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Renesas ISL6373CRTZ-T
- Part No.:
- ISL6373CRTZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL6373CRTZ-T.pdf
- Description:
- IC REG CTRLR INTEL 1OUT 40TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,305
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Product details
Overview
ISL6373CRTZ-T from Intersil is a hybrid digital 4-phase PWM controller compliant with Intel VR12.5/VR12 specifications, designed to regulate microprocessor core or memory voltage rails. It delivers ±0.5% closed-loop system accuracy over load, line, and temperature; supports up to 2MHz per phase switching; implements EAPP modulation for fast transient response; and enables auto-phase shedding across 1–4 phases for light-to-full-load efficiency optimization in server and desktop CPU power delivery.
For engineers reviewing the ISL6373CRTZ-T datasheet, ISL6373CRTZ-T pinout, ISL6373CRTZ-T application, or ISL6373CRTZ-T equivalent, key selection considerations include VR12.5/VR12 compliance, SVID/SMBus/PMBus/I²C programmability, EAPP modulation architecture, droop control via FB/IMON current sensing, and PSI#-driven phase reduction (PSI1/PSI2/PSI3) for green-mode operation.
Technical Context
The ISL6373CRTZ-T implements Intersil's patented Enhanced Active Pulse Positioning (EAPP) modulation to achieve sub-100ns load-step response while maintaining linear control and evenly distributed PWM pulses across phases. It integrates precision current sensing via dedicated resistor or DCR-based feedback, with IMON pin reporting real-time load current to the CPU through the IOUT register.
Its hybrid digital architecture eliminates NVM and firmware, relying on SMBus/PMBus/I²C for configuration while remaining conflict-free with CPU SVID bus. Phase shedding is dynamically managed via PSI# signals-entering 1- or 2-phase mode in PSI1, single-phase with diode emulation in PSI2/PSI3-and fully restored upon de-assertion to sustain heavy-load transient performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Phases | Configurable 1–4-phase operation with phase doubler support for scalable high-current output. |
| Compliance | Fully compliant with Intel VR12.5 and VR12 specifications for core/memory voltage regulation. |
| Accuracy | ±0.5% closed-loop system accuracy across load, line, and temperature for tight VOUT regulation. |
| Switching Frequency | Up to 2MHz per phase, enabling compact magnetics and reduced output capacitance requirements. |
| Current Sensing | Differential sensing via precision resistor or inductor DCR, with integrated programmable gain for droop control and channel balancing. |
| Interface | SMBus/PMBus/I²C with SVID bus conflict-free design-enables full telemetry and VID programming without CPU bus interference. |
| Thermal Monitoring | TM pin interfaces with NTC thermistor; digitized internally for thermal compensation of current sense elements. |
Pinout & Package
ISL6373CRTZ-T is housed in a 40-pin QFN package (6mm × 6mm, 0.5mm pitch) with exposed thermal pad. Pin functions are defined per Intersil FN8350 Rev 0.00.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply rail | Primary power input for controller bias and gate drivers; supports wide input range for buck converter front-end. |
| VOUT_SENS+ / VOUT_SENS− | Differential remote sense inputs | Enable precise regulation at point-of-load by eliminating PCB trace IR drop errors between controller and CPU socket. |
| FB | Feedback reference node | Develops precision droop voltage via current-sense signal; connects to external resistor divider for VOUT setpoint and load-line programming. |
| IMON | Analog current monitor output | Provides continuous analog representation of total output current for CPU telemetry and protection logic. |
| PSI# | Power state indicator input | Accepts active-low signal from CPU to trigger automatic phase reduction (PSI1/PSI2/PSI3) and diode emulation for light-load efficiency. |
| SCL / SDA | I²C/SMBus interface pins | Support bidirectional communication for VID programming, telemetry readback (IOUT, VOUT, TEMP), and fault logging without requiring SVID bus access. |
| EN | Threshold-sensitive enable | Allows precise sequencing coordination with other rails via adjustable turn-on threshold (typically 0.9V). |
| TM | Thermistor monitoring input | Connects to NTC thermistor for real-time die temperature measurement and automatic current-sense offset compensation. |
Key Features
| Feature | Design Value |
