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Renesas ISL6377IRZ
- Part No.:
- ISL6377IRZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ISL6377IRZ.pdf
- Description:
- IC REG CTRLR MULTIPH 2OUT 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,626
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Product details
Overview
ISL6377IRZ from Renesas (formerly Intersil) is a dual-output, multiphase PWM controller IC designed specifically for AMD Fusion™ desktop CPU/GPU core power delivery using SVI 2.0 serial interface. It integrates three gate drivers and supports up to 4-phase Core VR and 2-phase Northbridge VR, with R3™ modulator architecture, DCR/resistor current sensing, and ±0.8% system voltage accuracy over temperature. It targets high-efficiency, tightly regulated core power in AMD-based desktop motherboards.
For engineers reviewing the ISL6377IRZ datasheet, ISL6377IRZ pinout, ISL6377IRZ application, or ISL6377IRZ equivalent, key selection criteria include SVI 2.0 compliance, dual-VR phase configurability (1–4 / 1–2), R3™ transient response, differential remote sensing, and thermal monitoring via dual NTC inputs - all in a RoHS-compliant 48-pin 6×6 QFN package.
Technical Context
The ISL6377IRZ implements two independent voltage regulators - Core VR and Northbridge VR - sharing a single AMD SVI 2.0 serial bus (SVC/SVD/SVT) for VID programming and telemetry. Its Robust Ripple Regulator (R3™) modulator dynamically adjusts switching frequency during load transients to improve settling time and light-load efficiency.
Each VR supports programmable phase count (Core: 1–4; NB: 1–2), adaptive body diode conduction reduction, differential remote voltage sensing (VSEN/RTN), and dual-current-sensing methods (DCR or precision resistor). Protection includes OCP/WOC, OVP/UVP, PGOOD, and thermal monitoring via dedicated NTC inputs for both VRs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| SVI 2.0 Interface | Fully compliant serial bus (100kHz–25MHz clock); enables dynamic VID-on-the-fly updates and telemetry reporting to AMD CPU. |
| Output Voltage Range | 0.5V–1.55V in 6.25mV steps; supports precise core/NB rail regulation per AMD specification. |
| System Accuracy | ±0.8% over –40°C to +85°C ambient; ensures stable voltage under thermal stress without recalibration. |
| Switching Frequency | Programmable 280–450kHz per VR; balances efficiency, component size, and EMI in high-power CPU applications. |
| Current Sensing | Supports lossless DCR sensing (with single NTC for temperature compensation) or precision resistor sensing on both outputs. |
| Thermal Monitoring | Dual independent NTC inputs (NTC, NTC_NB) feed VR_HOT_L open-drain thermal warning signal per VR domain. |
| Package | 48-pin 6×6 mm QFN (RoHS-compliant); exposes thermal pad for efficient PCB heat dissipation in dense VRM layouts. |
Pinout & Package
ISL6377IRZ uses a 48-lead 6×6 mm QFN package with exposed thermal pad (GND). Pin functions are validated per FN8336 Rev 1.00 datasheet, including dual VR control, integrated gate drivers, SVI 2.0 interface, and thermal/current sensing I/O.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISEN1–ISEN4, ISEN1_NB–ISEN2_NB | Individual channel current sense inputs | Enable per-phase enable/disable (e.g., tie ISEN3 to +5V to force Core VR into 2-phase mode). |
| UGATE1–UGATE2, UGATEX, LGATE1–LGATE2, LGATEX | High-side/low-side MOSFET gate drive outputs | Three integrated drivers (two fixed Core, one configurable Core/NB) support flexible multi-phase topologies. |
| VSEN / VSEN_NB / RTN | Differential remote voltage sense inputs | Compensate for IR drop across PCB traces; connect directly to CPU die sense points for accurate regulation. |
| SVC / SVD / SVT | SVI 2.0 serial interface signals | SVC = clock, SVD = bidirectional data, SVT = telemetry output; enable closed-loop communication with AMD CPU. |
| NTC / NTC_NB | Thermistor bias inputs | Provide temperature-dependent current for VR_HOT_L thermal warning generation per VR domain. |
| PGOOD / PGOOD_NB | Open-drain power-good indicators | Signal stable regulation readiness for Core and Northbridge rails; require external pull-up to VDDP or 3.3V. |
