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Renesas ISL6277HRZ-T
- Part No.:
- ISL6277HRZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ISL6277HRZ-T.pdf
- Description:
- IC REG CTRLR MULTIPH 2OUT 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,999
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Product details
Overview
ISL6277HRZ-T from Renesas Electronics (formerly Intersil) 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 integrates three gate drivers, supports 3-/2-/1-phase Core VR and 2-/1-phase Northbridge VR, delivers 0.5% system voltage accuracy over temperature, operates with 4.5V–25V VIN, and uses R3™ ripple-based modulation for fast transient response in notebook power systems.
For engineers reviewing the ISL6277HRZ-T datasheet, ISL6277HRZ-T pinout, ISL6277HRZ-T application, or ISL6277HRZ-T equivalent, this page provides verified technical context, validated pin functions, confirmed dual-VR architecture details, real-world current sensing options (DCR/resistor), and precise alternative part comparisons - all grounded in the FN8270 Rev 1.00 datasheet and official ordering information.
Technical Context
The ISL6277HRZ-T implements two independent voltage regulator (VR) control loops - one for CPU core and one for Northbridge - sharing a single SVI 2.0 serial bus to reduce component count and PCB area. Its Robust Ripple Regulator (R3™) modulator dynamically adjusts switching frequency during load transients to improve settling time and light-load efficiency.
Each VR supports differential remote voltage sensing, programmable droop/offset, DCR or resistor-based current sensing, and adaptive body diode conduction time reduction. Phase configuration is set via ISENx pin states, and thermal monitoring uses dual NTC inputs (NTC/NTC_NB) feeding VR_HOT_L open-drain fault signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 25V - supports wide-input notebook battery rails including 3-cell Li-ion (10.8V nominal) and 4-cell (14.4V nominal) configurations. |
| Output Voltage Range | 0.5V to 1.55V in 6.25mV steps - digitally programmable via SVI 2.0 to match AMD processor VID tables precisely. |
| System Accuracy | ±0.5% over temperature - ensures stable core/NB voltage regulation across full industrial operating range (-10°C to +100°C). |
| Phase Support | Core VR: 1/2/3-phase; NB VR: 1/2-phase - configurable via ISEN pin logic levels without firmware changes. |
| Current Sensing | Lossless DCR or precision resistor sensing - enables accurate per-phase current monitoring and load-line implementation without added power loss. |
| Protection Features | OCP/WOC, OVP, PGOOD, thermal monitor (VR_HOT_L), and current-balancing fault detection - provides comprehensive safety for high-current CPU power stages. |
| Package | 48-pin 6×6 mm QFN (RoHS-compliant, Pb-free) - compact footprint optimized for space-constrained mobile motherboard layouts. |
Pinout & Package
ISL6277HRZ-T is housed in a 48-lead 6×6 mm QFN package with exposed thermal pad (L48.6x6B). Pin functions are fully documented in FN8270 Rev 1.00 Pages 7–9.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISEN1 / ISEN2 / ISEN3 | Core VR phase enable/disable inputs | Pull to +5V disables corresponding phase; determines 1/2/3-phase Core VR operation. |
| ISEN1_NB / ISEN2_NB | Northbridge VR phase enable/disable inputs | Pull to +5V disables Channel 1 or 2; configures 1/2-phase NB VR independently. |
| UGATE1 / LGATE1 / PHASE1 / BOOT1 | Phase 1 gate drive interface | Drives high-side/low-side MOSFETs of Core VR Phase 1; boot capacitor required between BOOT1 and PHASE1. |
| UGATE2 / LGATE2 / PHASE2 / BOOT2 | Phase 2 gate drive interface | Drives high-side/low-side MOSFETs of Core VR Phase 2; identical boot topology to Phase 1. |
| UGATEX / LGATEX / PHASEX / BOOTX | Programmable floating driver | Configurable via FCCM_NB resistor as Core VR Phase 3 or NB VR Phase 1 - enables flexible multi-phase scaling. |
| SVC / SVD / SVT / PWROK | SVI 2.0 serial interface signals | Enable bidirectional VID communication, telemetry reporting, and power-good sequencing per AMD specification. |
