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Renesas ISL6277IRZ-T
- Part No.:
- ISL6277IRZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ISL6277IRZ-T.pdf
- Description:
- IC REG CTRLR MULTIPH 2OUT 48QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ISL6277IRZ-T from Renesas (formerly Intersil) is a dual-output multiphase PWM controller compliant with AMD Fusion™ SVI 2.0, designed for core and Northbridge power delivery in mobile CPUs. 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 ISL6277IRZ-T datasheet, ISL6277IRZ-T pinout, ISL6277IRZ-T application, or ISL6277IRZ-T equivalent, this page provides verified technical context, validated pin functions, confirmed SVI 2.0 interface behavior, real-world phase configuration options, and documented thermal monitoring implementation using NTC inputs.
Technical Context
The ISL6277IRZ-T implements Intersil's Robust Ripple Regulator (R3™) modulator architecture, enabling automatic switching frequency adjustment during load transients to improve settling time and light-load efficiency. Its dual-VR architecture shares a single serial control bus (SVI 2.0) for coordinated VID-on-the-fly updates and telemetry reporting.
It supports differential remote voltage sensing on both outputs, programmable slew rate and droop, adaptive body diode conduction time reduction, and independent OCP/WOC, OVP, PGOOD, and thermal monitor circuits per VR. Phase balancing is achieved via transconductance amplifier-based current summing at ISUMP/ISUMN pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| SVI Interface | Fully compliant AMD Serial VID 2.0 interface for dynamic voltage/frequency scaling and telemetry reporting. |
| Core VR Phases | Programmable 1-, 2-, or 3-phase operation via ISEN1/ISEN2/ISEN3 pin states. |
| Northbridge VR Phases | Programmable 1- or 2-phase operation via ISEN1_NB/ISEN2_NB pin states. |
| Output Voltage Range | 0.5V to 1.55V in 6.25mV steps; 0.5% system accuracy over -40°C to +85°C ambient. |
| Current Sensing | Supports lossless DCR sensing (with NTC compensation) or precision resistor sensing on both VRs. |
| Package | 48-pin 6×6 mm QFN with exposed thermal pad; RoHS-compliant, Pb-free. |
| Protection Features | OCP/WOC, OVP, UVP, thermal monitor (NTC/NTC_NB), PGOOD/PGOOD_NB, fault recovery with auto-restart. |
Pinout & Package
ISL6277IRZ-T uses a 48-lead 6×6 mm QFN package with exposed GND pad (bottom). Thermal resistance θJA = 29°C/W, θJC = 3.5°C/W. Pin functions are validated per FN8270 Rev 1.00 datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISEN1, ISEN2, ISEN3 | Core VR channel enable/disable inputs | Pulling to +5V disables corresponding phase; ISEN1 high shuts down entire Core VR. |
| ISEN1_NB, ISEN2_NB | Northbridge VR channel enable/disable inputs | Pulling ISEN2_NB high forces single-phase NB VR; ISEN1_NB high disables NB VR. |
| UGATE1/PHASE1/LGATE1 | Phase 1 gate driver outputs | Drive high-side and low-side MOSFETs of Core VR Phase 1; PHASE1 connects to HS source/LS drain node. |
| BOOT1, BOOT2, BOOTX | Bootstrap capacitor connections | Each powers respective high-side driver; charged via internal boot diode from VDDP. |
| VSEN, VSEN_NB | Differential voltage sense inputs | Connect to +sense pins of CPU die; used with RTN for precise remote regulation. |
| SVC, SVD, SVT | SVI 2.0 serial interface signals | SVC = clock, SVD = bidirectional data, SVT = telemetry output to CPU. |
| VR_HOT_L | Thermal overload indicator | Open-drain active-low signal indicating thermal shutdown of either VR section. |
| PGOOD, PGOOD_NB | Power-good status outputs | Open-drain indicators per VR; require external pull-up to VDD or 3.3V. |
Key Features
| Feature | Design Value |
|---|---|
| R3™ Modulator Architecture | Enables variable-frequency PWM for faster transient response and improved light-load efficiency without external compensation changes. |
| Dual Independent VR Control | Core and Northbridge outputs operate with separate feedback loops, current sensing, and protection-enabling asymmetric phase configurations (e.g., 3+1). |
| Programmable Load Line & Droop | Adjustable offset and droop on both outputs via COMP/COMP_NB resistors, supporting precise load-line compliance for AMD processors. |
| Floating Driver & PWM_Y Configuration | FCCM_NB resistor selects whether PWM_Y/BOOTX/UGATEX/PHASEX/LGATEX serve Core Phase 3 or NB Phase 1-maximizing layout flexibility. |
| Thermal Monitoring with NTC Inputs | Dedicated NTC and NTC_NB pins feed VR_HOT_L circuitry, enabling independent thermal shutdown of Core or Northbridge VR sections. |
Applications
| AMD Mobile CPU Core Power | Notebook System Power Delivery |
|---|---|
Use Scenario: High-efficiency, dynamically scaled core voltage supply for AMD Fusion™ mobile APUs in ultrabooks and thin-and-light notebooks. IC Role / Device Role / Timing Role: Dual-VR PWM controller managing up to 3-phase Core and 2-phase Northbridge power with SVI 2.0 coordination. Use Value: Enables precise 6.25mV VID steps, 0.5% voltage accuracy, and fast transient response required for CPU DVFS and Turbo modes. | Use Scenario: Compact, integrated power solution for space-constrained notebook motherboards requiring dual-rail processor regulation. IC Role / Device Role / Timing Role: Single-package replacement for discrete dual-controller designs, reducing BOM count and PCB area. Use Value: Shared SVI 2.0 bus lowers interconnect complexity and eliminates timing skew between Core/NB rails. |
| Mobile Graphics Processor Power | Thermally Constrained Embedded Systems |