Key Features
| Feature | Design Value |
|---|---|
| R3™ Multiphase Modulator | Auto-adjusts switching frequency during load transients for faster settling (<10µs) and improved light-load efficiency vs fixed-frequency PWM. |
| Dual-VR Architecture | Single-chip integration of Core and Northbridge VR controllers reduces BOM cost and board area vs dual-controller solutions. |
| Configurable Phase Count | Core VR supports 1–4 phases; Northbridge VR supports 1–2 phases - selectable via ISEN pin strapping or SVI 2.0 commands. |
| Adaptive Body Diode Reduction | Minimizes synchronous rectifier dead-time conduction losses, improving efficiency at medium-to-heavy loads. |
| VID-on-the-Fly Slew Rate Control | Programmable 8–24 mV/µs slew rate prevents overshoot/undershoot during dynamic voltage transitions (e.g., P-state changes). |
| Dual Thermal Monitoring | Independent NTC inputs and VR_HOT_L output allow per-rail thermal throttling coordination with AMD CPU firmware. |
Applications
| AMD Desktop CPU Core Power | AMD Desktop GPU/Northbridge Power |
|---|---|
|
Use Scenario: Primary voltage regulation for AMD Fusion A-series or FX-series CPU cores on ATX/mATX motherboards. IC Role / Device Role / Timing Role: Dual-output multiphase PWM controller managing up to 4-phase Core VR and 2-phase NB VR via shared SVI 2.0 bus. Use Value: Enables tight ±0.8% voltage accuracy across –40°C to +85°C, critical for CPU stability during turbo boost and thermal cycling. |
Use Scenario: Dedicated power delivery for AMD chipset Northbridge or integrated GPU logic on high-performance desktop platforms. IC Role / Device Role / Timing Role: Secondary VR channel with independent current sensing, remote sensing, and thermal monitoring via NTC_NB. Use Value: Eliminates need for separate NB VR controller, reducing solution footprint by >30% and simplifying layout in constrained VRM zones. |
| Multi-Phase VRM Reference Design | SVI 2.0 Compliant Motherboard Platform |
|
Use Scenario: Base controller in reference designs for 4+1 or 3+1 phase VRMs targeting AMD AM3+/FM2+ socket platforms. IC Role / Device Role / Timing Role: Configurable gate driver outputs (UGATEX/LGATEX) and PWM_Y/FCCM_NB pins enable flexible phase assignment and diode emulation. Use Value: Supports rapid prototyping of scalable VRMs - e.g., 4-phase Core + 1-phase NB - without redesigning controller layout. |
Use Scenario: Enabling full SVI 2.0 compliance in OEM motherboard BIOS/firmware stacks requiring VID-on-the-fly, telemetry, and thermal coordination. IC Role / Device Role / Timing Role: SVI 2.0 interface (SVC/SVD/SVT) provides real-time voltage telemetry and dynamic offset/droop programming to CPU. Use Value: Meets AMD's mandatory SVI 2.0 timing and protocol requirements for certified platform validation and power-state transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output multiphase VR controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6376IRZ | Single-output (Core-only) version; lacks Northbridge VR channel, NTC_NB, PGOOD_NB, and SVI 2.0 NB-specific registers. | Only suitable for platforms where Northbridge power is handled externally or integrated into CPU package. | Select ISL6376IRZ only when Northbridge VR functionality is unnecessary and board space must be minimized. |
| RT8803AZSP | Single-core VR controller with 3-phase max; no SVI 2.0 interface - uses SMBus/PMBus instead; no integrated NB VR or dual NTC monitoring. | Targets Intel or generic x86 platforms; incompatible with AMD SVI 2.0 protocol and VID encoding scheme. | Choose RT8803AZSP only for non-AMD designs requiring PMBus telemetry and simpler 3-phase core regulation. |
Compared with ISL6377IRZ, ISL6376IRZ removes Northbridge VR capability but retains identical Core VR specs and package, while RT8803AZSP replaces SVI 2.0 with PMBus and omits dual-VR architecture - making ISL6377IRZ uniquely suited for AMD Fusion desktop VRM integration.
Availability
ISL6377IRZ is available at Aetrix Electronics and suitable for AMD desktop motherboard design, high-density VRM development, and industrial embedded computing platforms requiring stable component supply and long-term lifecycle support.