| IMON / IMON_NB | Analog current monitor outputs | Provide current-proportional output currents for external ADC or analog monitoring circuits. |
| NTC / NTC_NB | Thermal sensor inputs | Accept NTC thermistors to implement VR_HOT_L thermal shutdown for Core and NB VRs separately. |
Key Features
| Feature | Design Value |
|---|---|
| Dual VR with shared SVI 2.0 bus | Reduces BOM count and PCB area vs. discrete dual-controller solutions while maintaining independent loop control. |
| R3™ ripple-based modulation | Automatically adjusts switching frequency during load steps to cut transient undershoot/overshoot and boost light-load efficiency. |
| Programmable load line & droop | Enables precise IR-drop compensation across varying load currents - critical for AMD processor voltage tolerance compliance. |
| Differential remote voltage sensing | Compensates for PCB trace IR drop by measuring voltage directly at CPU die sense pins (VCORE_SENSE/VNB_SENSE). |
| Adaptive body diode conduction time reduction | Minimizes synchronous rectifier dead-time losses and improves efficiency at light-to-moderate loads. |
| Floating driver (PWM_Y + BOOTX/UGATEX/PHASEX/LGATEX) | One hardware block serves either third Core phase or first NB phase - simplifies layout and increases design reuse. |
Applications
| AMD Mobile CPU Core Power | AMD Mobile GPU/Northbridge Power |
|---|---|
|
Use Scenario: Power delivery for AMD Fusion A-series APUs in ultrathin notebooks requiring dynamic voltage scaling and thermal throttling. IC Role / Device Role / Timing Role: Dual-loop PWM controller managing both CPU core and integrated GPU voltage domains via shared SVI 2.0 interface. Use Value: Enables single-chip solution for dual-rail power with coordinated VID updates, reducing component count and improving transient coordination. |
Use Scenario: Dedicated voltage regulation for AMD chipset Northbridge logic in performance-oriented laptops. IC Role / Device Role / Timing Role: Secondary VR controller synchronized to Core VR timing via common clock and SVI bus. Use Value: Delivers independent 1-/2-phase regulation for NB rail with matched load-line behavior and shared telemetry reporting. |
| Notebook System Power Sequencing | Thermally Adaptive CPU Power Management |
|
Use Scenario: Coordinated startup/shutdown of CPU core and NB rails under AMD SVI 2.0 protocol requirements. IC Role / Device Role / Timing Role: Central sequencer using PWROK, SVC, SVD, and SVT signals to align with processor power state transitions. Use Value: Ensures compliant pre-PWROK metal VID setting and post-PWROK dynamic VID-on-the-fly updates without external logic. |
Use Scenario: Real-time thermal protection for CPU core and NB domains using on-die NTC sensors. IC Role / Device Role / Timing Role: Dual-channel thermal monitor generating VR_HOT_L fault signal when either domain exceeds threshold. Use Value: Prevents silicon damage by triggering immediate processor thermal throttling or shutdown upon localized hot-spot detection. |
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 | Direct revision upgrade with improved stability and updated SVI 2.0 timing compliance; same pinout and feature set. | Recommended for new designs per FN8270 datasheet footnote; supports identical AMD Fusion platforms. | Select ISL6277A when initiating new notebook designs or refreshing legacy ISL6277HRZ-T implementations. |
| RT8803AZSP | Single-core VR controller (no native NB VR support); requires external logic for dual-rail coordination; different SVI interface implementation. | Limited to CPU core-only applications unless augmented with secondary controller; lacks integrated Northbridge VR capability. | Consider only if Northbridge regulation is handled separately and SVI 2.0 compatibility is verified per application note AN-1234. |
Compared with ISL6277HRZ-T, ISL6277A offers enhanced reliability and full SVI 2.0 compliance for new designs, while RT8803AZSP serves as a functional alternative only when dual-VR integration is not required - making ISL6277A the preferred drop-in replacement where available.
