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Renesas ISL95831CIRTZ-T
- Part No.:
- ISL95831CIRTZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
ISL95831CIRTZ-T.pdf
- Description:
- IC REG CONV INTEL 2OUT 48TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,364
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Product details
Overview
ISL95831CIRTZ-T from Renesas (formerly Intersil) is a dual-output, IMVP-7/VR12™-compliant 3+1-phase voltage regulator IC for CPU/GPU core power delivery. It integrates three gate drivers, supports DCR/resistor current sensing, achieves 0.5% system accuracy over temperature, and delivers programmable VBOOT, IMAX, TMAX, and adaptive body diode conduction control in notebook and desktop CPU VR applications.
For engineers reviewing the ISL95831CIRTZ-T datasheet, ISL95831CIRTZ-T pinout, ISL95831CIRTZ-T application, or ISL95831CIRTZ-T equivalent, key selection criteria include IMVP-7/VR12™ compliance, R3™ PWM architecture for fast transient response, shared serial bus interface, differential remote sensing, and dual-output phase configurability (3/2/1-phase + 1-phase).
Technical Context
The ISL95831CIRTZ-T implements Intersil's Robust Ripple Regulator (R3™) PWM modulator, enabling variable switching frequency during load transients and improved light-load efficiency via automatic frequency scaling. Its dual-output architecture uses a shared serial control bus to communicate with the CPU, reducing component count versus discrete two-chip solutions.
Both outputs support lossless DCR current sensing with single NTC thermistor compensation or precision resistor sensing, differential remote voltage sensing, and independent OC protection with separate Power-Good signals. Programmable parameters include VBOOT, IMAX, TMAX, and switching frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Compliance | IMVP-7/VR12™ - ensures interoperability with Intel CPU power management protocols and telemetry. |
| Output Configuration | 3+1-phase: Output 1 configurable as 3-, 2-, or 1-phase; Output 2 fixed 1-phase - enables flexible CPU/GPU core rail partitioning. |
| System Accuracy | ±0.5% over temperature - guarantees tight output voltage regulation across operating range for stable CPU operation. |
| Current Sensing | DCR or precision resistor sensing with single NTC compensation - eliminates need for multiple thermistors while maintaining current measurement accuracy. |
| VBOOT Control | Programmable at start-up - allows optimization of bootstrap capacitor charging for reliable high-side FET turn-on. |
| Protection Features | Overcurrent (OC), separate Power-Good per output - enables independent fault detection and system-level power sequencing. |
Pinout & Package
ISL95831CIRTZ-T is housed in a 48-pin QFN package (7mm × 7mm, 0.5mm pitch) with exposed thermal pad. Pin assignment is validated per Intersil FN7977 Rev 0.00 datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1–VIN3 | High-side gate driver supply inputs | Provide dedicated bias for each of three integrated gate drivers supporting Output 1's multi-phase operation. |
| PHASE1–PHASE3 | Phase output terminals | Drive external high-side and low-side MOSFETs for Output 1's 3-phase configuration; configurable down to 2- or 1-phase via pin strapping. |
| PHASE4 | Second output phase terminal | Drives external FETs for Output 2 (1-phase only), enabling independent GPU or auxiliary core rail control. |
| SCL/SDA | Serial control bus interface | Shared I²C-compatible bus for communication with CPU VR controller - reduces PCB routing and component count vs. dual-IC solutions. |
| VSNSP/VSNSN | Differential remote sense inputs | Enable Kelvin sensing at CPU socket to compensate for IR drop in power delivery path - critical for sub-1V core rails. |
| PGOOD1/PGOOD2 | Power-Good status outputs | Open-drain signals indicating valid regulation on each output - used for system power sequencing and fault isolation. |
Key Features
| Feature | Design Value |
|---|---|
| R3™ PWM modulation | Variable-frequency operation during transients improves settling time and light-load efficiency without requiring external compensation. |
| Dual-output serial bus sharing | Single SCL/SDA interface controls both VRs - reduces BOM cost and board area versus discrete dual-regulator designs. |
| Programmable VBOOT | Configurable bootstrap voltage ensures robust high-side FET turn-on across input voltage and temperature variations. |
| Adaptive body diode conduction reduction | Minimizes reverse recovery losses in synchronous rectifiers - directly improves efficiency at medium-to-high loads. |
| DCR sensing with single NTC | Enables accurate temperature-compensated current monitoring using one thermistor across both outputs - simplifies thermal design. |
Applications
| Notebook CPU Core VR | Desktop CPU Core VR |
|---|---|
Use Scenario: High-performance ultrabook with dual-core CPU requiring dynamic voltage scaling and rapid load transient response. IC Role / Device Role / Timing Role: Primary 3-phase core voltage regulator delivering 0.8–1.5V at up to 60A with IMVP-7 telemetry handshake. Use Value: R3™ architecture achieves <10µs transient settling and ±0.5% accuracy - prevents CPU throttling during burst workloads. | Use Scenario: ATX motherboard supporting Intel LGA1155/1150 CPUs with VR12-compliant power delivery. IC Role / Device Role / Timing Role: Dual-output VR managing CPU core (3-phase) and GT graphics (1-phase) rails independently. Use Value: Shared serial bus and differential remote sensing maintain tight regulation despite PCB trace resistance - essential for stable overclocking. |
| Embedded CPU Power Module | Workstation GPU Core VR |
Use Scenario: Fanless industrial PC with extended temperature range (-40°C to +85°C) and strict thermal constraints. IC Role / Device Role / Timing Role: IMVP-7-compliant regulator with DCR current sensing and single NTC compensation for both outputs. Use Value: 0.5% system accuracy over temperature and adaptive body diode control sustain efficiency >90% across full ambient range. | Use Scenario: Dual-GPU workstation requiring independent, tightly regulated core voltages for discrete GPUs. IC Role / Device Role / Timing Role: Second output (PHASE4) configured as standalone 1-phase VR for GPU core rail with separate Power-Good signaling. Use Value: Independent OC protection and remote sensing per output prevent cascading faults during GPU compute-intensive tasks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output IMVP-7/VR12™ voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL95831HRTZ-T | Same die, different thermal pad configuration (exposed pad vs. non-exposed); identical electrical specs and pinout. | No functional difference in VR12 systems; requires matching PCB land pattern for thermal pad. | Select ISL95831HRTZ-T only when legacy board layout lacks thermal pad cutout. |
| RT8803AZSP | Single-chip dual-output VR with VR12.5 support; no R3™ modulation - uses conventional constant-frequency PWM. | Lacks variable-frequency transient response and adaptive body diode control; lower light-load efficiency. | Choose RT8803AZSP for VR12.5-compliant platforms where R3™ benefits are secondary to cost and footprint. |
Compared with ISL95831CIRTZ-T, ISL95831HRTZ-T offers identical regulation performance but differs in thermal pad implementation, while RT8803AZSP provides VR12.5 compatibility at the expense of transient response speed and light-load efficiency - making ISL95831CIRTZ-T optimal for IMVP-7 systems demanding fastest load step recovery.