|---|---|
| EAPP Modulation | Proprietary pulse positioning scheme delivering <100ns transient response while maintaining phase current balance and minimizing beat-frequency oscillation. |
| Auto Phase Shedding | Hardware-managed phase reduction (1–4 phases) triggered by PSI# signals-no firmware required-to maximize efficiency from light to full load without sacrificing transient capability. |
| Droop Control Architecture | Uses FB pin current injection from IMON path to generate accurate load-line voltage positioning, supporting Intel VR12.5/VR12 dynamic VID requirements. |
| SVID/SMBus Coexistence | Dedicated I²C/SMBus interface operates independently of CPU SVID bus-enabling simultaneous telemetry access and VID updates without bus contention or timing conflicts. |
| True Catastrophic Failure Protection (CFP) | Hardware-level detection of short-circuit, overvoltage, and thermal runaway conditions with immediate shutdown-bypassing software/firmware dependencies for safety-critical systems. |
Applications
| Server CPU Voltage Regulation | Desktop High-Performance CPU VRM |
|---|---|
Use Scenario: Regulating core voltage for dual-socket Xeon Scalable processors under dynamic workloads including AI inference and virtualization. IC Role / Device Role / Timing Role: Primary 4-phase PWM controller managing gate drive signals, current sensing, phase shedding, and SVID-compliant VID updates. Use Value: EAPP modulation ensures sub-100ns transient response to sudden load steps; auto-phase shedding maintains >90% efficiency at 10% load without compromising heavy-load regulation. | Use Scenario: Powering overclocked Core i9 processors in enthusiast desktop platforms with aggressive dynamic VID scaling and thermal throttling. IC Role / Device Role / Timing Role: Hybrid digital controller executing droop-based voltage positioning, PSI#-driven phase management, and real-time current telemetry via IMON/IOUT. Use Value: ±0.5% system accuracy and DCR-based current sensing enable stable overclocking headroom; diode emulation in PSI2 reduces idle power by 35% vs fixed-phase operation. |
| DDR4/DDR5 Memory VDDQ Regulation | Workstation GPU Core Rail Control |
Use Scenario: Delivering tightly regulated VDDQ for high-bandwidth DDR4/DDR5 modules in multi-channel memory subsystems. IC Role / Device Role / Timing Role: VR12.5-compliant 2-phase controller implementing differential remote sensing and programmable slew rate for Dynamic VID Compensation (DVC). Use Value: Differential sensing eliminates ground bounce errors across memory DIMMs; DVC ensures smooth VID transitions during memory frequency scaling without output voltage overshoot. | Use Scenario: Managing GPU core voltage in professional workstation graphics cards with variable TDP profiles and thermal capping. IC Role / Device Role / Timing Role: 4-phase controller coordinating with GPU's PMBus interface for real-time VOUT adjustment, temperature-compensated current limiting, and catastrophic failure shutdown. Use Value: Integrated thermal monitoring via TM pin enables dynamic current limit derating as GPU die temperature rises; CFP prevents damage during VRM component failure or solder joint fatigue. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-phase hybrid digital PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IR35201MTRPBF | Supports VR12/VR12.5 but uses different EAPM modulation; lacks integrated DCR temperature compensation; requires external NTC biasing. | Targeted at cost-sensitive server VRMs where thermal compensation granularity is less critical than in high-density compute blades. | Choose IR35201MTRPBF when BOM cost reduction is prioritized over integrated thermal compensation and PSI3-level phase control. |
| TPS53689RTAR | TI's 4-phase controller with D-CAP3 modulation; supports SVID only (no standalone SMBus); no PSI#-based ultra-low-power mode. | Better suited for client-platform VRMs where CPU SVID is primary interface and deep power-down modes are not required. | Choose TPS53689RTAR when SVID-only interface suffices and system-level power sequencing does not require independent PSI# handling. |
Compared with IR35201MTRPBF and TPS53689RTAR, the ISL6373CRTZ-T uniquely combines EAPP modulation for fastest transient response, full SVID/SMBus coexistence, PSI2/PSI3 diode emulation, and on-die thermal compensation-making it optimal for high-efficiency, high-reliability server and workstation CPU VRMs demanding both performance and green-mode operation.
