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Renesas ISL95835IRZ
- Part No.:
- ISL95835IRZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL95835IRZ.pdf
- Description:
- IC REG CONV INTEL 2OUT 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,280
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Product details
Overview
ISL95835IRZ from Renesas (formerly Intersil) is a dual-output IMVP-7/VR12™ compliant voltage regulator IC for CPU and GPU core power delivery. It integrates three gate drivers, supports 3+1 phase configuration (VR1: 3/2/1-phase configurable; VR2: fixed 1-phase), delivers 0.5% system accuracy over temperature, and uses Robust Ripple Regulator (R3)™ PWM modulation for fast transient response and adaptive light-load efficiency.
For engineers reviewing the ISL95835IRZ datasheet, ISL95835IRZ pinout, ISL95835IRZ application, or ISL95835IRZ equivalent, key selection considerations include IMVP-7/VR12™ serial bus compliance, DCR/resistor current sensing support, differential remote sensing per output, programmable VBOOT, IMAX/TMAX, and independent Power-Good signaling for each VR.
Technical Context
The ISL95835IRZ implements two independent voltage regulator controllers sharing a single SMBus/I2C interface for CPU communication-reducing component count versus dual-chip solutions. VR1 supports 3-, 2-, or 1-phase operation using two integrated high-side/low-side gate drivers; VR2 uses one dedicated gate driver for 1-phase output.
Its R3™ PWM modulator enables variable switching frequency during load transients and automatic frequency scaling at light load to improve efficiency. Both outputs feature lossless DCR current sensing with single NTC thermistor compensation, differential remote voltage sense, and separate overcurrent (OC) protection with programmable IMAX and TMAX thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulator Type | Dual-output IMVP-7/VR12™ CPU core power controller with integrated gate drivers |
| Phase Configuration | VR1: configurable 3/2/1-phase; VR2: fixed 1-phase - enables flexible multi-core/GPU power partitioning |
| System Accuracy | ±0.5% over temperature - ensures tight VOUT regulation across CPU load and thermal conditions |
| Current Sensing | DCR-based (with single NTC compensation) or precision resistor - eliminates sense resistor power loss or enables high-accuracy measurement |
| Remote Sensing | Differential per output - rejects PCB IR drop to maintain accurate core voltage at point-of-load |
| Protection Features | Programmable OC (IMAX/TMAX), adaptive body diode conduction reduction, separate Power-Good - prevents damage and enables safe sequencing |
| Control Interface | SMBus/I2C serial bus - allows dynamic VID updates, telemetry readback, and fault reporting per IMVP-7/VR12™ spec |
Pinout & Package
ISL95835IRZ is housed in a 48-pin QFN package (7mm × 7mm, 0.5mm pitch) with exposed thermal pad. Pin functions are defined per Intersil FN7671 Rev 1.00 datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1, VIN2 | Input supply rails | Separate inputs for VR1 and VR2 power stages - enables independent input source routing or rail decoupling |
| PHASE1–PHASE3 | Gate drive outputs (VR1) | Three high-side/low-side driver outputs supporting 3-phase, 2-phase, or 1-phase VR1 configuration |
| PHASE4 | Gate drive output (VR2) | Dedicated high-side/low-side driver for 1-phase VR2 - isolates GPU/core power control paths |
| SMBCLK, SMBDAT | Serial bus interface | I2C/SMBus lines for VID programming, telemetry, and fault status per IMVP-7/VR12™ protocol |
| PGOOD1, PGOOD2 | Power-good indicators | Open-drain outputs signaling valid regulation per VR - enables independent enable/sequencing of CPU/GPU rails |
| VSNS1+, VSNS1−, VSNS2+, VSNS2− | Differential remote sense inputs | Four pins enabling Kelvin sensing for each VR - eliminates PCB trace resistance error at point-of-load |
Key Features
| Feature | Design Value |
|---|---|
| Robust Ripple Regulator (R3)™ PWM | Variable switching frequency during transients + automatic light-load frequency scaling - improves dynamic response and efficiency simultaneously |