Supply support for ISL6377IRZ 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, emphasizing reliability, automotive-grade quality, and industrial longevity.
The ISL6377IRZ belongs to Intersil's VR12.x/VR13.x-compliant multiphase controller family, engineered specifically for AMD Fusion CPU/GPU core power delivery with SVI 2.0 interoperability and thermal-aware phase management.
FAQ
What is the operating temperature range for the ISL6377IRZ?
The ISL6377IRZ is rated for –40°C to +85°C ambient temperature operation, matching the industrial temperature grade indicated by the "IRZ" suffix. This range supports reliable deployment in consumer desktop PCs and thermally demanding embedded systems where airflow may be limited. The device's thermal monitor circuitry (NTC/NTC_NB) remains fully functional across this entire range, enabling robust thermal protection for both Core and Northbridge VR domains in the ISL6377IRZ.
Does the ISL6377IRZ support both DCR and resistor-based current sensing?
Yes, the ISL6377IRZ supports both lossless inductor DCR current sensing and precision resistor current sensing on both the Core and Northbridge VR outputs. For DCR sensing, it uses internal transconductance amplifiers (ISUMP/ISUMN and ISUMP_NB/ISUMN_NB) with single-NTC compensation. For resistor sensing, it accepts direct voltage feedback from external sense resistors. This dual-method flexibility allows designers to optimize for cost (DCR) or accuracy (resistor) without changing the ISL6377IRZ controller or layout.
How does the R3™ modulator in the ISL6377IRZ improve transient response?
The R3™ modulator in the ISL6377IRZ dynamically adjusts switching frequency during load transients by modulating the ripple capacitor discharge rate based on output voltage error. Unlike fixed-frequency PWM, this enables faster recovery from step-load changes - typically sub-10µs settling - while maintaining high efficiency at light loads. This behavior is intrinsic to the ISL6377IRZ's analog control loop and requires no firmware tuning, delivering consistent transient performance across the full ISL6377IRZ operating range.
Can the ISL6377IRZ be configured for different phase counts on Core and Northbridge VRs?
Yes, the ISL6377IRZ supports independent phase configuration: Core VR can be set to 1-, 2-, 3-, or 4-phase operation via ISEN1–ISEN4 pin strapping or SVI 2.0 commands, while Northbridge VR supports 1- or 2-phase modes via ISEN1_NB/ISEN2_NB. The FCCM_NB pin further configures the floating driver (UGATEX/LGATEX) for either Core Phase 3 or NB Phase 1. This flexibility allows optimal phase allocation per rail in the ISL6377IRZ without hardware redesign.
What is the purpose of the SVT pin on the ISL6377IRZ?
SVT (Serial VID Telemetry) is an output pin on the ISL6377IRZ that transmits real-time telemetry data - including output voltage, current, and temperature - back to the AMD CPU over the SVI 2.0 bus. It also signals completion of VID-on-the-fly transitions. This bidirectional capability enables closed-loop CPU power management, dynamic thermal throttling, and platform-level power state coordination - all required for AMD Fusion platform certification and fully implemented in the ISL6377IRZ.
ISL6377IRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- Robust Ripple Regulator™ (R3)
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Controller, AMD Fusion™ CPU GPU
- Voltage - Input:
- 10V ~ 12.6V
- Number of Outputs:
- 2
- Voltage - Output:
- 0.5V ~ 1.55V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-QFN (6x6)
ISL6377IRZ FAQ
1.How can I place an order for ISL6377IRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6377IRZ 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 ISL6377IRZ reliable?
The price and inventory of ISL6377IRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6377IRZ is usually 5 days.
3.What payment methods are accepted for ISL6377IRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6377IRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6377IRZ?
ISL6377IRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6377IRZ 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 ISL6377IRZ?
For technical support, including ISL6377IRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6377IRZ requirements.
6.How does Aetrix verify that ISL6377IRZ is sourced from the original manufacturer or authorized distributors?
All ISL6377IRZ 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 ISL6377IRZ meets industry standards.
7.What is the process for return or replacement of ISL6377IRZ?
All ISL6377IRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6377IRZ, 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 ISL6377IRZ part is unused and in its original packaging.
Return procedure for ISL6377IRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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