Availability
ISL6277HRZ-T is available at Aetrix Electronics and suitable for notebook computer power systems, AMD Fusion APU reference designs, and embedded mobile computing platforms requiring stable component supply and long-term lifecycle support.
Supply support for ISL6277HRZ-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 full product support, documentation, and manufacturing continuity for the ISL6277HRZ-T.
The ISL6277HRZ-T belongs to Renesas' high-performance power management IC portfolio targeting AMD-specific mobile CPU/GPU power delivery, emphasizing SVI 2.0 compliance, multiphase flexibility, and thermal-aware regulation.
FAQ
What is the operating temperature range for the ISL6277HRZ-T?
The ISL6277HRZ-T is rated for an ambient temperature range of -10°C to +100°C, matching the HRZ grade designation in the ordering information. Its junction temperature must remain within -10°C to +125°C under normal operation, and it features thermal monitoring inputs (NTC/NTC_NB) to support active thermal management in notebook platforms using the ISL6277HRZ-T.
Does the ISL6277HRZ-T support both DCR and resistor-based current sensing?
Yes, the ISL6277HRZ-T supports both lossless inductor DCR current sensing and precision resistor current sensing on both Core and Northbridge VR outputs. The datasheet confirms configurable current-sense networks for each channel, with dedicated ISEN pins and transconductance amplifier inputs (ISUMP/ISUMN and ISUMP_NB/ISUMN_NB) enabling accurate load-line implementation and phase current balancing in the ISL6277HRZ-T.
How is phase configuration controlled on the ISL6277HRZ-T?
Phase configuration on the ISL6277HRZ-T is controlled via logic states on dedicated ISEN pins: ISEN1/ISEN2/ISEN3 for Core VR (enabling 1/2/3-phase), and ISEN1_NB/ISEN2_NB for Northbridge VR (enabling 1/2-phase). Pulling any ISEN pin to +5V disables that phase; leaving pins unconnected or grounded enables them - allowing hardware-selectable topology without firmware changes in the ISL6277HRZ-T.
What is the purpose of the FCCM_NB pin on the ISL6277HRZ-T?
The FCCM_NB pin on the ISL6277HRZ-T configures the floating internal 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 mode and also sets slew rate for both VRs. This pin enables flexible hardware reconfiguration of the ISL6277HRZ-T without redesigning gate drive circuitry.
Is the ISL6277HRZ-T pin-compatible with the ISL6277A?
Yes, the ISL6277HRZ-T is pin-compatible with the ISL6277A, as confirmed by the FN8270 datasheet which identifies ISL6277A as the "RECOMMENDED REPLACEMENT PART" with identical 48-pin QFN package and pinout. Both share the same electrical characteristics and SVI 2.0 interface behavior, making the ISL6277A a direct drop-in upgrade for the ISL6277HRZ-T in existing designs.
ISL6277HRZ-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:
- -10°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-QFN (6x6)
ISL6277HRZ-T FAQ
1.How can I place an order for ISL6277HRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6277HRZ-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 ISL6277HRZ-T reliable?
The price and inventory of ISL6277HRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6277HRZ-T is usually 5 days.
3.What payment methods are accepted for ISL6277HRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6277HRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6277HRZ-T?
ISL6277HRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6277HRZ-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 ISL6277HRZ-T?
For technical support, including ISL6277HRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6277HRZ-T requirements.
6.How does Aetrix verify that ISL6277HRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6277HRZ-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 ISL6277HRZ-T meets industry standards.
7.What is the process for return or replacement of ISL6277HRZ-T?
All ISL6277HRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6277HRZ-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 ISL6277HRZ-T part is unused and in its original packaging.
Return procedure for ISL6277HRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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