Use Scenario: Dedicated Northbridge VR powering integrated GPU cores in AMD A-series APUs under dynamic graphics workloads. IC Role / Device Role / Timing Role: Configurable 1- or 2-phase Northbridge regulator with independent current sensing and thermal monitoring. Use Value: Maintains stable GPU voltage during burst rendering while preventing thermal runaway via NTC_NB input. | Use Scenario: Industrial or embedded systems using AMD mobile CPUs where extended temperature operation (-40°C to +85°C) is required. IC Role / Device Role / Timing Role: Temperature-rated controller (IRZ grade) with robust noise immunity and differential sensing for noisy environments. Use Value: Ensures reliable power delivery across full industrial temp range without derating, supported by validated thermal shutdown logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output multiphase controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6277A | Recommended replacement per FN8270 datasheet; includes enhanced R3™ stability and updated SVI 2.0 timing margins. | Same pinout and SVI 2.0 functionality; supports identical Core/NB phase configurations and sensing methods. | Select ISL6277A for new designs requiring long-term availability and improved transient performance. |
| RTQ2136B-QA | Automotive-grade dual-output controller with AEC-Q100 qualification; supports 4-phase Core + 2-phase NB but lacks SVI 2.0 interface. | Requires custom I²C or PMBus host interface instead of AMD-native SVI 2.0; no VID-on-the-fly or SVT telemetry. | Choose RTQ2136B-QA only when automotive qualification or higher phase count is mandatory and SVI 2.0 compatibility is not required. |
Compared with ISL6277IRZ-T, ISL6277A offers improved stability and lifecycle support while maintaining full functional and pin compatibility; RTQ2136B-QA provides higher phase capability and AEC-Q100 rating but requires complete firmware and interface redesign due to absence of SVI 2.0.
Availability
ISL6277IRZ-T is available at Aetrix Electronics and suitable for AMD mobile CPU core power, notebook system power delivery, mobile GPU power, and thermally constrained embedded systems requiring stable component supply and long-term industrial temperature support.
Supply support for ISL6277IRZ-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
Renesas Electronics acquired Intersil in 2017 and maintains its high-performance analog and power management portfolio. The company specializes in power delivery ICs for computing, industrial, and automotive markets.
The ISL6277IRZ-T belongs to Renesas' legacy Intersil multiphase controller product line, engineered specifically for AMD Fusion™ mobile platforms requiring SVI 2.0 compliance, dual-rail coordination, and compact 48-pin QFN integration.
FAQ
What is the operating temperature range for the ISL6277IRZ-T?
The ISL6277IRZ-T is rated for an ambient operating temperature range of -40°C to +85°C, making it suitable for industrial and extended-temperature notebook applications. Its junction temperature limit is +125°C, and thermal protection is implemented via dedicated NTC and NTC_NB inputs feeding the VR_HOT_L circuit. This specification is confirmed in the "Recommended Operating Conditions" section of FN8270 Rev 1.00.
Does the ISL6277IRZ-T support both DCR and resistor current sensing?
Yes, the ISL6277IRZ-T supports both lossless inductor DCR current sensing-with optional NTC-based temperature compensation-and precision resistor current sensing on both Core and Northbridge VR outputs. The datasheet confirms this in the "Features" and "Key Component Selection" sections, including design guidance for DCR network component values and resistor sensing layout.
How does the ISL6277IRZ-T implement SVI 2.0 communication?
The ISL6277IRZ-T implements SVI 2.0 using three dedicated pins: SVC (clock), SVD (bidirectional data), and SVT (telemetry output). It supports pre-PWROK metal VID, VID-on-the-fly transitions, and full telemetry reporting including current, voltage, and thermal data. This interface is fully documented in the "AMD Serial VID Interface 2.0" section of FN8270 Rev 1.00.
Can the ISL6277IRZ-T be configured for a 3+1 phase setup?
Yes, the ISL6277IRZ-T supports a 3+1 phase configuration: Core VR operates in 3-phase mode (using ISEN1/ISEN2/ISEN3), while Northbridge VR runs in 1-phase mode (by pulling ISEN2_NB high). Figure 5 in FN8270 Rev 1.00 shows this exact mid-power CPU configuration using resistor sensing, and the "Channel Configuration" section confirms independent phase selection per VR.
What is the purpose of the FCCM_NB pin on the ISL6277IRZ-T?
The FCCM_NB pin configures the floating driver (BOOTX/UGATEX/PHASEX/LGATEX) and PWM_Y output to serve either Core VR Phase 3 or Northbridge VR Phase 1. A resistor from FCCM_NB to GND selects the function and also sets the slew rate for both VRs. This dual-purpose configuration is explicitly defined in the "Floating DriverX & PWM_Y Configuration" section of FN8270 Rev 1.00.
ISL6277IRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- Robust Ripple Regulator™ (R3)
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-QFN (6x6)
ISL6277IRZ-T FAQ
1.How can I place an order for ISL6277IRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6277IRZ-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 ISL6277IRZ-T reliable?
The price and inventory of ISL6277IRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6277IRZ-T is usually 5 days.
3.What payment methods are accepted for ISL6277IRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6277IRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6277IRZ-T?
ISL6277IRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6277IRZ-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 ISL6277IRZ-T?
For technical support, including ISL6277IRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6277IRZ-T requirements.
6.How does Aetrix verify that ISL6277IRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6277IRZ-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 ISL6277IRZ-T meets industry standards.
7.What is the process for return or replacement of ISL6277IRZ-T?
All ISL6277IRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6277IRZ-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 ISL6277IRZ-T part is unused and in its original packaging.
Return procedure for ISL6277IRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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