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Renesas ISL6377IRZ-T
- Part No.:
- ISL6377IRZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ISL6377IRZ-T.pdf
- Description:
- IC REG CTRLR MULTIPH 2OUT 48QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ISL6377IRZ-T 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 for the Core VR (configurable 1–4 phases) and supports a second VR for Northbridge (1–2 phases), with DCR/resistor current sensing, differential remote voltage sense, and R3™ adaptive-frequency modulation. It delivers precision regulation from 0.5V to 1.55V in 6.25mV steps across -40°C to +85°C ambient.
For engineers reviewing the ISL6377IRZ-T datasheet, ISL6377IRZ-T pinout, ISL6377IRZ-T application, or ISL6377IRZ-T equivalent, this page provides verified technical context on its dual-VR architecture, SVI 2.0 protocol compliance, phase configuration flexibility, R3™ transient response behavior, and thermal monitoring implementation - all critical for AMD platform power design validation and BOM selection.
Technical Context
The ISL6377IRZ-T implements two independent voltage regulators on a single die: a primary Core VR supporting up to four phases and a secondary Northbridge VR supporting one or two phases. Both VRs share a common SVI 2.0 serial bus (SVC/SVD/SVT) for VID programming and telemetry, enabling coordinated voltage scaling and reduced board area versus discrete controllers.
Its R3™ modulator dynamically adjusts switching frequency during load transients to accelerate settling time while maintaining high light-load efficiency. Phase balancing uses real-time ISENx inputs and internal transconductance amplifiers (ISUMP/ISUMN), and both outputs support programmable droop, slew rate (8–24 mV/µs), and load-line slope trim via external resistors and NTC thermistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 0.5V to 1.55V in 6.25mV steps - enables precise VID-based CPU core voltage targeting per AMD SVI 2.0 specification. |
| System Accuracy | ±0.8% over temperature (-40°C to +85°C) - ensures stable core voltage regulation under thermal stress without recalibration. |
| Switching Frequency | 280–450 kHz programmable - balances EMI control, inductor size, and transient response for desktop VR applications. |
| Core VR Phases | Configurable 1-, 2-, 3-, or 4-phase operation - supports scalable power delivery from mid- to high-end AMD Fusion CPUs. |
| Northbridge VR Phases | Configurable 1- or 2-phase operation - provides dedicated, synchronized power for integrated GPU/NB logic. |
| Current Sensing | DCR-based (lossless) or precision resistor sensing - eliminates sense resistor power loss or enables high-accuracy current monitoring. |
| Thermal Monitoring | Dual NTC inputs (NTC, NTC_NB) with 600–680 mV warning threshold - enables independent core and Northbridge thermal throttling per AMD guidelines. |
Pinout & Package
ISL6377IRZ-T is housed in a RoHS-compliant, lead-free 48-lead 6×6 mm QFN package with exposed thermal pad (L48.6x6B). The package supports high-current gate drive and efficient heat dissipation in compact desktop VR layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| UGATE1–UGATE2, UGATEX | High-side MOSFET gate driver outputs | Drive gates of upper FETs for Core Phases 1–2 and configurable Phase 3/Core/NB - each rated for 2A source/sink with <30 ns dead time. |
| LGATE1–LGATE2, LGATEX | Low-side MOSFET gate driver outputs | Drive gates of lower FETs for same phases - LGATE sink current up to 4A enables fast synchronous rectification. |
| ISEN1–ISEN4, ISEN1_NB–ISEN2_NB | Per-phase current sense inputs | Enable phase enable/disable (tie to +5V) and real-time current monitoring - direct interface to DCR networks or sense resistors. |
| SVC, SVD, SVT | SVI 2.0 serial interface pins | SVC = clock (100 kHz–25 MHz), SVD = bidirectional data, SVT = telemetry output - implement full AMD-defined VID-on-the-fly and thermal reporting. |
| VSEN / VSEN_NB | Differential remote voltage sense inputs | Connect directly to CPU die +sense pads; RTN serves as common return - eliminates PCB IR drop errors for tight regulation. |
| PGOOD / PGOOD_NB | Open-drain power-good indicators | Assert after soft-start and OVP/UVP checks pass - required by AMD for system power sequencing and BIOS handoff. |
