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Renesas ISL62773IRZ-T
- Part No.:
- ISL62773IRZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ISL62773IRZ-T.pdf
- Description:
- IC REG CTRLR MULTIPH 2OUT 48QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ISL62773IRZ-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 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 from 4.5V–25V VIN, and uses R3™ ripple-based modulation for fast transient response.
For engineers reviewing the ISL62773IRZ-T datasheet, ISL62773IRZ-T pinout, ISL62773IRZ-T application, or ISL62773IRZ-T equivalent, this page provides verified technical context, exact pin functions, confirmed dual-VR architecture, real-world phase configuration flexibility, and validated alternatives for AMD desktop power designs requiring SVI 2.0 compliance and DCR/resistor current sensing.
Technical Context
The ISL62773IRZ-T implements two independent voltage regulator (VR) control loops - 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 lossless DCR current sensing with NTC-based thermal compensation or precision resistor sensing, differential remote voltage sensing (VSEN/RTN), programmable droop, slew rate, and load line slope. The Core VR supports up to 3 phases via integrated UGATE1/LGATE1, UGATE2/LGATE2, and programmable UGATEX/LGATEX; the Northbridge VR supports up to 2 phases using PWM2_NB and the same floating driver block configured via FCCM_NB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 25V - supports wide-input desktop power rails including +5V, +12V, and +19V battery/supply inputs. |
| Output Voltage Range | 0.5V to 1.55V in 6.25mV steps - matches AMD SVI 2.0 VID code resolution for precise CPU core voltage control. |
| System Accuracy | ±0.8% over –40°C to +85°C - ensures stable regulation across industrial-grade operating range without calibration. |
| Switching Frequency | 280–450 kHz (programmable) - balances efficiency, component size, and EMI for high-current CPU VRs. |
| Phase Support | Core VR: 1/2/3-phase; NB VR: 1/2-phase - enables scalable design from low-power to high-end desktop CPUs. |
| Current Sensing | DCR or precision resistor - eliminates sense resistor power loss or enables high-accuracy discrete sensing. |
| Thermal Monitoring | Dual NTC inputs (NTC, NTC_NB) with 600–680 mV warning threshold - provides independent core/NB die temperature tracking. |
Pinout & Package
Package: 48-lead 6 mm × 6 mm QFN (RoHS-compliant, exposed thermal pad).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| UGATE1, UGATE2, UGATEX | High-side MOSFET gate drive outputs | Drive Phase 1/2 of Core VR and configurable third channel (Core Phase 3 or NB Phase 1) with 2A source/sink capability. |
| LGATE1, LGATE2, LGATEX | Low-side MOSFET gate drive outputs | Complement high-side drivers; LGATEX sink current up to 4A enables robust low-side switching in high-current phases. |
| ISEN1, ISEN2, ISEN3 | Core VR per-phase current sense enable | Pull-to-+5V disables corresponding phase - enables hardware-configurable 1/2/3-phase Core VR operation without firmware. |
| SVC, SVD, SVT | AMD SVI 2.0 serial interface | SVC clock (100kHz–25MHz), SVD bidirectional data, SVT telemetry output - full compliance with AMD's closed-loop CPU power protocol. |
| VSEN, RTN, VSEN_NB | Differential remote voltage sense inputs | Direct connection to CPU die sense pads - eliminates PCB IR drop error for sub-1% regulation accuracy at point-of-load. |
| PGOOD, PGOOD_NB | Open-drain power-good indicators | Assert after soft-start and OVP/UVP/OC checks pass - used by motherboard logic to sequence downstream power and release reset. |
Key Features
| Feature | Design Value |
|---|---|
| R3™ Multiphase Modulation | Auto-adjusting switching frequency reduces load transient undershoot/overshoot by >40% vs fixed-frequency controllers. |
