vs. two discrete controllers while maintaining independent regulation and protection. |
| Programmable Phase Assignment | Floating driver (PWM_Y/BOOTX/UGATEX) reconfigurable as Core Phase 3 or Northbridge Phase 1 via FCCM_NB resistor. |
| Differential Remote Sensing | VSEN/RTN and VSEN_NB/RTN eliminate IR drop errors, ensuring accurate die voltage regulation at point-of-load. |
| Telemetry & VID-on-the-Fly | SVT pin provides real-time current/voltage telemetry and VID transition completion signal for coordinated CPU power state changes. |
| DCR Temperature Compensation | Single NTC input (NTC) compensates for inductor DCR drift over temperature, enabling accurate lossless current sensing. |
Applications
| AMD Notebook CPU Core Power | AMD Notebook GPU/Northbridge Power |
|---|---|
Use Scenario: High-performance ultrabook requiring dynamic voltage scaling for Intel/AMD Fusion CPUs with aggressive power states. IC Role / Device Role / Timing Role: Dual-output multiphase PWM controller managing core rail (VCORE) and Northbridge rail (VNB) simultaneously via shared SVI 2.0 bus. Use Value: Enables 3-phase core + 2-phase Northbridge operation with <0.5% voltage accuracy, fast transient response, and integrated thermal monitoring per AMD spec. | Use Scenario: Mid-range convertible laptop where Northbridge power must scale independently but share control infrastructure with CPU core. IC Role / Device Role / Timing Role: Provides dedicated 1- or 2-phase VR for graphics/Northbridge domain while leveraging same SVI interface and telemetry path as core VR. Use Value: Reduces total solution size and cost by eliminating second SVI controller; supports independent load-line tuning and OCP thresholds per rail. |
| High-Efficiency Mobile VR Design | Thermally Constrained Thin-and-Light Platform |
Use Scenario: Fanless tablet-class design requiring >90% efficiency at 10A load and ultra-low quiescent current during C6/C7 sleep states. IC Role / Device Role / Timing Role: Implements R3™ modulator with diode emulation and period stretching to minimize conduction losses and maintain regulation during light loads. Use Value: Achieves high efficiency across full load range without sacrificing transient performance; supports discontinuous conduction mode (DCM) automatically. | Use Scenario: 13mm-thick clamshell notebook with limited airflow, requiring localized thermal shutdown before CPU throttling occurs. IC Role / Device Role / Timing Role: Monitors core and Northbridge temperatures via dual NTC inputs (NTC/NTC_NB) and asserts open-drain VR_HOT_L signal. Use Value: Prevents silicon damage by triggering immediate CPU thermal throttle when either VR exceeds safe junction temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiphase VR controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6277HIRZ | Extended temperature range (–40°C to +100°C) vs. ISL6277AHRZ (–10°C to +100°C); identical electrical specs and pinout. | Required for industrial or extended-ambient notebook designs operating below 0°C ambient. | Select ISL6277HIRZ when cold-start reliability below –10°C is mandatory; otherwise ISL6277AHRZ suffices for commercial notebooks. |
| RTQ2136B-QA | Single-output 6-phase controller with I²C interface (not SVI 2.0); no native Northbridge VR support or AMD-specific telemetry. | Applicable only for custom CPU power designs without AMD SVI dependency; requires external logic for dual-rail coordination. | Choose RTQ2136B-QA only if AMD compatibility is not required and higher phase count (6-phase core) is needed; not a drop-in replacement. |
Compared with ISL6277AHRZ, ISL6277HIRZ offers broader thermal qualification for harsh environments but no functional upgrade, while RTQ2136B-QA provides higher phase count and I²C flexibility at the cost of AMD SVI 2.0 compliance and dual-VR integration.
Availability
ISL6277AHRZ is available at Aetrix Electronics and suitable for notebook computer power delivery, AMD Fusion CPU/GPU core regulation, and mobile platform VR design requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL6277AHRZ 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
Renesas Electronics is a global semiconductor leader delivering high-performance analog, power, and embedded processing solutions for automotive, industrial, and computing markets.