| Configurable VR1 phase count | 3/2/1-phase via pin strapping or SMBus - adapts to CPU core count and power budget without hardware change |
| Single-NTC DCR temperature compensation | One thermistor calibrates DCR drift for both VRs - reduces BOM cost and layout complexity vs. per-rail sensing |
| Programmable VBOOT voltage | Adjustable bootstrap voltage at startup - ensures reliable high-side FET turn-on during cold boot or low-VIN conditions |
| Independent IMAX/TMAX programming | Per-output overcurrent threshold and thermal limit setting - enables asymmetric protection for CPU vs. GPU power stages |
Applications
| Laptop CPU Core Power | Desktop CPU Core Power |
|---|---|
Use Scenario: High-performance mobile computing requiring strict IMVP-7 compliance and thermal-aware power delivery. IC Role / Device Role / Timing Role: Dual-output VR controller managing CPU core and GT (graphics) voltage domains with independent sequencing and telemetry. Use Value: ±0.5% system accuracy and differential remote sensing ensure stable core voltage under dynamic load and board-level IR drop. | Use Scenario: Multi-core desktop processors demanding scalable phase allocation and robust transient response. IC Role / Device Role / Timing Role: Configurable 3+1 phase controller where VR1 powers CPU cores (3-phase) and VR2 powers integrated graphics (1-phase). Use Value: R3™ PWM delivers sub-10µs transient settling and adaptive frequency scaling - critical for burst workloads like gaming or rendering. |
| VR12™-Compliant Server CPU | High-End Gaming Laptop Platform |
Use Scenario: Enterprise-class x86 server CPUs requiring VR12™ serial bus telemetry and fault logging. IC Role / Device Role / Timing Role: IMVP-7/VR12™-compliant controller providing SMBus-based VID updates, temperature monitoring, and OC fault reporting. Use Value: Shared serial bus reduces interconnect count and enables real-time power state coordination between CPU and platform controller hub. | Use Scenario: Thin-and-light gaming laptops with constrained thermal envelope and aggressive power cycling. IC Role / Device Role / Timing Role: Dual VR managing CPU core and GPU core rails with independent Power-Good and programmable VBOOT for reliable cold-start. Use Value: Programmable IMAX/TMAX per output allows differentiated overcurrent protection - preventing GPU throttling during sustained loads while preserving CPU responsiveness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output CPU voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL95837IRZ | Fixed 1+1 phase configuration (VR1 = 1-phase, VR2 = 1-phase); no 3/2-phase capability | Targeted for lower-power dual-core CPUs or platforms where full 3-phase headroom is unnecessary | Select ISL95837IRZ when phase flexibility is not required and BOM simplification is prioritized |
| RT8803AZQW | Single-chip 3+1 phase VR controller with integrated MOSFET drivers; supports Intel VR13/VR13.0 spec | Designed for newer platforms requiring VR13 compliance and higher integration density | Choose RT8803AZQW for VR13-compliant designs needing higher integration and updated protocol support |
Compared with ISL95835IRZ, ISL95837IRZ offers reduced phase flexibility but simpler configuration for entry-level dual-rail systems, while RT8803AZQW provides VR13 compliance and tighter integration at the cost of IMVP-7/VR12™ backward compatibility.
Availability
ISL95835IRZ is available at Aetrix Electronics and suitable for laptop CPU core power, desktop CPU core power, and VR12™-compliant server CPU applications requiring stable component supply and long-term industrial availability.
Supply support for ISL95835IRZ 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 Corporation acquired Intersil in 2017 and maintains its high-performance analog and power management portfolio for computing, industrial, and automotive markets.
The ISL95835IRZ belongs to Intersil's IMVP-7/VR12™-compliant CPU voltage regulator product line, engineered specifically for efficient, accurate, and standards-compliant core power delivery in high-performance client and server platforms.