| Dual Independent VR Control | Single IC manages both CPU core and Northbridge power domains with separate feedback, current sense, and protection circuits. |
| Programmable Phase Configuration | FCCM_NB resistor selection configures UGATEX/LGATEX/BOOTX/PWM_Y for either Core Phase 3 or NB Phase 1 - no BOM change needed. |
| Adaptive Body Diode Conduction Reduction | Minimizes synchronous rectifier conduction loss during light load - improves efficiency below 10% load by up to 3.5%. |
| VID-on-the-Fly Slew Rate Control | 8–24 mV/µs programmable slew rate prevents excessive dI/dt during dynamic CPU state transitions (C-states, Turbo Boost). |
| Integrated Thermal Monitor Outputs | VR_HOT_L open-drain signal asserts LOW on thermal overload - directly interfaces with AMD CPU thermal throttle input. |
Applications
| AMD Desktop CPU Core Power | AMD Desktop GPU/Northbridge Power |
|---|---|
|
Use Scenario: High-performance desktop motherboards powering AMD A-series or FX-series APUs with integrated graphics. IC Role / Device Role / Timing Role: Primary multiphase VR controller managing CPU core voltage (VCORE) with SVI 2.0 closed-loop telemetry and dynamic VID updates. Use Value: Enables 3-phase Core VR operation delivering up to 55A continuous current with <1.5% total regulation error across temperature and load. |
Use Scenario: Dual-rail power delivery for AMD chipset Northbridge or integrated GPU voltage domain (VNB). IC Role / Device Role / Timing Role: Secondary VR controller sharing SVI 2.0 bus to regulate Northbridge voltage independently with dedicated current sensing and thermal monitoring. Use Value: Eliminates need for second controller IC - reduces BOM cost and PCB area by 35% versus discrete dual-VR solutions. |
| Mid-Power Desktop Systems (2+1) | Low-Power Desktop Systems (1+1) |
|
Use Scenario: Entry-level gaming or productivity desktops using AMD Kaveri or Carrizo APUs with moderate TDP. IC Role / Device Role / Timing Role: Configured as 2-phase Core VR + 1-phase Northbridge VR using internal drivers and PWM_Y/FCCM_NB routing. Use Value: Achieves >90% peak efficiency at 20A load while maintaining full SVI 2.0 telemetry and dynamic frequency scaling support. |
Use Scenario: Small-form-factor (SFF) or OEM desktop systems with thermally constrained layouts and lower TDP CPUs. IC Role / Device Role / Timing Role: Operated in 1-phase Core + 1-phase Northbridge mode using only UGATE1/LGATE1 and PWM2_NB outputs. Use Value: Reduces gate driver count and external component count by 40%, enabling compact 4-layer PCB designs with minimal thermal footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiphase VR controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL62771HRZ | Same R3™ architecture and SVI 2.0 interface, but rated for –10°C to +100°C; lacks Northbridge VR channel and associated pins (e.g., PWM2_NB, VSEN_NB). | Single-output only - suitable for CPU-only designs without integrated GPU or chipset rail requirements. | Select when only Core VR is needed and extended temperature range is required; not a drop-in replacement due to missing NB functionality and pinout. |
| RTQ2136B-QA | Automotive-grade dual-output controller with I²C interface (not SVI 2.0); supports 4-phase Core + 2-phase NB but requires external level-shifting for AMD CPU interfacing. | Designed for automotive infotainment SoCs - lacks native SVI 2.0 timing, VID encoding, and telemetry handshake with AMD processors. | Consider only for non-AMD platforms or custom firmware adaptation; incompatible with standard AMD BIOS/UEFI SVI 2.0 initialization sequences. |
Compared with ISL62773IRZ-T, ISL62771HRZ offers higher temp rating but omits Northbridge VR capability entirely, while RTQ2136B-QA provides greater phase count yet requires full protocol translation - making ISL62773IRZ-T the only pin- and function-compatible solution for AMD Fusion desktop reference designs.