Key Features
| Feature | Design Value |
|---|---|
| R3™ Adaptive Modulation | Automatically increases switching frequency during load steps to reduce output voltage deviation - improves transient response without increasing static losses. |
| Dual Independent VRs | Single-chip integration of Core and Northbridge regulators with shared SVI 2.0 bus - reduces component count, layout area, and inter-VR timing skew. |
| Programmable VID Slew Rate | 8–24 mV/µs adjustment via FCCM_NB resistor - prevents excessive di/dt during dynamic voltage transitions and meets AMD slew-rate compliance limits. |
| DCR Temperature Compensation | Single NTC thermistor per VR (NTC, NTC_NB) compensates inductor DCR drift - maintains accurate current sensing across -40°C to +85°C ambient. |
| Phase Current Balancing | Hardware-based balancing using ISUMP/ISUMN summing nodes - achieves <9 mV inter-phase current imbalance without software intervention. |
| Telemetry & Thermal Protection | IMON/IMON_NB analog current monitors + VR_HOT_L open-drain thermal alert - enables real-time power telemetry and hardware-level thermal shutdown coordination with CPU. |
Applications
| AMD Desktop CPU Core Power | AMD Integrated GPU (Northbridge) Power |
|---|---|
|
Use Scenario: High-efficiency, multi-phase VR for AMD Fusion A-series APUs in mainstream desktop motherboards. IC Role / Device Role / Timing Role: Dual-VR PWM controller managing core voltage (VCORE) and Northbridge voltage (VNB) with synchronized SVI 2.0 updates. Use Value: Enables precise 0.5V–1.55V regulation with ±0.8% accuracy and adaptive R3™ frequency scaling - meeting AMD's dynamic voltage/frequency scaling (DVFS) requirements. |
Use Scenario: Dedicated low-noise, fast-transient power delivery for integrated Radeon graphics cores in Fusion platforms. IC Role / Device Role / Timing Role: Secondary VR channel configured for 1- or 2-phase operation, sharing SVI 2.0 bus and thermal monitoring with Core VR. Use Value: Provides independent load-line control and telemetry for GPU voltage domain - improving graphics performance stability under variable workloads. |
| Desktop Motherboard VRM Design | AMD Platform Power Validation |
|
Use Scenario: Compact, high-density VRM implementation on ATX/mATX boards with space-constrained CPU socket areas. IC Role / Device Role / Timing Role: Single-package solution replacing two discrete controllers and six gate drivers - reducing BOM count and PCB layer count. Use Value: 48-pin 6×6 mm QFN package with exposed thermal pad enables >30 A total output capability in <1 cm² footprint - simplifying thermal design. |
Use Scenario: Reference design verification for AMD SVI 2.0 compliance, including VID-on-the-fly, telemetry reporting, and thermal fault signaling. IC Role / Device Role / Timing Role: Hardware-enforced SVI 2.0 protocol stack with PWROK synchronization, VR_HOT_L assertion, and SVT telemetry output. Use Value: Eliminates need for external protocol translators or firmware patches - accelerates platform qualification and BIOS development cycles. |
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 |
|---|---|---|---|
| ISL6376IRZ-T | Single-output (Core-only) version; no Northbridge VR channel or NB-specific pins (e.g., PWM2_NB, ISEN1_NB). | Only suitable for platforms requiring Core VR only - cannot replace ISL6377IRZ-T where Northbridge power is integrated. | Select when AMD platform uses discrete Northbridge or simplified power architecture without NB VR requirements. |
| RT8803AGQW | Single-core VR controller with SVI 2.0 support; lacks dual-VR architecture, NB-specific telemetry, and programmable floating driver (UGATEX/LGATEX). | Designed for entry-level AMD platforms with fixed 2-phase Core VR only - no Northbridge support or DCR temperature compensation. | Use for cost-sensitive designs where Northbridge power is handled externally or omitted entirely. |
Compared with ISL6377IRZ-T, ISL6376IRZ-T removes Northbridge functionality but retains identical Core VR specs and pin compatibility for that channel, while RT8803AGQW offers SVI 2.0 compliance at lower integration - making both viable only in non-dual-VR use cases where ISL6377IRZ-T's full feature set is unnecessary.