FAQ
What is the primary function of the ISL95835IRZ in a CPU power delivery system?
The ISL95835IRZ serves as a dual-output voltage regulator controller that manages core power for both CPU and GPU domains in IMVP-7/VR12™-compliant systems. It integrates three gate drivers to support configurable 3+1 phase operation, implements R3™ PWM for fast transient response, and provides differential remote sensing, programmable protection thresholds, and SMBus-based telemetry - all essential for modern high-efficiency CPU power delivery. The ISL95835IRZ enables precise, adaptive, and standards-compliant regulation across varying thermal and load conditions.
Does the ISL95835IRZ support DCR current sensing with temperature compensation?
Yes, the ISL95835IRZ supports lossless inductor DCR current sensing for both outputs, with built-in compensation using a single NTC thermistor to correct for copper temperature drift. This eliminates the need for discrete current-sense resistors and associated power losses while maintaining accuracy across operating temperature ranges. The ISL95835IRZ also supports precision resistor-based current sensing as an alternative method, giving designers flexibility based on accuracy, cost, and thermal constraints.
How does the ISL95835IRZ implement phase configuration flexibility?
The ISL95835IRZ allows VR1 to be configured as 3-phase, 2-phase, or 1-phase via pin strapping or SMBus commands, using two integrated gate drivers. VR2 remains fixed at 1-phase with its own dedicated gate driver (PHASE4). This architecture enables dynamic adaptation to different CPU core counts and power requirements without changing the IC or PCB layout. The ISL95835IRZ thus delivers scalable power delivery within a single footprint - ideal for platform reuse across performance tiers.
What serial interface does the ISL95835IRZ use for CPU communication?
The ISL95835IRZ uses a standard SMBus/I2C-compatible serial interface (SMBCLK and SMBDAT pins) to communicate with the CPU according to IMVP-7/VR12™ specifications. This interface supports dynamic VID updates, real-time telemetry readback (voltage, current, temperature), and fault status reporting. The ISL95835IRZ shares this bus between both VR outputs, reducing signal count and board area compared to dual-controller implementations - a key advantage in space-constrained client platforms.
Is the ISL95835IRZ pin-compatible with the ISL95837IRZ?
No, the ISL95835IRZ is not pin-compatible with the ISL95837IRZ. Although both share the same 48-pin QFN package and many signal assignments, the ISL95837IRZ repurposes certain pins (e.g., PHASE1–PHASE3) to support its fixed 1+1 phase architecture, altering functional pin mapping. Designers must consult the respective datasheets - FN7671 for ISL95835IRZ and FN7672 for ISL95837IRZ - before substitution. The ISL95835IRZ requires careful validation if replacing another variant due to differing phase-control logic and pin behavior.
ISL95835IRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- Robust Ripple Regulator™ (R3)
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Converter, Intel IMVP-7, VR12™
- Voltage - Input:
- 4.5V ~ 5.5V
- Number of Outputs:
- 2
- Voltage - Output:
- Up to 1.52V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (5x5)
ISL95835IRZ FAQ
1.How can I place an order for ISL95835IRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95835IRZ 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 ISL95835IRZ reliable?
The price and inventory of ISL95835IRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95835IRZ is usually 5 days.
3.What payment methods are accepted for ISL95835IRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95835IRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95835IRZ?
ISL95835IRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95835IRZ 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 ISL95835IRZ?
For technical support, including ISL95835IRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95835IRZ requirements.
6.How does Aetrix verify that ISL95835IRZ is sourced from the original manufacturer or authorized distributors?
All ISL95835IRZ 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 ISL95835IRZ meets industry standards.
7.What is the process for return or replacement of ISL95835IRZ?
All ISL95835IRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL95835IRZ, 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 ISL95835IRZ part is unused and in its original packaging.
Return procedure for ISL95835IRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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