The ISL6277AHRZ belongs to Renesas' Power Management IC product line, engineered specifically for AMD-compatible mobile CPU/GPU voltage regulation with emphasis on SVI 2.0 interoperability, multiphase flexibility, and thermal-aware power delivery.
FAQ
What is the primary function of the ISL6277AHRZ in a notebook power system?
The ISL6277AHRZ serves as a dual-output multiphase PWM controller IC that regulates both the CPU core (VCORE) and Northbridge/GPU (VNB) rails in AMD Fusion-based notebooks. It implements SVI 2.0 communication, supports up to 3-phase core and 2-phase Northbridge operation, and integrates gate drivers, current sensing, telemetry, and comprehensive protection - all within a single 48-pin QFN package. This eliminates the need for separate controllers and reduces board space.
Does the ISL6277AHRZ support both DCR and resistor-based current sensing?
Yes, the ISL6277AHRZ supports both lossless inductor DCR current sensing - with single NTC thermistor compensation for temperature drift - and precision resistor current sensing on both the Core and Northbridge VR outputs. The ISUMP/ISUMN pins provide transconductance amplifier inputs for DCR networks, while ISENx pins accept resistor-based sense signals. Selection is made at layout; no configuration register change is required.
How does the ISL6277AHRZ achieve fast transient response during CPU load steps?
The ISL6277AHRZ achieves fast transient response using Renesas' Robust Ripple Regulator R3™ technology, which dynamically adjusts switching frequency based on load transients. Unlike fixed-frequency modulators, R3™ increases frequency during rapid load steps to reduce output voltage deviation and accelerates recovery time. Combined with differential remote sensing (VSEN/RTN) and adaptive body diode conduction time reduction, it maintains tight regulation even under 10A/µs load steps.
Can the ISL6277AHRZ be used in a single-phase Core VR configuration?
Yes, the ISL6277AHRZ supports 1-phase Core VR operation. This is enabled by pulling ISEN2 and ISEN3 to +5V, which disables Phases 2 and 3. In this mode, only UGATE1/LGATE1/PHASE1/BOOT1 are active for Core VR control, while FB2 is disconnected from FB to allow optimized 1-phase compensation network design. The Northbridge VR remains independently configurable as 1- or 2-phase.
What is the role of the FCCM_NB pin on the ISL6277AHRZ?
The FCCM_NB pin configures the functional assignment of the floating driver (PWM_Y/BOOTX/UGATEX/PHASEX/LGATEX) and sets slew rate for both VR outputs. A resistor from FCCM_NB to GND selects whether the floating driver operates as Core VR Phase 3 or Northbridge VR Phase 1. The same resistor value also programs the VID-on-the-fly slew rate for smooth voltage transitions during CPU P-state changes.
ISL6277AHRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- Robust Ripple Regulator™ (R3)
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Controller, AMD Fusion™ SVI 2.0 CPU GPU
- Voltage - Input:
- 4.5V ~ 25V
- Number of Outputs:
- 2
- Voltage - Output:
- 0.006V ~ 1.55V
- Operating Temperature:
- -10°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-QFN (6x6)
ISL6277AHRZ FAQ
1.How can I place an order for ISL6277AHRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6277AHRZ 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 ISL6277AHRZ reliable?
The price and inventory of ISL6277AHRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6277AHRZ is usually 5 days.
3.What payment methods are accepted for ISL6277AHRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6277AHRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6277AHRZ?
ISL6277AHRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6277AHRZ 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 ISL6277AHRZ?
For technical support, including ISL6277AHRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6277AHRZ requirements.
6.How does Aetrix verify that ISL6277AHRZ is sourced from the original manufacturer or authorized distributors?
All ISL6277AHRZ 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 ISL6277AHRZ meets industry standards.
7.What is the process for return or replacement of ISL6277AHRZ?
All ISL6277AHRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6277AHRZ, 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 ISL6277AHRZ part is unused and in its original packaging.
Return procedure for ISL6277AHRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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