Availability
ISL6377IRZ-T is available at Aetrix Electronics and suitable for AMD desktop motherboard design, CPU/GPU core power delivery, and high-reliability embedded computing applications requiring stable component supply and long-term lifecycle support.
Supply support for ISL6377IRZ-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 continues to support its high-performance analog and power management portfolio, including multiphase VR controllers for computing platforms.
The ISL6377IRZ-T belongs to Renesas' AMD-optimized VR controller product line, engineered specifically for Fusion-class desktop CPUs requiring dual-domain SVI 2.0 compliance, adaptive modulation, and thermal-aware power delivery.
FAQ
What is the operating temperature range for the ISL6377IRZ-T?
The ISL6377IRZ-T is rated for an industrial ambient temperature range of -40°C to +85°C, with a maximum junction temperature of +125°C. This range aligns with AMD SVI 2.0 platform requirements and supports reliable operation in thermally demanding desktop motherboard environments where CPU VRMs experience significant self-heating and ambient airflow variation. The ISL6377IRZ-T maintains ±0.8% system accuracy across this full range.
How does the ISL6377IRZ-T implement AMD SVI 2.0 communication?
The ISL6377IRZ-T implements AMD SVI 2.0 via three dedicated pins: SVC (serial clock, 100 kHz–25 MHz), SVD (bidirectional data), and SVT (telemetry output). It supports full VID-on-the-fly updates, thermal reporting, and power-state coordination per AMD specification. The ISL6377IRZ-T requires PWROK assertion before enabling the SVI bus and uses SVT to signal VID transition completion - all verified in the FN8336 datasheet timing diagrams.
Can the ISL6377IRZ-T support both DCR and resistor current sensing simultaneously?
No - the ISL6377IRZ-T supports either DCR-based or resistor-based current sensing per VR channel, but not both simultaneously on the same output. Each VR (Core and Northbridge) uses its own ISENx inputs and ISUMP/ISUMN summing nodes, and the sensing method is selected at design time via external network configuration. The ISL6377IRZ-T datasheet provides separate design guidelines for DCR networks (page 27) and resistor networks (page 29).
What is the purpose of the FCCM_NB pin on the ISL6377IRZ-T?
The FCCM_NB pin on the ISL6377IRZ-T serves a dual function: it configures the floating driver (UGATEX/LGATEX) for either Core Phase 3 or Northbridge Phase 1, and sets the VID slew rate for both VRs via an external resistor to GND. Its voltage level also controls diode emulation mode for the associated driver. This pin is essential for flexible phase allocation and ensuring compliant voltage transition timing per AMD SVI 2.0 specifications.
Does the ISL6377IRZ-T include hardware-based overcurrent protection?
Yes - the ISL6377IRZ-T features multiple hardware OCP mechanisms: way-overcurrent (WOC) detection using IMONx current thresholds (15 µA typical), voltage-based OCP on ISENx inputs (1.485–1.535 V), and current imbalance detection (<9 mV difference between phases). All protections trigger within microseconds and assert PGOOD deassertion or VR_HOT_L - no firmware or external circuitry required. These are fully documented in the FN8336 Electrical Specifications table (page 11).
ISL6377IRZ-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:
- Active
- 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-T FAQ
1.How can I place an order for ISL6377IRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6377IRZ-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 ISL6377IRZ-T reliable?
The price and inventory of ISL6377IRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6377IRZ-T is usually 5 days.
3.What payment methods are accepted for ISL6377IRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6377IRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6377IRZ-T?
ISL6377IRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6377IRZ-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 ISL6377IRZ-T?
For technical support, including ISL6377IRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6377IRZ-T requirements.
6.How does Aetrix verify that ISL6377IRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6377IRZ-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 ISL6377IRZ-T meets industry standards.
7.What is the process for return or replacement of ISL6377IRZ-T?
All ISL6377IRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6377IRZ-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 ISL6377IRZ-T part is unused and in its original packaging.
Return procedure for ISL6377IRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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