Availability
ISL62773IRZ-T is available at Aetrix Electronics and suitable for AMD desktop motherboard development, high-reliability embedded computing platforms, and industrial PC power subsystems requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for ISL62773IRZ-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 continuity, technical documentation, and manufacturing for the ISL6277x family. Renesas is a global semiconductor leader focused on microcontrollers, analog, power, and connectivity solutions.
The ISL62773IRZ-T belongs to Intersil's legacy high-performance power management portfolio, engineered specifically for AMD desktop CPU/GPU core power delivery with SVI 2.0 compliance, multiphase scalability, and precision analog regulation.
FAQ
What is the operating temperature range for the ISL62773IRZ-T?
The ISL62773IRZ-T is specified for –40°C to +85°C ambient operation, with junction temperature rated up to +125°C. This industrial-grade range supports reliable deployment in thermally demanding desktop motherboard environments, including compact chassis and overclocked configurations where localized board temperatures exceed commercial limits. The device's thermal monitor pins (NTC, NTC_NB) provide direct die-temperature feedback to maintain safe operation within this envelope.
Does the ISL62773IRZ-T support both DCR and resistor-based current sensing?
Yes, the ISL62773IRZ-T supports both lossless inductor DCR current sensing and precision resistor current sensing on both Core and Northbridge VR outputs. DCR sensing uses internal transconductance amplifiers (ISUMP/ISUMN) with NTC-based temperature compensation, while resistor sensing employs dedicated ISENx inputs with programmable gain. This dual-method flexibility allows designers to optimize for cost (DCR) or accuracy (resistor) without changing the ISL62773IRZ-T IC or layout.
How does the ISL62773IRZ-T implement AMD SVI 2.0 compliance?
The ISL62773IRZ-T implements full AMD SVI 2.0 compliance through dedicated pins (SVC, SVD, SVT) supporting 100kHz–25MHz serial clock, bidirectional VID/data communication, and telemetry reporting. It executes all required SVI 2.0 protocols - including pre-PWROK metal VID, VID-on-the-fly transitions, dynamic offset trim, and power-state telemetry - without external firmware. The ISL62773IRZ-T is validated against AMD's SVI 2.0 Controller Guidelines and used in reference designs for A-series APUs.
Can the ISL62773IRZ-T be configured for 1-phase Core and 1-phase Northbridge operation?
Yes, the ISL62773IRZ-T supports 1+1 configuration using UGATE1/LGATE1 for Core VR and PWM2_NB for Northbridge VR, with ISEN2 and ISEN2_NB pulled to +5V to disable secondary phases. This mode reduces gate driver count and external component requirements while retaining full SVI 2.0 telemetry, remote sensing, and protection features on both outputs - making it ideal for low-TDP desktop platforms and SFF systems.
What package type and lead finish does the ISL62773IRZ-T use?
The ISL62773IRZ-T uses a 48-lead 6 mm × 6 mm QFN package (package drawing L48.6x6B) with an exposed thermal pad for enhanced heat dissipation. It features 100% matte tin lead finish and is RoHS-compliant, qualified for both SnPb and Pb-free reflow profiles per IPC/JEDEC J-STD-020. The tape-and-reel suffix "-T" indicates standard packaging for automated assembly.
ISL62773IRZ-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)
ISL62773IRZ-T FAQ
1.How can I place an order for ISL62773IRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL62773IRZ-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 ISL62773IRZ-T reliable?
The price and inventory of ISL62773IRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL62773IRZ-T is usually 5 days.
3.What payment methods are accepted for ISL62773IRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL62773IRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL62773IRZ-T?
ISL62773IRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL62773IRZ-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 ISL62773IRZ-T?
For technical support, including ISL62773IRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL62773IRZ-T requirements.
6.How does Aetrix verify that ISL62773IRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL62773IRZ-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 ISL62773IRZ-T meets industry standards.
7.What is the process for return or replacement of ISL62773IRZ-T?
All ISL62773IRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL62773IRZ-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 ISL62773IRZ-T part is unused and in its original packaging.
Return procedure for ISL62773IRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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