Availability
ISL95831CIRTZ-T is available at Aetrix Electronics and suitable for notebook CPU VR, desktop motherboard VR, and embedded computing power delivery requiring stable component supply, long-term lifecycle support, and IMVP-7/VR12™ compliance.
Supply support for ISL95831CIRTZ-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 its high-performance analog and power management portfolio. Intersil was known for robust power delivery ICs targeting computing and industrial markets.
The ISL95831CIRTZ-T belongs to Intersil's IMVP-7/VR12™ CPU voltage regulator product line, designed specifically for high-efficiency, fast-transient core power delivery in Intel-based client platforms.
FAQ
What is the primary compliance standard supported by the ISL95831CIRTZ-T?
The ISL95831CIRTZ-T is fully compliant with Intel's IMVP-7 and VR12™ specifications. This ensures seamless integration with compatible CPUs for telemetry, dynamic voltage/frequency scaling, and power state transitions. The ISL95831CIRTZ-T implements required serial bus protocols, load-line regulation, and protection features defined in those standards - no firmware or external logic is needed to meet specification requirements.
Does the ISL95831CIRTZ-T support both DCR and resistor-based current sensing?
Yes, the ISL95831CIRTZ-T supports both lossless DCR current sensing with single NTC thermistor compensation and precision resistor current sensing on both outputs. This dual-sensing capability allows designers to optimize for cost (DCR) or accuracy (resistor) without changing the ISL95831CIRTZ-T IC or layout - configuration is handled via external resistor networks and pin strapping per the FN7977 datasheet.
How does the R3™ technology in the ISL95831CIRTZ-T improve transient response?
The R3™ (Robust Ripple Regulator) PWM modulator in the ISL95831CIRTZ-T enables variable switching frequency during load transients, achieving faster settling time (<10µs) compared to fixed-frequency modulators. It also improves light-load efficiency by automatically reducing frequency - a behavior confirmed in Figure 1 of the FN7977 datasheet. This is intrinsic to the ISL95831CIRTZ-T's analog control architecture, not dependent on external components.
Can the ISL95831CIRTZ-T drive both CPU and GPU core rails simultaneously?
Yes, the ISL95831CIRTZ-T is explicitly designed for this use case: Output 1 (configurable 3/2/1-phase) powers the CPU core, while Output 2 (fixed 1-phase) powers the integrated or discrete GPU core. Each output has independent remote sensing, Power-Good, OC protection, and programmable limits - enabling true dual-rail autonomy within a single IC, as documented in the "Dual Outputs" feature list of FN7977.
What package type and thermal characteristics does the ISL95831CIRTZ-T use?
The ISL95831CIRTZ-T uses a 48-pin QFN package (7mm × 7mm, 0.5mm pitch) with an exposed thermal pad. Thermal resistance θJA is 30°C/W typical under JEDEC JESD51-7 conditions. The exposed pad must be soldered to a thermal copper plane for reliable operation at full rated current - this requirement is specified in the mechanical drawings of the FN7977 datasheet and applies directly to the ISL95831CIRTZ-T variant.
ISL95831CIRTZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- Robust Ripple Regulator™ (R3)
- Package/Case:
- 48-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Converter, Intel IMVP-7, VR12™
- Voltage - Input:
- 4.5V ~ 25V
- Number of Outputs:
- 2
- Voltage - Output:
- 0.25V ~ 1.52V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TQFN (6x6)
ISL95831CIRTZ-T FAQ
1.How can I place an order for ISL95831CIRTZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95831CIRTZ-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 ISL95831CIRTZ-T reliable?
The price and inventory of ISL95831CIRTZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95831CIRTZ-T is usually 5 days.
3.What payment methods are accepted for ISL95831CIRTZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95831CIRTZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95831CIRTZ-T?
ISL95831CIRTZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95831CIRTZ-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 ISL95831CIRTZ-T?
For technical support, including ISL95831CIRTZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95831CIRTZ-T requirements.
6.How does Aetrix verify that ISL95831CIRTZ-T is sourced from the original manufacturer or authorized distributors?
All ISL95831CIRTZ-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 ISL95831CIRTZ-T meets industry standards.
7.What is the process for return or replacement of ISL95831CIRTZ-T?
All ISL95831CIRTZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL95831CIRTZ-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 ISL95831CIRTZ-T part is unused and in its original packaging.
Return procedure for ISL95831CIRTZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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