Availability
ISL6373CRTZ-T is available at Aetrix Electronics and suitable for server motherboard design, high-end desktop VRM development, and workstation GPU power delivery requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL6373CRTZ-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
Intersil Corporation (now part of Renesas Electronics) designs high-performance analog and power management ICs for computing, communications, and industrial applications, operating under ISO9001 quality systems.
The ISL6373CRTZ-T belongs to Intersil's EAPP Hybrid Digital PWM Controller product line, engineered specifically for Intel VR12.5/VR12-compliant CPU and memory voltage regulation with emphasis on transient speed, light-load efficiency, and firmware-free programmability.
FAQ
What is the primary compliance standard supported by the ISL6373CRTZ-T?
The ISL6373CRTZ-T is fully compliant with Intel VR12.5 and VR12 specifications for microprocessor core and memory voltage regulation. It supports SerialVID programming, programmable IMAX/TMAX registers, and SVID bus operation-including conflict-free coexistence with CPU SVID traffic via its dedicated SMBus/PMBus/I²C interface. This ensures seamless integration into modern CPU power delivery architectures requiring strict voltage positioning and dynamic VID control.
How does the ISL6373CRTZ-T achieve fast transient response without firmware?
The ISL6373CRTZ-T achieves sub-100ns transient response using Intersil's patented Enhanced Active Pulse Positioning (EAPP) modulation-a hardware-based analog-digital hybrid technique that dynamically adjusts pulse position and width across phases without NVM or firmware. This eliminates boot-time delays and runtime overhead, enabling deterministic response to load steps while maintaining phase current balance and minimizing beat-frequency oscillation in multi-phase buck converters.
Does the ISL6373CRTZ-T support remote voltage sensing, and why is it important?
Yes, the ISL6373CRTZ-T supports true differential remote voltage sensing via VOUT_SENS+ and VOUT_SENS− pins. This eliminates voltage error caused by PCB trace resistance between the controller and CPU socket, ensuring ±0.5% closed-loop accuracy at the point-of-load. In high-current CPU VRMs, even 10mΩ of trace resistance can cause >10mV regulation error-remote sensing corrects this in real time, improving both regulation stability and overvoltage protection fidelity.
What protection features are integrated into the ISL6373CRTZ-T?
The ISL6373CRTZ-T integrates True Catastrophic Failure Protection (CFP), average overcurrent protection, individual phase current limiting, output voltage open-sensing protection, and precision overcurrent detection on the IMON pin. CFP provides hardware-level shutdown for short-circuit, overvoltage, and thermal runaway events-bypassing software dependencies. Current protection uses internal comparators with DCR/resistor sensing, enabling fast, accurate response without external components.
Can the ISL6373CRTZ-T operate with both resistor-based and DCR-based current sensing?
Yes, the ISL6373CRTZ-T supports both precision shunt resistor and inductor DCR-based current sensing. It includes integrated programmable gain stages and offset calibration to accommodate either method, enabling accurate droop programming, channel-current balancing, and real-time load telemetry via the IMON pin and IOUT register. DCR sensing reduces power loss and board space; resistor sensing offers higher accuracy at low currents-designers select based on system efficiency and precision trade-offs.
ISL6373CRTZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Controller, Intel VR12, VR12.5
- Voltage - Input:
- 4.75V ~ 5.25V
- Number of Outputs:
- 1
- Voltage - Output:
- 0.25V ~ 3.04V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-TQFN (5x5)
ISL6373CRTZ-T FAQ
1.How can I place an order for ISL6373CRTZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6373CRTZ-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 ISL6373CRTZ-T reliable?
The price and inventory of ISL6373CRTZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6373CRTZ-T is usually 5 days.
3.What payment methods are accepted for ISL6373CRTZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6373CRTZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6373CRTZ-T?
ISL6373CRTZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6373CRTZ-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 ISL6373CRTZ-T?
For technical support, including ISL6373CRTZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6373CRTZ-T requirements.
6.How does Aetrix verify that ISL6373CRTZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6373CRTZ-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 ISL6373CRTZ-T meets industry standards.
7.What is the process for return or replacement of ISL6373CRTZ-T?
All ISL6373CRTZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6373CRTZ-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 ISL6373CRTZ-T part is unused and in its original packaging.
Return procedure for ISL6373CRTZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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